Filters¶
These classes hold methods to apply general filters to any data type.
By inherritting these classes into the wrapped VTK data structures, a user can easily apply common filters in an intuitive manner.
Example
>>> import pyvista
>>> from pyvista import examples
>>> dataset = examples.load_uniform()
>>> # Threshold
>>> thresh = dataset.threshold([100, 500])
>>> # Slice
>>> slc = dataset.slice()
>>> # Clip
>>> clp = dataset.clip(invert=True)
>>> # Contour
>>> iso = dataset.contour()
Dataset Filters¶
The pyvista.DataSetFilters
is inherited by pyvista.Common
making
all the following filters available as callable methods directly from any
PyVista dataset.
Methods

Generate points at the center of the cells in this dataset. 

Transform cell data into point data. 

Clip a dataset by a plane by specifying the origin and normal. 

Clip a dataset by a bounding box defined by the bounds. 

Clip any mesh type using a 

Compute a function of (geometric) quality for each cell of a mesh. 

Compute sizes for 1D (length), 2D (area) and 3D (volume) cells. 

Compute per cell gradient of point/cell scalar field. 

Compute the implicit distance from the points to a surface. 

Find and label connected bodies/volumes. 

Contour an input dataset by an array. 

Transform cell data into point data. 

Return a decimated version of a triangulation of the boundary. 

Construct a 3D Delaunay triangulation of the mesh. 

Generate scalar values on a dataset. 

Return a subset of the grid. 

Extract edges from the surface of the mesh. 

Extract the outer surface of a volume or structured grid dataset as PolyData. 

Extract largest connected set in mesh. 

Return a subset of the grid (with cells) that contains any of the given point indices. 

Return a subset of the grid (with cells) that contains any of the given point indices. 

Extract surface mesh of the grid. 

Copy a geometric representation (called a glyph) to every point in the input dataset. 

Interpolate values onto this mesh from the point data of a given dataset. 

Join one or many other grids to this grid. 

Produce an outline of the full extent for the input dataset. 

Produce an outline of the corners for the input dataset. 

Sample a dataset along a high resolution line and plot. 

Transform point data into cell data. 

Transform point data into cell data. 

Resample array data from a passed mesh onto this mesh. 

Sample a dataset onto a line. 

Mark points as to whether they are inside a closed surface. 

Slice a dataset by a plane at the specified origin and normal vector orientation. 

Create many slices of the input dataset along a specified axis. 

Slice a dataset using a polyline/spline as the path. 

Create three orthogonal slices through the dataset on the three cartesian planes. 

Find, label, and split connected bodies/volumes. 

Integrate a vector field to generate streamlines. 

Return the surface indices of a grid. 

Texture map this dataset to a user defined plane. 

Apply a 

Threshold the dataset by a percentage of its range on the active scalars array or as specified. 

Return an all triangle mesh. 

Warp the dataset’s points by a point data scalars array’s values. 

Extract all the internal/external edges of the dataset as PolyData. 

class
pyvista.
DataSetFilters
¶ A set of common filters that can be applied to any vtkDataSet.

cell_centers
(vertex=True)¶ Generate points at the center of the cells in this dataset.
These points can be used for placing glyphs / vectors.
 Parameters
vertex (bool) – Enable/disable the generation of vertex cells.

cell_data_to_point_data
(pass_cell_data=False)¶ Transform cell data into point data.
Point data are specified per node and cell data specified within cells. Optionally, the input point data can be passed through to the output.
The method of transformation is based on averaging the data values of all cells using a particular point. Optionally, the input cell data can be passed through to the output as well.
See also:
pyvista.DataSetFilters.point_data_to_cell_data()
 Parameters
pass_cell_data (bool) – If enabled, pass the input cell data through to the output

clip
(normal='x', origin=None, invert=True, value=0.0, inplace=False)¶ Clip a dataset by a plane by specifying the origin and normal.
If no parameters are given the clip will occur in the center of that dataset.
 Parameters
normal (tuple(float) or str) – Length 3 tuple for the normal vector direction. Can also be specified as a string conventional direction such as
'x'
for(1,0,0)
or'x'
for(1,0,0)
, etc.origin (tuple(float)) – The center
(x,y,z)
coordinate of the plane on which the clip occursinvert (bool) – Flag on whether to flip/invert the clip
value (float:) – Set the clipping value of the implicit function (if clipping with implicit function) or scalar value (if clipping with scalars). The default value is 0.0.
inplace (bool, optional) – Updates mesh inplace while returning nothing.

clip_box
(bounds=None, invert=True, factor=0.35)¶ Clip a dataset by a bounding box defined by the bounds.
If no bounds are given, a corner of the dataset bounds will be removed.
 Parameters
bounds (tuple(float)) – Length 6 iterable of floats: (xmin, xmax, ymin, ymax, zmin, zmax). Length 3 iterable of floats: distances from the min coordinate of of the input mesh. Single float value: uniform distance from the min coordinate. Length 12 iterable of length 3 iterable of floats: a plane collection (normal, center, …).
pyvista.PolyData
: if a poly mesh is passed that represents a box with 6 faces that all form a standard box, then planes will be extracted from the box to define the clipping region.invert (bool) – Flag on whether to flip/invert the clip
factor (float, optional) – If bounds are not given this is the factor along each axis to extract the default box.

clip_surface
(surface, invert=True, value=0.0, compute_distance=False)¶ Clip any mesh type using a
pyvista.PolyData
surface mesh.This will return a
pyvista.UnstructuredGrid
of the clipped mesh. Geometry of the input dataset will be preserved where possible  geometries near the clip intersection will be triangulated/tessellated. Parameters
surface (pyvista.PolyData) – The PolyData surface mesh to use as a clipping function. If this mesh is not PolyData, the external surface will be extracted.
invert (bool) – Flag on whether to flip/invert the clip
value (float:) – Set the clipping value of the implicit function (if clipping with implicit function) or scalar value (if clipping with scalars). The default value is 0.0.
compute_distance (bool, optional) – Compute the implicit distance from the mesh onto the input dataset. A new array called
'implicit_distance'
will be added to the output clipped mesh.

compute_cell_quality
(quality_measure='scaled_jacobian', null_value=1.0)¶ Compute a function of (geometric) quality for each cell of a mesh.
The percell quality is added to the mesh’s cell data, in an array named “CellQuality”. Cell types not supported by this filter or undefined quality of supported cell types will have an entry of 1.
Defaults to computing the scaled jacobian.
Options for cell quality measure:
'area'
'aspect_beta'
'aspect_frobenius'
'aspect_gamma'
'aspect_ratio'
'collapse_ratio'
'condition'
'diagonal'
'dimension'
'distortion'
'jacobian'
'max_angle'
'max_aspect_frobenius'
'max_edge_ratio'
'med_aspect_frobenius'
'min_angle'
'oddy'
'radius_ratio'
'relative_size_squared'
'scaled_jacobian'
'shape'
'shape_and_size'
'shear'
'shear_and_size'
'skew'
'stretch'
'taper'
'volume'
'warpage'
 Parameters
quality_measure (str) – The cell quality measure to use
null_value (float) – Float value for undefined quality. Undefined quality are qualities that could be addressed by this filter but is not well defined for the particular geometry of cell in question, e.g. a volume query for a triangle. Undefined quality will always be undefined. The default value is 1.

compute_cell_sizes
(length=True, area=True, volume=True)¶ Compute sizes for 1D (length), 2D (area) and 3D (volume) cells.
 Parameters
length (bool) – Specify whether or not to compute the length of 1D cells.
area (bool) – Specify whether or not to compute the area of 2D cells.
volume (bool) – Specify whether or not to compute the volume of 3D cells.

compute_gradient
(scalars=None, gradient_name='gradient', preference='point')¶ Compute per cell gradient of point/cell scalar field.
 Parameters
scalars (str) – String name of the scalars array to use when computing gradient.
gradient_name (str, optional) – The name of the output array of the computed gradient.

compute_implicit_distance
(surface, inplace=False)¶ Compute the implicit distance from the points to a surface.
This filter will comput the implicit distance from all of the nodes of this mesh to a given surface. This distance will be added as a point array called
'implicit_distance'
. Parameters
surface (pyvista.Common) – The surface used to compute the distance
inplace (bool) – If True, a new scalar array will be added to the
point_arrays
of this mesh. Otherwise a copy of this mesh is returned with that scalar field.

connectivity
(largest=False)¶ Find and label connected bodies/volumes.
This adds an ID array to the point and cell data to distinguish separate connected bodies. This applies a
vtkConnectivityFilter
filter which extracts cells that share common points and/or meet other connectivity criterion. (Cells that share vertices and meet other connectivity criterion such as scalar range are known as a region.) Parameters
largest (bool) – Extract the largest connected part of the mesh.

contour
(isosurfaces=10, scalars=None, compute_normals=False, compute_gradients=False, compute_scalars=True, rng=None, preference='point', method='contour')¶ Contour an input dataset by an array.
isosurfaces
can be an integer specifying the number of isosurfaces in the data range or an iterable set of values for explicitly setting the isosurfaces. Parameters
isosurfaces (int or iterable) – Number of isosurfaces to compute across valid data range or an iterable of float values to explicitly use as the isosurfaces.
scalars (str, optional) – Name of scalars to threshold on. Defaults to currently active scalars.
compute_normals (bool, optional) –
compute_gradients (bool, optional) – Desc
compute_scalars (bool, optional) – Preserves the scalar values that are being contoured
rng (tuple(float), optional) – If an integer number of isosurfaces is specified, this is the range over which to generate contours. Default is the scalars arrays’ full data range.
preference (str, optional) – When scalars is specified, this is the preferred array type to search for in the dataset. Must be either
'point'
or'cell'
method (str, optional) – Specify to choose which vtk filter is used to create the contour. Must be one of
'contour'
,'marching_cubes'
and'flying_edges'
. Defaults to'contour'
.

ctp
(pass_cell_data=False)¶ Transform cell data into point data.
Point data are specified per node and cell data specified within cells. Optionally, the input point data can be passed through to the output.
An alias/shortcut for
cell_data_to_point_data
.

decimate_boundary
(target_reduction=0.5)¶ Return a decimated version of a triangulation of the boundary.
Only the outer surface of the input dataset will be considered.
 Parameters
target_reduction (float) – Fraction of the original mesh to remove. Default is
0.5
TargetReduction is set to0.9
, this filter will try to reduce the data set to 10% of its original size and will remove 90% of the input triangles.

delaunay_3d
(alpha=0, tol=0.001, offset=2.5)¶ Construct a 3D Delaunay triangulation of the mesh.
This helps smooth out a rugged mesh.
 Parameters
alpha (float, optional) – Distance value to control output of this filter. For a nonzero alpha value, only verts, edges, faces, or tetra contained within the circumsphere (of radius alpha) will be output. Otherwise, only tetrahedra will be output.
tol (float, optional) – tolerance to control discarding of closely spaced points. This tolerance is specified as a fraction of the diagonal length of the bounding box of the points.
offset (float, optional) – multiplier to control the size of the initial, bounding Delaunay triangulation.

elevation
(low_point=None, high_point=None, scalar_range=None, preference='point', set_active=True)¶ Generate scalar values on a dataset.
The scalar values lie within a user specified range, and are generated by computing a projection of each dataset point onto a line. The line can be oriented arbitrarily. A typical example is to generate scalars based on elevation or height above a plane.
 Parameters
low_point (tuple(float), optional) – The low point of the projection line in 3D space. Default is bottom center of the dataset. Otherwise pass a length 3 tuple(float).
high_point (tuple(float), optional) – The high point of the projection line in 3D space. Default is top center of the dataset. Otherwise pass a length 3 tuple(float).
scalar_range (str or tuple(float), optional) – The scalar range to project to the low and high points on the line that will be mapped to the dataset. If None given, the values will be computed from the elevation (Z component) range between the high and low points. Min and max of a range can be given as a length 2 tuple(float). If
str
name of scalara array present in the dataset given, the valid range of that array will be used.preference (str, optional) – When an array name is specified for
scalar_range
, this is the preferred array type to search for in the dataset. Must be either ‘point’ or ‘cell’.set_active (bool, optional) – A boolean flag on whether or not to set the new Elevation scalar as the active scalars array on the output dataset.
Warning
This will create a scalars array named Elevation on the point data of the input dataset and overasdf write an array named Elevation if present.

extract_cells
(ind)¶ Return a subset of the grid.
 Parameters
ind (np.ndarray) – Numpy array of cell indices to be extracted.
 Returns
subgrid – Subselected grid
 Return type

extract_edges
(feature_angle=30, boundary_edges=True, non_manifold_edges=True, feature_edges=True, manifold_edges=True, inplace=False)¶ Extract edges from the surface of the mesh.
If the given mesh is not PolyData, the external surface of the given mesh is extracted and used. From vtk documentation, the edges are one of the following
boundary (used by one polygon) or a line cell
nonmanifold (used by three or more polygons)
feature edges (edges used by two triangles and whose dihedral angle > feature_angle)
manifold edges (edges used by exactly two polygons).
 Parameters
feature_angle (float, optional) – Defaults to 30 degrees.
boundary_edges (bool, optional) – Defaults to True
non_manifold_edges (bool, optional) – Defaults to True
feature_edges (bool, optional) – Defaults to True
manifold_edges (bool, optional) – Defaults to True
inplace (bool, optional) – Return new mesh or overwrite input.
 Returns
edges – Extracted edges. None if inplace=True.
 Return type
pyvista.vtkPolyData

extract_geometry
()¶ Extract the outer surface of a volume or structured grid dataset as PolyData.
This will extract all 0D, 1D, and 2D cells producing the boundary faces of the dataset.

extract_largest
(inplace=False)¶ Extract largest connected set in mesh.
Can be used to reduce residues obtained when generating an isosurface. Works only if residues are not connected (share at least one point with) the main component of the image.
 Parameters
inplace (bool, optional) – Updates mesh inplace while returning nothing.
 Returns
mesh – Largest connected set in mesh
 Return type

extract_points
(ind)¶ Return a subset of the grid (with cells) that contains any of the given point indices.
 Parameters
ind (np.ndarray, list, or iterable) – Numpy array of point indices to be extracted.
 Returns
subgrid – Subselected grid.
 Return type

extract_selection_points
(ind)¶ Return a subset of the grid (with cells) that contains any of the given point indices.
DEPRECATED: Please use
extract_points
instead.

extract_surface
(pass_pointid=True, pass_cellid=True, inplace=False)¶ Extract surface mesh of the grid.
 Parameters
pass_pointid (bool, optional) – Adds a point array “vtkOriginalPointIds” that idenfities which original points these surface points correspond to
pass_cellid (bool, optional) – Adds a cell array “vtkOriginalPointIds” that idenfities which original cells these surface cells correspond to
inplace (bool, optional) – Return new mesh or overwrite input.
 Returns
extsurf – Surface mesh of the grid
 Return type

glyph
(orient=True, scale=True, factor=1.0, geom=None, tolerance=0.0, absolute=False, clamping=False, rng=None)¶ Copy a geometric representation (called a glyph) to every point in the input dataset.
The glyph may be oriented along the input vectors, and it may be scaled according to scalar data or vector magnitude.
 Parameters
orient (bool) – Use the active vectors array to orient the glyphs
scale (bool) – Use the active scalars to scale the glyphs
factor (float) – Scale factor applied to sclaing array
geom (vtk.vtkDataSet) – The geometry to use for the glyph
tolerance (float, optional) – Specify tolerance in terms of fraction of bounding box length. Float value is between 0 and 1. Default is 0.0. If
absolute
isTrue
then the tolerance can be an absolute distance.absolute (bool, optional) – Control if
tolerance
is an absolute distance or a fraction.clamping (bool) – Turn on/off clamping of “scalar” values to range.
rng (tuple(float), optional) – Set the range of values to be considered by the filter when scalars values are provided.

interpolate
(points, sharpness=2, radius=1.0, dimensions=(101, 101, 101), pass_cell_arrays=True, pass_point_arrays=True, null_value=0.0)¶ Interpolate values onto this mesh from the point data of a given dataset.
The input dataset is typically a point cloud.
This uses a gaussian interpolation kernel. Use the
sharpness
andradius
parameters to adjust this kernel.Please note that the source dataset is first interpolated onto a fine UniformGrid which is then sampled to this mesh. The interpolation grid’s dimensions will likely need to be tweaked for each individual use case.
 Parameters
points (pyvista.PolyData) – The points whose values will be interpolated onto this mesh.
sharpness (float) – Set / Get the sharpness (i.e., falloff) of the Gaussian. By default Sharpness=2. As the sharpness increases the effects of distant points are reduced.
radius (float) – Specify the radius within which the basis points must lie.
dimensions (tuple(int)) – When interpolating the points, they are first interpolating on to a
pyvista.UniformGrid
with the same spatial extent dimensions
is number of points along each axis for that grid.pass_cell_arrays (bool, optional) – Preserve source mesh’s original cell data arrays
pass_point_arrays (bool, optional) – Preserve source mesh’s original point data arrays
null_value (float, optional) – Specify the null point value. When a null point is encountered then all components of each null tuple are set to this value. By default the null value is set to zero.

merge
(grid=None, merge_points=True, inplace=False, main_has_priority=True)¶ Join one or many other grids to this grid.
Grid is updated inplace by default.
Can be used to merge points of adjcent cells when no grids are input.
 Parameters
grid (vtk.UnstructuredGrid or list of vtk.UnstructuredGrids) – Grids to merge to this grid.
merge_points (bool, optional) – Points in exactly the same location will be merged between the two meshes. Warning: this can leave degenerate point data.
inplace (bool, optional) – Updates grid inplace when True if the input type is an
pyvista.UnstructuredGrid
.main_has_priority (bool, optional) – When this parameter is true and merge_points is true, the arrays of the merging grids will be overwritten by the original main mesh.
 Returns
merged_grid – Merged grid. Returned when inplace is False.
 Return type
vtk.UnstructuredGrid
Notes
When two or more grids are joined, the type and name of each array must match or the arrays will be ignored and not included in the final merged mesh.

outline
(generate_faces=False)¶ Produce an outline of the full extent for the input dataset.
 Parameters
generate_faces (bool, optional) – Generate solid faces for the box. This is off by default

outline_corners
(factor=0.2)¶ Produce an outline of the corners for the input dataset.
 Parameters
factor (float, optional) – controls the relative size of the corners to the length of the corresponding bounds

plot_over_line
(pointa, pointb, resolution=None, scalars=None, title=None, ylabel=None, figsize=None, figure=True, show=True)¶ Sample a dataset along a high resolution line and plot.
Plot the variables of interest in 2D where the Xaxis is distance from Point A and the Yaxis is the variable of interest. Note that this filter returns None.
 Parameters
pointa (np.ndarray or list) – Location in [x, y, z].
pointb (np.ndarray or list) – Location in [x, y, z].
resolution (int) – number of pieces to divide line into. Defaults to number of cells in the input mesh. Must be a positive integer.
scalars (str) – The string name of the variable in the input dataset to probe. The active scalar is used by default.
title (str) – The string title of the matplotlib figure
ylabel (str) – The string label of the Yaxis. Defaults to variable name
figsize (tuple(int)) – the size of the new figure
figure (bool) – flag on whether or not to create a new figure
show (bool) – Shows the matplotlib figure

point_data_to_cell_data
(pass_point_data=False)¶ Transform point data into cell data.
Point data are specified per node and cell data specified within cells. Optionally, the input point data can be passed through to the output.
See also:
pyvista.DataSetFilters.cell_data_to_point_data()
 Parameters
pass_point_data (bool) – If enabled, pass the input point data through to the output

ptc
(pass_point_data=False)¶ Transform point data into cell data.
Point data are specified per node and cell data specified within cells. Optionally, the input point data can be passed through to the output.
An alias/shortcut for
point_data_to_cell_data
.

sample
(target, tolerance=None, pass_cell_arrays=True, pass_point_arrays=True)¶ Resample array data from a passed mesh onto this mesh.
This uses
vtk.vtkResampleWithDataSet
. Parameters
dataset (pyvista.Common) – The source vtk data object as the mesh to sample values on to
target (pyvista.Common) – The vtk data object to sample from  point and cell arrays from this object are sampled onto the nodes of the
dataset
meshtolerance (float, optional) – tolerance used to compute whether a point in the source is in a cell of the input. If not given, tolerance automatically generated.
pass_cell_arrays (bool, optional) – Preserve source mesh’s original cell data arrays
pass_point_arrays (bool, optional) – Preserve source mesh’s original point data arrays

sample_over_line
(pointa, pointb, resolution=None)¶ Sample a dataset onto a line.
 Parameters
pointa (np.ndarray or list) – Location in [x, y, z].
pointb (np.ndarray or list) – Location in [x, y, z].
resolution (int) – Number of pieces to divide line into. Defaults to number of cells in the input mesh. Must be a positive integer.
 Returns
sampled_line – Line object with sampled data from dataset.
 Return type
pv.PolyData

select_enclosed_points
(surface, tolerance=0.001, inside_out=False, check_surface=True)¶ Mark points as to whether they are inside a closed surface.
This evaluates all the input points to determine whether they are in an enclosed surface. The filter produces a (0,1) mask (in the form of a vtkDataArray) that indicates whether points are outside (mask value=0) or inside (mask value=1) a provided surface. (The name of the output vtkDataArray is “SelectedPoints”.)
This filter produces and output data array, but does not modify the input dataset. If you wish to extract cells or poinrs, various threshold filters are available (i.e., threshold the output array).
Warning
The filter assumes that the surface is closed and manifold. A boolean flag can be set to force the filter to first check whether this is true. If false, all points will be marked outside. Note that if this check is not performed and the surface is not closed, the results are undefined.
 Parameters
surface (pyvista.PolyData) – Set the surface to be used to test for containment. This must be a
pyvista.PolyData
object.tolerance (float) – The tolerance on the intersection. The tolerance is expressed as a fraction of the bounding box of the enclosing surface.
inside_out (bool) – By default, points inside the surface are marked inside or sent to the output. If
inside_out
isTrue
, then the points outside the surface are marked inside.check_surface (bool) – Specify whether to check the surface for closure. If on, then the algorithm first checks to see if the surface is closed and manifold. If the surface is not closed and manifold, a runtime error is raised.

slice
(normal='x', origin=None, generate_triangles=False, contour=False)¶ Slice a dataset by a plane at the specified origin and normal vector orientation.
If no origin is specified, the center of the input dataset will be used.
 Parameters
normal (tuple(float) or str) – Length 3 tuple for the normal vector direction. Can also be specified as a string conventional direction such as
'x'
for(1,0,0)
or'x'
for(1,0,0)`
, etc.origin (tuple(float)) – The center (x,y,z) coordinate of the plane on which the slice occurs
generate_triangles (bool, optional) – If this is enabled (
False
by default), the output will be triangles otherwise, the output will be the intersection polygons.contour (bool, optional) – If True, apply a
contour
filter after slicing

slice_along_axis
(n=5, axis='x', tolerance=None, generate_triangles=False, contour=False, bounds=None, center=None)¶ Create many slices of the input dataset along a specified axis.
 Parameters
n (int) – The number of slices to create
axis (str or int) – The axis to generate the slices along. Perpendicular to the slices. Can be string name (
'x'
,'y'
, or'z'
) or axis index (0
,1
, or2
).tolerance (float, optional) – The toleranceerance to the edge of the dataset bounds to create the slices
generate_triangles (bool, optional) – If this is enabled (
False
by default), the output will be triangles otherwise, the output will be the intersection polygons.contour (bool, optional) – If True, apply a
contour
filter after slicing

slice_along_line
(line, generate_triangles=False, contour=False)¶ Slice a dataset using a polyline/spline as the path.
This also works for lines generated with
pyvista.Line()
 Parameters
line (pyvista.PolyData) – A PolyData object containing one single PolyLine cell.
generate_triangles (bool, optional) – If this is enabled (
False
by default), the output will be triangles otherwise, the output will be the intersection polygons.contour (bool, optional) – If True, apply a
contour
filter after slicing

slice_orthogonal
(x=None, y=None, z=None, generate_triangles=False, contour=False)¶ Create three orthogonal slices through the dataset on the three cartesian planes.
Yields a MutliBlock dataset of the three slices.
 Parameters
x (float) – The X location of the YZ slice
y (float) – The Y location of the XZ slice
z (float) – The Z location of the XY slice
generate_triangles (bool, optional) – If this is enabled (
False
by default), the output will be triangles otherwise, the output will be the intersection polygons.contour (bool, optional) – If True, apply a
contour
filter after slicing

split_bodies
(label=False)¶ Find, label, and split connected bodies/volumes.
This splits different connected bodies into blocks in a MultiBlock dataset.
 Parameters
label (bool) – A flag on whether to keep the ID arrays given by the
connectivity
filter.

streamlines
(vectors=None, source_center=None, source_radius=None, n_points=100, integrator_type=45, integration_direction='both', surface_streamlines=False, initial_step_length=0.5, step_unit='cl', min_step_length=0.01, max_step_length=1.0, max_steps=2000, terminal_speed=1e12, max_error=1e06, max_time=None, compute_vorticity=True, rotation_scale=1.0, interpolator_type='point', start_position=(0.0, 0.0, 0.0), return_source=False, pointa=None, pointb=None)¶ Integrate a vector field to generate streamlines.
The integration is performed using a specified integrator, by default RungeKutta2. This supports integration through any type of dataset. Thus if the dataset contains 2D cells like polygons or triangles, the integration is constrained to lie on the surface defined by 2D cells.
This produces polylines as the output, with each cell (i.e., polyline) representing a streamline. The attribute values associated with each streamline are stored in the cell data, whereas those associated with streamlinepoints are stored in the point data.
This uses a Sphere as the source  set it’s location and radius via the
source_center
andsource_radius
keyword arguments. You can retrieve the source aspyvista.PolyData
by specifyingreturn_source=True
. Parameters
vectors (str) – The string name of the active vector field to integrate across
source_center (tuple(float)) – Length 3 tuple of floats defining the center of the source particles. Defaults to the center of the dataset
source_radius (float) – Float radius of the source particle cloud. Defaults to onetenth of the diagonal of the dataset’s spatial extent
n_points (int) – Number of particles present in source sphere
integrator_type (int) – The integrator type to be used for streamline generation. The default is RungeKutta45. The recognized solvers are: RUNGE_KUTTA2 (
2
), RUNGE_KUTTA4 (4
), and RUNGE_KUTTA45 (45
). Options are2
,4
, or45
. Default is45
.integration_direction (str) – Specify whether the streamline is integrated in the upstream or downstream directions (or both). Options are
'both'
,'backward'
, or'forward'
.surface_streamlines (bool) – Compute streamlines on a surface. Default
False
initial_step_length (float) – Initial step size used for line integration, expressed ib length unitsL or cell length units (see
step_unit
parameter). either the starting size for an adaptive integrator, e.g., RK45, or the constant / fixed size for nonadaptive ones, i.e., RK2 and RK4)step_unit (str) – Uniform integration step unit. The valid unit is now limited to only LENGTH_UNIT (
'l'
) and CELL_LENGTH_UNIT ('cl'
). Default is CELL_LENGTH_UNIT:'cl'
.min_step_length (float) – Minimum step size used for line integration, expressed in length or cell length units. Only valid for an adaptive integrator, e.g., RK45
max_step_length (float) – Maxmimum step size used for line integration, expressed in length or cell length units. Only valid for an adaptive integrator, e.g., RK45
max_steps (int) – Maximum number of steps for integrating a streamline. Defaults to
2000
terminal_speed (float) – Terminal speed value, below which integration is terminated.
max_error (float) – Maximum error tolerated throughout streamline integration.
max_time (float) – Specify the maximum length of a streamline expressed in LENGTH_UNIT.
compute_vorticity (bool) – Vorticity computation at streamline points (necessary for generating proper streamribbons using the
vtkRibbonFilter
.interpolator_type (str) – Set the type of the velocity field interpolator to locate cells during streamline integration either by points or cells. The cell locator is more robust then the point locator. Options are
'point'
or'cell'
(abbreviations of'p'
and'c'
are also supported).rotation_scale (float) – This can be used to scale the rate with which the streamribbons twist. The default is 1.
start_position (tuple(float)) – Set the start position. Default is
(0.0, 0.0, 0.0)
return_source (bool) – Return the source particles as
pyvista.PolyData
as well as the streamlines. This will be the second value returned ifTrue
.pointb (pointa,) – The coordinates of a start and end point for a line source. This will override the sphere point source.

surface_indices
()¶ Return the surface indices of a grid.
 Returns
surf_ind – Indices of the surface points.
 Return type
np.ndarray

texture_map_to_plane
(origin=None, point_u=None, point_v=None, inplace=False, name='Texture Coordinates', use_bounds=False)¶ Texture map this dataset to a user defined plane.
This is often used to define a plane to texture map an image to this dataset. The plane defines the spatial reference and extent of that image.
 Parameters
origin (tuple(float)) – Length 3 iterable of floats defining the XYZ coordinates of the BOTTOM LEFT CORNER of the plane
point_u (tuple(float)) – Length 3 iterable of floats defining the XYZ coordinates of the BOTTOM RIGHT CORNER of the plane
point_v (tuple(float)) – Length 3 iterable of floats defining the XYZ coordinates of the TOP LEFT CORNER of the plane
inplace (bool, optional) – If True, the new texture coordinates will be added to the dataset inplace. If False (default), a new dataset is returned with the textures coordinates
name (str, optional) – The string name to give the new texture coordinates if applying the filter inplace.
use_bounds (bool) – Use the bounds to set the mapping plane by default (bottom plane of the bounding box).

threshold
(value=None, scalars=None, invert=False, continuous=False, preference='cell')¶ Apply a
vtkThreshold
filter to the input dataset.This filter will apply a
vtkThreshold
filter to the input dataset and return the resulting object. This extracts cells where the scalar value in each cell satisfies threshold criterion. If scalars is None, the inputs active scalars is used. Parameters
value (float or iterable, optional) – Single value or (min, max) to be used for the data threshold. If iterable, then length must be 2. If no value is specified, the nonNaN data range will be used to remove any NaN values.
scalars (str, optional) – Name of scalars to threshold on. Defaults to currently active scalars.
invert (bool, optional) – If value is a single value, when invert is True cells are kept when their values are below parameter “value”. When invert is False cells are kept when their value is above the threshold “value”. Default is False: yielding above the threshold “value”.
continuous (bool, optional) – When True, the continuous interval [minimum cell scalar, maxmimum cell scalar] will be used to intersect the threshold bound, rather than the set of discrete scalar values from the vertices.
preference (str, optional) – When scalars is specified, this is the preferred array type to search for in the dataset. Must be either
'point'
or'cell'

threshold_percent
(percent=0.5, scalars=None, invert=False, continuous=False, preference='cell')¶ Threshold the dataset by a percentage of its range on the active scalars array or as specified.
 Parameters
percent (float or tuple(float), optional) – The percentage (0,1) to threshold. If value is out of 0 to 1 range, then it will be divided by 100 and checked to be in that range.
scalars (str, optional) – Name of scalars to threshold on. Defaults to currently active scalars.
invert (bool, optional) – When invert is True cells are kept when their values are below the percentage of the range. When invert is False, cells are kept when their value is above the percentage of the range. Default is False: yielding above the threshold “value”.
continuous (bool, optional) – When True, the continuous interval [minimum cell scalar, maxmimum cell scalar] will be used to intersect the threshold bound, rather than the set of discrete scalar values from the vertices.
preference (str, optional) – When scalars is specified, this is the preferred array type to search for in the dataset. Must be either
'point'
or'cell'

triangulate
(inplace=False)¶ Return an all triangle mesh.
More complex polygons will be broken down into triangles.
 Parameters
inplace (bool, optional) – Updates mesh inplace while returning
None
. Returns
mesh – Mesh containing only triangles.
None
wheninplace=True
 Return type

warp_by_scalar
(scalars=None, factor=1.0, normal=None, inplace=False, **kwargs)¶ Warp the dataset’s points by a point data scalars array’s values.
This modifies point coordinates by moving points along point normals by the scalar amount times the scale factor.
 Parameters
scalars (str, optional) – Name of scalars to warb by. Defaults to currently active scalars.
factor (float, optional) – A scalaing factor to increase the scaling effect. Alias
scale_factor
also accepted  if present, overridesfactor
.normal (np.array, list, tuple of length 3) – User specified normal. If given, data normals will be ignored and the given normal will be used to project the warp.
inplace (bool) – If True, the points of the give dataset will be updated.

wireframe
()¶ Extract all the internal/external edges of the dataset as PolyData.
This produces a full wireframe representation of the input dataset.

PolyData Filters¶
The pyvista.PolyDataFilters
is inherited by pyvista.PolyData
making all the following filters available as callable methods directly
from any PolyData
mesh.
Methods

Add a mesh to the current mesh. 

Perform a Boolean cut using another mesh. 

Combine two meshes and retains only the volume in common between the meshes. 

Combine two meshes and attempts to create a manifold mesh. 

Clean the mesh. 

Clip a dataset by a plane by specifying the origin and normal. 

Compute the arc length over the length of the probed line. 

Compute point and/or cell normals for a mesh. 

Return the pointwise curvature of a mesh. 

Reduce the number of triangles in a triangular mesh using vtkQuadricDecimation. 

Reduce the number of triangles in a triangular mesh. 

Apply a delaunay 2D filter along the best fitting plane. 

Apply a delaunay 2D filter along the best fitting plane. 

Return a mask of the points of a surface mesh that has a surface angle greater than angle. 

Fill holes in a pyvista.PolyData or vtk.vtkPolyData object. 

Flip normals of a triangular mesh by reversing the point ordering. 

Calculate the geodesic path between two vertices using Dijkstra’s algorithm. 

Calculate the geodesic distance between two vertices using Dijkstra’s algorithm. 

Plot boundaries of a mesh. 

Plot the curvature. 

Plot the point normals of a mesh. 

Project points of this mesh to a plane. 

Perform a single ray trace calculation. 

Rebuild a mesh by removing points. 

Create a ribbon of the lines in this dataset. 

Adjust point coordinates using Laplacian smoothing. 

Increase the number of triangles in a single, connected triangular mesh. 

Return an all triangle mesh. 

Return an all triangle mesh. 

Generate a tube around each input line. 

class
pyvista.
PolyDataFilters
¶ Bases:
pyvista.core.filters.DataSetFilters
An internal class to manage filtes/algorithms for polydata datasets.

boolean_add
(mesh, inplace=False)¶ Add a mesh to the current mesh.
Does not attempt to “join” the meshes.
 Parameters
mesh (pyvista.PolyData) – The mesh to add.
inplace (bool, optional) – Updates mesh inplace while returning nothing.
 Returns
joinedmesh – Initial mesh and the new mesh when inplace=False.
 Return type

boolean_cut
(cut, tolerance=1e05, inplace=False)¶ Perform a Boolean cut using another mesh.
 Parameters
cut (pyvista.PolyData) – Mesh making the cut
inplace (bool, optional) – Updates mesh inplace while returning nothing.
 Returns
mesh – The cut mesh when inplace=False
 Return type

boolean_difference
(mesh, inplace=False)¶ Combine two meshes and retains only the volume in common between the meshes.
 Parameters
mesh (pyvista.PolyData) – The mesh to perform a union against.
inplace (bool, optional) – Updates mesh inplace while returning nothing.
 Returns
union – The union mesh when inplace=False.
 Return type

boolean_union
(mesh, inplace=False)¶ Combine two meshes and attempts to create a manifold mesh.
 Parameters
mesh (pyvista.PolyData) – The mesh to perform a union against.
inplace (bool, optional) – Updates mesh inplace while returning nothing.
 Returns
union – The union mesh when inplace=False.
 Return type

clean
(point_merging=True, tolerance=None, lines_to_points=True, polys_to_lines=True, strips_to_polys=True, inplace=False, absolute=True, **kwargs)¶ Clean the mesh.
This merges duplicate points, removes unused points, and/or removes degenerate cells.
 Parameters
point_merging (bool, optional) – Enables point merging. On by default.
tolerance (float, optional) – Set merging tolerance. When enabled merging is set to absolute distance. If
absolute
is False, then the merging tolerance is a fraction of the bounding box length. The aliasmerge_tol
is also excepted.lines_to_points (bool, optional) – Turn on/off conversion of degenerate lines to points. Enabled by default.
polys_to_lines (bool, optional) – Turn on/off conversion of degenerate polys to lines. Enabled by default.
strips_to_polys (bool, optional) – Turn on/off conversion of degenerate strips to polys.
inplace (bool, optional) – Updates mesh inplace while returning nothing. Default True.
absolute (bool, optional) – Control if
tolerance
is an absolute distance or a fraction.
 Returns
mesh – Cleaned mesh. None when inplace=True
 Return type

clip_with_plane
(origin, normal, value=0, invert=False, inplace=False)¶ Clip a dataset by a plane by specifying the origin and normal.
DEPRECATED: Please use .clip instead.

compute_arc_length
()¶ Compute the arc length over the length of the probed line.
It adds a new pointdata array named “arc_length” with the computed arc length for each of the polylines in the input. For all other cell types, the arc length is set to 0.

compute_normals
(cell_normals=True, point_normals=True, split_vertices=False, flip_normals=False, consistent_normals=True, auto_orient_normals=False, non_manifold_traversal=True, feature_angle=30.0, inplace=False)¶ Compute point and/or cell normals for a mesh.
The filter can reorder polygons to insure consistent orientation across polygon neighbors. Sharp edges can be split and points duplicated with separate normals to give crisp (rendered) surface definition. It is also possible to globally flip the normal orientation.
The algorithm works by determining normals for each polygon and then averaging them at shared points. When sharp edges are present, the edges are split and new points generated to prevent blurry edges (due to Gouraud shading).
 Parameters
cell_normals (bool, optional) – Calculation of cell normals. Defaults to True.
point_normals (bool, optional) – Calculation of point normals. Defaults to True.
split_vertices (bool, optional) – Splitting of sharp edges. Defaults to False.
flip_normals (bool, optional) – Set global flipping of normal orientation. Flipping modifies both the normal direction and the order of a cell’s points. Defaults to False.
consistent_normals (bool, optional) – Enforcement of consistent polygon ordering. Defaults to True.
auto_orient_normals (bool, optional) – Turn on/off the automatic determination of correct normal orientation. NOTE: This assumes a completely closed surface (i.e. no boundary edges) and no nonmanifold edges. If these constraints do not hold, all bets are off. This option adds some computational complexity, and is useful if you don’t want to have to inspect the rendered image to determine whether to turn on the FlipNormals flag. However, this flag can work with the FlipNormals flag, and if both are set, all the normals in the output will point “inward”. Defaults to False.
non_manifold_traversal (bool, optional) – Turn on/off traversal across nonmanifold edges. Changing this may prevent problems where the consistency of polygonal ordering is corrupted due to topological loops. Defaults to True.
feature_angle (float, optional) – The angle that defines a sharp edge. If the difference in angle across neighboring polygons is greater than this value, the shared edge is considered “sharp”. Defaults to 30.0.
inplace (bool, optional) – Updates mesh inplace while returning nothing. Defaults to False.
 Returns
mesh – Updated mesh with cell and point normals if inplace=False
 Return type
Notes
Previous arrays named “Normals” will be overwritten.
Normals are computed only for polygons and triangle strips. Normals are not computed for lines or vertices.
Triangle strips are broken up into triangle polygons. You may want to restrip the triangles.
May be easier to run mesh.point_normals or mesh.cell_normals

curvature
(curv_type='mean')¶ Return the pointwise curvature of a mesh.
 Parameters
mesh (vtk.polydata) – vtk polydata mesh
string, optional (curvature) – One of the following strings Mean Gaussian Maximum Minimum
 Returns
curvature – Curvature values
 Return type
np.ndarray

decimate
(target_reduction, volume_preservation=False, attribute_error=False, scalars=True, vectors=True, normals=False, tcoords=True, tensors=True, scalars_weight=0.1, vectors_weight=0.1, normals_weight=0.1, tcoords_weight=0.1, tensors_weight=0.1, inplace=False)¶ Reduce the number of triangles in a triangular mesh using vtkQuadricDecimation.
 Parameters
mesh (vtk.PolyData) – Mesh to decimate
target_reduction (float) – Fraction of the original mesh to remove. TargetReduction is set to 0.9, this filter will try to reduce the data set to 10% of its original size and will remove 90% of the input triangles.
volume_preservation (bool, optional) – Decide whether to activate volume preservation which greatly reduces errors in triangle normal direction. If off, volume preservation is disabled and if AttributeErrorMetric is active, these errors can be large. Defaults to False.
attribute_error (bool, optional) – Decide whether to include data attributes in the error metric. If off, then only geometric error is used to control the decimation. Defaults to False.
scalars (bool, optional) – If attribute errors are to be included in the metric (i.e., AttributeErrorMetric is on), then the following flags control which attributes are to be included in the error calculation. Defaults to True.
vectors (bool, optional) – See scalars parameter. Defaults to True.
normals (bool, optional) – See scalars parameter. Defaults to False.
tcoords (bool, optional) – See scalars parameter. Defaults to True.
tensors (bool, optional) – See scalars parameter. Defaults to True.
scalars_weight (float, optional) – The scaling weight contribution of the scalar attribute. These values are used to weight the contribution of the attributes towards the error metric. Defaults to 0.1.
vectors_weight (float, optional) – See scalars weight parameter. Defaults to 0.1.
normals_weight (float, optional) – See scalars weight parameter. Defaults to 0.1.
tcoords_weight (float, optional) – See scalars weight parameter. Defaults to 0.1.
tensors_weight (float, optional) – See scalars weight parameter. Defaults to 0.1.
inplace (bool, optional) – Updates mesh inplace while returning nothing.
 Returns
outmesh – Decimated mesh. None when inplace=True.
 Return type

decimate_pro
(reduction, feature_angle=45.0, split_angle=75.0, splitting=True, pre_split_mesh=False, preserve_topology=False, inplace=False)¶ Reduce the number of triangles in a triangular mesh.
It forms a good approximation to the original geometry. Based on the algorithm originally described in “Decimation of Triangle Meshes”, Proc Siggraph 92.
 Parameters
reduction (float) – Reduction factor. A value of 0.9 will leave 10 % of the original number of vertices.
feature_angle (float, optional) – Angle used to define what an edge is (i.e., if the surface normal between two adjacent triangles is >= feature_angle, an edge exists).
split_angle (float, optional) – Angle used to control the splitting of the mesh. A split line exists when the surface normals between two edge connected triangles are >= split_angle.
splitting (bool, optional) – Controls the splitting of the mesh at corners, along edges, at nonmanifold points, or anywhere else a split is required. Turning splitting off will better preserve the original topology of the mesh, but may not necessarily give the exact requested decimation.
pre_split_mesh (bool, optional) – Separates the mesh into semiplanar patches, which are disconnected from each other. This can give superior results in some cases. If pre_split_mesh is set to True, the mesh is split with the specified split_angle. Otherwise mesh splitting is deferred as long as possible.
preserve_topology (bool, optional) – Controls topology preservation. If on, mesh splitting and hole elimination will not occur. This may limit the maximum reduction that may be achieved.
inplace (bool, optional) – Updates mesh inplace while returning nothing.
 Returns
mesh – Decimated mesh. None when inplace=True.
 Return type

delaunay_2d
(tol=1e05, alpha=0.0, offset=1.0, bound=False, inplace=False, edge_source=None)¶ Apply a delaunay 2D filter along the best fitting plane.
 Parameters
tol (float) – Specify a tolerance to control discarding of closely spaced points. This tolerance is specified as a fraction of the diagonal length of the bounding box of the points.
alpha (float) – Specify alpha (or distance) value to control output of this filter. For a nonzero alpha value, only edges or triangles contained within a sphere centered at mesh vertices will be output. Otherwise, only triangles will be output.
offset (float) – Specify a multiplier to control the size of the initial, bounding Delaunay triangulation.
bound (bool) – Boolean controls whether bounding triangulation points (and associated triangles) are included in the output. (These are introduced as an initial triangulation to begin the triangulation process. This feature is nice for debugging output.)
inplace (bool) – If True, overwrite this mesh with the triangulated mesh.
edge_source (pyvista.PolyData, optional) – Specify the source object used to specify constrained edges and loops. (This is optional.) If set, and lines/polygons are defined, a constrained triangulation is created. The lines/polygons are assumed to reference points in the input point set (i.e. point ids are identical in the input and source). Note that this method does not connect the pipeline. See SetSourceConnection for connecting the pipeline.

delauney_2d
()¶ Apply a delaunay 2D filter along the best fitting plane.
DEPRECATED. Please see
pyvista.PolyData.delaunay_2d()
.

edge_mask
(angle)¶ Return a mask of the points of a surface mesh that has a surface angle greater than angle.
 Parameters
angle (float) – Angle to consider an edge.

fill_holes
(hole_size, inplace=False)¶ Fill holes in a pyvista.PolyData or vtk.vtkPolyData object.
Holes are identified by locating boundary edges, linking them together into loops, and then triangulating the resulting loops. Note that you can specify an approximate limit to the size of the hole that can be filled.
 Parameters
hole_size (float) – Specifies the maximum hole size to fill. This is represented as a radius to the bounding circumsphere containing the hole. Note that this is an approximate area; the actual area cannot be computed without first triangulating the hole.
inplace (bool, optional) – Return new mesh or overwrite input.
 Returns
mesh – Mesh with holes filled. None when inplace=True
 Return type

flip_normals
()¶ Flip normals of a triangular mesh by reversing the point ordering.

geodesic
(start_vertex, end_vertex, inplace=False)¶ Calculate the geodesic path between two vertices using Dijkstra’s algorithm.
This will add an array titled vtkOriginalPointIds of the input mesh’s point ids to the output mesh.
 Parameters
start_vertex (int) – Vertex index indicating the start point of the geodesic segment.
end_vertex (int) – Vertex index indicating the end point of the geodesic segment.
 Returns
output – PolyData object consisting of the line segment between the two given vertices.
 Return type

geodesic_distance
(start_vertex, end_vertex)¶ Calculate the geodesic distance between two vertices using Dijkstra’s algorithm.
 Parameters
start_vertex (int) – Vertex index indicating the start point of the geodesic segment.
end_vertex (int) – Vertex index indicating the end point of the geodesic segment.
 Returns
length – Length of the geodesic segment.
 Return type
float

plot_boundaries
(edge_color='red', **kwargs)¶ Plot boundaries of a mesh.
 Parameters
edge_color (str, etc.) – The color of the edges when they are added to the plotter.
kwargs (optional) – All additional keyword arguments will be passed to
pyvista.BasePlotter.add_mesh()

plot_curvature
(curv_type='mean', **kwargs)¶ Plot the curvature.
 Parameters
curvtype (str, optional) –
One of the following strings indicating curvature type
Mean
Gaussian
Maximum
Minimum
**kwargs (optional) – See
pyvista.plot()
 Returns
cpos – List of camera position, focal point, and view up
 Return type
list

plot_normals
(show_mesh=True, mag=1.0, flip=False, use_every=1, **kwargs)¶ Plot the point normals of a mesh.

project_points_to_plane
(origin=None, normal=(0, 0, 1), inplace=False)¶ Project points of this mesh to a plane.

ray_trace
(origin, end_point, first_point=False, plot=False, off_screen=False)¶ Perform a single ray trace calculation.
This requires a mesh and a line segment defined by an origin and end_point.
 Parameters
origin (np.ndarray or list) – Start of the line segment.
end_point (np.ndarray or list) – End of the line segment.
first_point (bool, optional) – Returns intersection of first point only.
plot (bool, optional) – Plots ray trace results
off_screen (bool, optional) – Plots off screen. Used for unit testing.
 Returns
intersection_points (np.ndarray) – Location of the intersection points. Empty array if no intersections.
intersection_cells (np.ndarray) – Indices of the intersection cells. Empty array if no intersections.

remove_points
(remove, mode='any', keep_scalars=True, inplace=False)¶ Rebuild a mesh by removing points.
Only valid for alltriangle meshes.
 Parameters
remove (np.ndarray) – If remove is a bool array, points that are True will be removed. Otherwise, it is treated as a list of indices.
mode (str, optional) – When ‘all’, only faces containing all points flagged for removal will be removed. Default ‘all’
keep_scalars (bool, optional) – When True, point and cell scalars will be passed on to the new mesh.
inplace (bool, optional) – Updates mesh inplace while returning nothing.
 Returns
mesh (pyvista.PolyData) – Mesh without the points flagged for removal. Not returned when inplace=False.
ridx (np.ndarray) – Indices of new points relative to the original mesh. Not returned when inplace=False.

ribbon
(width=None, scalars=None, angle=0.0, factor=2.0, normal=None, tcoords=False, preference='points')¶ Create a ribbon of the lines in this dataset.
Note
If there are no lines in the input dataset, then the output will be an empty PolyData mesh.
 Parameters
width (float) – Set the “half” width of the ribbon. If the width is allowed to vary, this is the minimum width. The default is 10% the length
scalars (str, optional) – String name of the scalars array to use to vary the ribbon width. This is only used if a scalars array is specified.
angle (float) – Set the offset angle of the ribbon from the line normal. (The angle is expressed in degrees.) The default is 0.0
factor (float) – Set the maximum ribbon width in terms of a multiple of the minimum width. The default is 2.0
normal (tuple(float), optional) – Normal to use as default
tcoords (bool, str, optional) – If True, generate texture coordinates along the ribbon. This can also be specified to generate the texture coordinates in the following ways:
'length'
,'normalized'
,

smooth
(n_iter=20, relaxation_factor=0.01, convergence=0.0, edge_angle=15, feature_angle=45, boundary_smoothing=True, feature_smoothing=False, inplace=False)¶ Adjust point coordinates using Laplacian smoothing.
The effect is to “relax” the mesh, making the cells better shaped and the vertices more evenly distributed.
 Parameters
n_iter (int) – Number of iterations for Laplacian smoothing.
relaxation_factor (float, optional) – Relaxation factor controls the amount of displacement in a single iteration. Generally a lower relaxation factor and higher number of iterations is numerically more stable.
convergence (float, optional) – Convergence criterion for the iteration process. Smaller numbers result in more smoothing iterations. Range from (0 to 1).
edge_angle (float, optional) – Edge angle to control smoothing along edges (either interior or boundary).
feature_angle (float, optional) – Feature angle for sharp edge identification.
boundary_smoothing (bool, optional) – Boolean flag to control smoothing of boundary edges.
feature_smoothing (bool, optional) – Boolean flag to control smoothing of feature edges.
inplace (bool, optional) – Updates mesh inplace while returning nothing.
 Returns
mesh – Decimated mesh. None when inplace=True.
 Return type

subdivide
(nsub, subfilter='linear', inplace=False)¶ Increase the number of triangles in a single, connected triangular mesh.
Uses one of the following vtk subdivision filters to subdivide a mesh. vtkButterflySubdivisionFilter vtkLoopSubdivisionFilter vtkLinearSubdivisionFilter
Linear subdivision results in the fastest mesh subdivision, but it does not smooth mesh edges, but rather splits each triangle into 4 smaller triangles.
Butterfly and loop subdivision perform smoothing when dividing, and may introduce artifacts into the mesh when dividing.
Subdivision filter appears to fail for multiple part meshes. Should be one single mesh.
 Parameters
nsub (int) – Number of subdivisions. Each subdivision creates 4 new triangles, so the number of resulting triangles is nface*4**nsub where nface is the current number of faces.
subfilter (string, optional) – Can be one of the following: ‘butterfly’, ‘loop’, ‘linear’
inplace (bool, optional) – Updates mesh inplace while returning nothing.
 Returns
mesh – pyvista polydata object. None when inplace=True
 Return type
Polydata object
Examples
>>> from pyvista import examples >>> import pyvista >>> mesh = pyvista.PolyData(examples.planefile) >>> submesh = mesh.subdivide(1, 'loop')
alternatively, update mesh inplace
>>> mesh.subdivide(1, 'loop', inplace=True)

tri_filter
(inplace=False)¶ Return an all triangle mesh.
DEPRECATED: Please use
triangulate
instead.

triangulate
(inplace=False)¶ Return an all triangle mesh.
More complex polygons will be broken down into triangles.
 Parameters
inplace (bool, optional) – Updates mesh inplace while returning nothing.
 Returns
mesh – Mesh containing only triangles. None when inplace=True
 Return type

tube
(radius=None, scalars=None, capping=True, n_sides=20, radius_factor=10, preference='point', inplace=False)¶ Generate a tube around each input line.
The radius of the tube can be set to linearly vary with a scalar value.
 Parameters
radius (float) – Minimum tube radius (minimum because the tube radius may vary).
scalars (str, optional) – scalars array by which the radius varies
capping (bool) – Turn on/off whether to cap the ends with polygons. Default True.
n_sides (int) – Set the number of sides for the tube. Minimum of 3.
radius_factor (float) – Maximum tube radius in terms of a multiple of the minimum radius.
preference (str) – The field preference when searching for the scalars array by name
inplace (bool, optional) – Updates mesh inplace while returning nothing.
 Returns
mesh – Tubefiltered mesh. None when inplace=True.
 Return type

UnstructuredGrid Filters¶
The pyvista.UnstructuredGridFilters
is inherited by
pyvista.UnstructuredGrid
making all the following filters
available as callable methods directly from any UnstructuredGrid
mesh.
Methods

Apply a delaunay 2D filter along the best fitting plane. 

class
pyvista.
UnstructuredGridFilters
¶ Bases:
pyvista.core.filters.DataSetFilters
An internal class to manage filtes/algorithms for unstructured grid datasets.

delaunay_2d
(tol=1e05, alpha=0.0, offset=1.0, bound=False)¶ Apply a delaunay 2D filter along the best fitting plane.
This extracts the grid’s points and performs the triangulation on those alone.

UniformGrid Filters¶
The pyvista.UniformGridFilters
is inherited by
pyvista.UniformGrid
making all the following filters
available as callable methods directly from any UniformGrid
mesh.
Methods

Select piece (e.g., volume of interest). 

Smooth the data with a Gaussian kernel. 

class
pyvista.
UniformGridFilters
¶ Bases:
pyvista.core.filters.DataSetFilters
An internal class to manage filtes/algorithms for uniform grid datasets.

extract_subset
(voi, rate=(1, 1, 1), boundary=False)¶ Select piece (e.g., volume of interest).
To use this filter set the VOI ivar which are ijk min/max indices that specify a rectangular region in the data. (Note that these are 0offset.) You can also specify a sampling rate to subsample the data.
Typical applications of this filter are to extract a slice from a volume for image processing, subsampling large volumes to reduce data size, or extracting regions of a volume with interesting data.
 Parameters
voi (tuple(int)) – Length 6 iterable of ints:
(xmin, xmax, ymin, ymax, zmin, zmax)
. These bounds specify the volume of interest in ijk min/max indices.rate (tuple(int)) – Length 3 iterable of ints:
(xrate, yrate, zrate)
. Default:(1, 1, 1)
boundary (bool) – Control whether to enforce that the “boundary” of the grid is output in the subsampling process. (This only has effect when the rate in any direction is not equal to 1). When this is on, the subsampling will always include the boundary of the grid even though the sample rate is not an even multiple of the grid dimensions. (By default this is off.)

gaussian_smooth
(radius_factor=1.5, std_dev=2.0, scalars=None, preference='points')¶ Smooth the data with a Gaussian kernel.
 Parameters
radius_factor (float or iterable, optional) – Unitless factor to limit the extent of the kernel.
std_dev (float or iterable, optional) – Standard deviation of the kernel in pixel units.
scalars (str, optional) – Name of scalars to process. Defaults to currently active scalars.
preference (str, optional) – When scalars is specified, this is the preferred array type to search for in the dataset. Must be either
'point'
or'cell'

Composite Filters¶
These are filters that can be applied to composite datasets, i.e.
pyvista.MultiBlock
. The pyvista.CompositeFilters
class
inherits many but not all of the filters from pyvista.DataSetFilters
.
Methods

Generate points at the center of the cells in this dataset. 

Transform cell data into point data. 

Clip a dataset by a plane by specifying the origin and normal. 

Clip a dataset by a bounding box defined by the bounds. 

Append all blocks into a single unstructured grid. 

Compute sizes for 1D (length), 2D (area) and 3D (volume) cells. 

Generate scalar values on a dataset. 

Combine the geomertry of all blocks into a single 

Produce an outline of the full extent for the all blocks in this composite dataset. 

Produce an outline of the corners for the all blocks in this composite dataset. 

Transform point data into cell data. 

Slice a dataset by a plane at the specified origin and normal vector orientation. 

Create many slices of the input dataset along a specified axis. 

Slice a dataset using a polyline/spline as the path. 

Create three orthogonal slices through the dataset on the three cartesian planes. 

Return an all triangle mesh. 

Extract all the internal/external edges of the dataset as PolyData. 

class
pyvista.
CompositeFilters
¶ Bases:
object
An internal class to manage filtes/algorithms for composite datasets.

cell_centers
(vertex=True)¶ Generate points at the center of the cells in this dataset.
These points can be used for placing glyphs / vectors.
 Parameters
vertex (bool) – Enable/disable the generation of vertex cells.

cell_data_to_point_data
(pass_cell_data=False)¶ Transform cell data into point data.
Point data are specified per node and cell data specified within cells. Optionally, the input point data can be passed through to the output.
The method of transformation is based on averaging the data values of all cells using a particular point. Optionally, the input cell data can be passed through to the output as well.
See also:
pyvista.DataSetFilters.point_data_to_cell_data()
 Parameters
pass_cell_data (bool) – If enabled, pass the input cell data through to the output

clip
(normal='x', origin=None, invert=True, value=0.0, inplace=False)¶ Clip a dataset by a plane by specifying the origin and normal.
If no parameters are given the clip will occur in the center of that dataset.
 Parameters
normal (tuple(float) or str) – Length 3 tuple for the normal vector direction. Can also be specified as a string conventional direction such as
'x'
for(1,0,0)
or'x'
for(1,0,0)
, etc.origin (tuple(float)) – The center
(x,y,z)
coordinate of the plane on which the clip occursinvert (bool) – Flag on whether to flip/invert the clip
value (float:) – Set the clipping value of the implicit function (if clipping with implicit function) or scalar value (if clipping with scalars). The default value is 0.0.
inplace (bool, optional) – Updates mesh inplace while returning nothing.

clip_box
(bounds=None, invert=True, factor=0.35)¶ Clip a dataset by a bounding box defined by the bounds.
If no bounds are given, a corner of the dataset bounds will be removed.
 Parameters
bounds (tuple(float)) – Length 6 iterable of floats: (xmin, xmax, ymin, ymax, zmin, zmax). Length 3 iterable of floats: distances from the min coordinate of of the input mesh. Single float value: uniform distance from the min coordinate. Length 12 iterable of length 3 iterable of floats: a plane collection (normal, center, …).
pyvista.PolyData
: if a poly mesh is passed that represents a box with 6 faces that all form a standard box, then planes will be extracted from the box to define the clipping region.invert (bool) – Flag on whether to flip/invert the clip
factor (float, optional) – If bounds are not given this is the factor along each axis to extract the default box.

combine
(merge_points=False)¶ Append all blocks into a single unstructured grid.
 Parameters
merge_points (bool, optional) – Merge coincidental points.

compute_cell_sizes
(length=True, area=True, volume=True)¶ Compute sizes for 1D (length), 2D (area) and 3D (volume) cells.
 Parameters
length (bool) – Specify whether or not to compute the length of 1D cells.
area (bool) – Specify whether or not to compute the area of 2D cells.
volume (bool) – Specify whether or not to compute the volume of 3D cells.

elevation
(low_point=None, high_point=None, scalar_range=None, preference='point', set_active=True)¶ Generate scalar values on a dataset.
The scalar values lie within a user specified range, and are generated by computing a projection of each dataset point onto a line. The line can be oriented arbitrarily. A typical example is to generate scalars based on elevation or height above a plane.
 Parameters
low_point (tuple(float), optional) – The low point of the projection line in 3D space. Default is bottom center of the dataset. Otherwise pass a length 3 tuple(float).
high_point (tuple(float), optional) – The high point of the projection line in 3D space. Default is top center of the dataset. Otherwise pass a length 3 tuple(float).
scalar_range (str or tuple(float), optional) – The scalar range to project to the low and high points on the line that will be mapped to the dataset. If None given, the values will be computed from the elevation (Z component) range between the high and low points. Min and max of a range can be given as a length 2 tuple(float). If
str
name of scalara array present in the dataset given, the valid range of that array will be used.preference (str, optional) – When an array name is specified for
scalar_range
, this is the preferred array type to search for in the dataset. Must be either ‘point’ or ‘cell’.set_active (bool, optional) – A boolean flag on whether or not to set the new Elevation scalar as the active scalars array on the output dataset.
Warning
This will create a scalars array named Elevation on the point data of the input dataset and overasdf write an array named Elevation if present.

extract_geometry
()¶ Combine the geomertry of all blocks into a single
PolyData
object.Place this filter at the end of a pipeline before a polydata consumer such as a polydata mapper to extract geometry from all blocks and append them to one polydata object.

outline
(generate_faces=False, nested=False)¶ Produce an outline of the full extent for the all blocks in this composite dataset.
 Parameters
generate_faces (bool, optional) – Generate solid faces for the box. This is off by default
nested (bool, optional) – If True, these creates individual outlines for each nested dataset

outline_corners
(factor=0.2, nested=False)¶ Produce an outline of the corners for the all blocks in this composite dataset.
 Parameters
factor (float, optional) – controls the relative size of the corners to the length of the corresponding bounds
ested (bool, optional) – If True, these creates individual outlines for each nested dataset

point_data_to_cell_data
(pass_point_data=False)¶ Transform point data into cell data.
Point data are specified per node and cell data specified within cells. Optionally, the input point data can be passed through to the output.
See also:
pyvista.DataSetFilters.cell_data_to_point_data()
 Parameters
pass_point_data (bool) – If enabled, pass the input point data through to the output

slice
(normal='x', origin=None, generate_triangles=False, contour=False)¶ Slice a dataset by a plane at the specified origin and normal vector orientation.
If no origin is specified, the center of the input dataset will be used.
 Parameters
normal (tuple(float) or str) – Length 3 tuple for the normal vector direction. Can also be specified as a string conventional direction such as
'x'
for(1,0,0)
or'x'
for(1,0,0)`
, etc.origin (tuple(float)) – The center (x,y,z) coordinate of the plane on which the slice occurs
generate_triangles (bool, optional) – If this is enabled (
False
by default), the output will be triangles otherwise, the output will be the intersection polygons.contour (bool, optional) – If True, apply a
contour
filter after slicing

slice_along_axis
(n=5, axis='x', tolerance=None, generate_triangles=False, contour=False, bounds=None, center=None)¶ Create many slices of the input dataset along a specified axis.
 Parameters
n (int) – The number of slices to create
axis (str or int) – The axis to generate the slices along. Perpendicular to the slices. Can be string name (
'x'
,'y'
, or'z'
) or axis index (0
,1
, or2
).tolerance (float, optional) – The toleranceerance to the edge of the dataset bounds to create the slices
generate_triangles (bool, optional) – If this is enabled (
False
by default), the output will be triangles otherwise, the output will be the intersection polygons.contour (bool, optional) – If True, apply a
contour
filter after slicing

slice_along_line
(line, generate_triangles=False, contour=False)¶ Slice a dataset using a polyline/spline as the path.
This also works for lines generated with
pyvista.Line()
 Parameters
line (pyvista.PolyData) – A PolyData object containing one single PolyLine cell.
generate_triangles (bool, optional) – If this is enabled (
False
by default), the output will be triangles otherwise, the output will be the intersection polygons.contour (bool, optional) – If True, apply a
contour
filter after slicing

slice_orthogonal
(x=None, y=None, z=None, generate_triangles=False, contour=False)¶ Create three orthogonal slices through the dataset on the three cartesian planes.
Yields a MutliBlock dataset of the three slices.
 Parameters
x (float) – The X location of the YZ slice
y (float) – The Y location of the XZ slice
z (float) – The Z location of the XY slice
generate_triangles (bool, optional) – If this is enabled (
False
by default), the output will be triangles otherwise, the output will be the intersection polygons.contour (bool, optional) – If True, apply a
contour
filter after slicing

triangulate
(inplace=False)¶ Return an all triangle mesh.
More complex polygons will be broken down into triangles.
 Parameters
inplace (bool, optional) – Updates mesh inplace while returning
None
. Returns
mesh – Mesh containing only triangles.
None
wheninplace=True
 Return type

wireframe
()¶ Extract all the internal/external edges of the dataset as PolyData.
This produces a full wireframe representation of the input dataset.
