pyvista.Plotter.add_mesh

pyvista.Plotter.add_mesh#

Add any PyVista/VTK mesh or dataset that PyVista can wrap to the scene.

This method is using a mesh representation to view the surfaces and/or geometry of datasets. For volume rendering, see pyvista.Plotter.add_volume().

To see the what most of the following parameters look like in action, please refer to pyvista.Property.

Parameters:

meshDataSet | MultiBlock | vtkAlgorithm

Any PyVista or VTK mesh is supported. Also, any dataset that pyvista.wrap() can handle including NumPy arrays of XYZ points. Plotting also supports VTK algorithm objects (vtkAlgorithm and vtkAlgorithmOutput). When passing an algorithm, the rendering pipeline will be connected to the passed algorithm to dynamically update the scene (see Plotting with VTK Algorithms for examples).

colorColorLike, optional

Use to make the entire mesh have a single solid color. Either a string, RGB list, or hex color string. For example: color='white', color='w', color=[1.0, 1.0, 1.0], or color='#FFFFFF'. Color will be overridden if scalars are specified.

Defaults to pyvista.global_theme.color.

stylestr, optional

Visualization style of the mesh. One of the following: style='surface', style='wireframe', style='points', style='points_gaussian'. Defaults to 'surface'. Note that 'wireframe' only shows a wireframe of the outer geometry. 'points_gaussian' can be modified with the emissive, render_points_as_spheres options.

scalarsstr | numpy.ndarray, optional

Scalars used to “color” the mesh. Accepts a string name of an array that is present on the mesh or an array equal to the number of cells or the number of points in the mesh. Array should be sized as a single vector. If both color and scalars are None, then the active scalars are used.

climsequence[float], optional

Two item color bar range for scalars. Defaults to minimum and maximum of scalars array. Example: [-1, 2]. rng is also an accepted alias for this.

show_edgesbool, optional

Shows the edges of a mesh. Does not apply to a wireframe representation.

edge_colorColorLike, optional

The solid color to give the edges when show_edges=True. Either a string, RGB list, or hex color string.

Defaults to pyvista.global_theme.edge_color.

point_sizefloat, optional

Point size of any nodes in the dataset plotted. Also applicable when style=’points’. Default 5.0.

line_widthfloat, optional

Thickness of lines. Only valid for wireframe and surface representations. Default None.

opacityfloat | str | array_like

Opacity of the mesh. If a single float value is given, it will be the global opacity of the mesh and uniformly applied everywhere - should be between 0 and 1. A string can also be specified to map the scalars range to a predefined opacity transfer function (options include: 'linear', 'linear_r', 'geom', 'geom_r'). A string could also be used to map a scalars array from the mesh to the opacity (must have same number of elements as the scalars argument). Or you can pass a custom made transfer function that is an array either n_colors in length or shorter.

flip_scalarsbool, default: False

Flip direction of cmap. Most colormaps allow *_r suffix to do this as well.

lightingbool, optional

Enable or disable view direction lighting. Default False.

n_colorsint, optional

Number of colors to use when displaying scalars. Defaults to 256. The scalar bar will also have this many colors.

interpolate_before_mapbool, optional

Enabling makes for a smoother scalars display. Default is True. When False, OpenGL will interpolate the mapped colors which can result is showing colors that are not present in the color map.

cmapstr | list | LookupTable, default: pyvista.plotting.themes.Theme.cmap

If a string, this is the name of the matplotlib colormap to use when mapping the scalars. See Named Colormaps for supported colormaps.

Only applicable for when displaying scalars. colormap is also an accepted alias for this. If colorcet or cmocean are installed, their colormaps can be specified by name.

You can also specify a list of colors to override an existing colormap with a custom one. For example, to create a three color colormap you might specify ['green', 'red', 'blue'].

This parameter also accepts a pyvista.LookupTable. If this is set, all parameters controlling the color map like n_colors will be ignored.

labelstr, optional

String label to use when adding a legend to the scene with pyvista.Plotter.add_legend().

reset_camerabool, optional

Reset the camera after adding this mesh to the scene. The default setting is None, where the camera is only reset if this plotter has already been shown. If False, the camera is not reset regardless of the state of the Plotter. When True, the camera is always reset.

scalar_bar_argsdict, optional

Dictionary of keyword arguments to pass when adding the scalar bar to the scene. For options, see pyvista.Plotter.add_scalar_bar().

show_scalar_barbool, optional

If False, a scalar bar will not be added to the scene.

multi_colorsbool | str | cycler.Cycler | sequence[ColorLike], default: False

If a pyvista.MultiBlock dataset is given this will color each block by a solid color using a custom cycler.

If True, the default ‘matplotlib’ color cycler is used.

See set_color_cycler for usage of custom color cycles.

namestr, optional

The name for the added mesh/actor so that it can be easily updated. If an actor of this name already exists in the rendering window, it will be replaced by the new actor.

texturepyvista.Texture or np.ndarray, optional

A texture to apply if the input mesh has texture coordinates. This will not work with MultiBlock datasets.

render_points_as_spheresbool, optional

Render points as spheres rather than dots.

render_lines_as_tubesbool, optional

Show lines as thick tubes rather than flat lines. Control the width with line_width.

smooth_shadingbool, optional

Enable smooth shading when True using the Phong shading algorithm. When False, use flat shading. Automatically enabled when pbr=True. See Types of Shading.

split_sharp_edgesbool, optional

Split sharp edges exceeding 30 degrees when plotting with smooth shading. Control the angle with the optional keyword argument feature_angle. By default this is False unless overridden by the global or plotter theme. Note that enabling this will create a copy of the input mesh within the plotter. See Types of Shading.

ambientfloat, optional

When lighting is enabled, this is the amount of light in the range of 0 to 1 (default 0.0) that reaches the actor when not directed at the light source emitted from the viewer.

diffusefloat, optional

The diffuse lighting coefficient. Default 1.0.

specularfloat, optional

The specular lighting coefficient. Default 0.0.

specular_powerfloat, optional

The specular power. Between 0.0 and 128.0.

nan_colorColorLike, optional

The color to use for all NaN values in the plotted scalar array.

nan_opacityfloat, optional

Opacity of NaN values. Should be between 0 and 1. Default 1.0.

cullingstr, optional

Does not render faces that are culled. Options are 'front' or 'back'. This can be helpful for dense surface meshes, especially when edges are visible, but can cause flat meshes to be partially displayed. Defaults to False.

rgbbool, optional

If an 2 dimensional array is passed as the scalars, plot those values as RGB(A) colors. rgba is also an accepted alias for this. Opacity (the A) is optional. If a scalars array ending with "_rgba" is passed, the default becomes True. This can be overridden by setting this parameter to False.

categoriesbool, optional

If set to True, then the number of unique values in the scalar array will be used as the n_colors argument.

silhouettedict, bool, optional

If set to True, plot a silhouette highlight for the mesh. This feature is only available for a triangulated PolyData. As a dict, it contains the properties of the silhouette to display:

color: ColorLike, color of the silhouette

line_width: float, edge width

opacity: float between 0 and 1, edge transparency

feature_angle: If a float, display sharp edges exceeding that angle in degrees.

decimate: float between 0 and 1, level of decimation

use_transparencybool, optional

Invert the opacity mappings and make the values correspond to transparency.

below_colorColorLike, optional

Solid color for values below the scalars range (clim). This will automatically set the scalar bar below_label to 'below'.

above_colorColorLike, optional

Solid color for values below the scalars range (clim). This will automatically set the scalar bar above_label to 'above'.

annotationsdict, optional

Pass a dictionary of annotations. Keys are the float values in the scalars range to annotate on the scalar bar and the values are the string annotations.

pickablebool, optional

Set whether this actor is pickable.

preferencestr, default: “point”

When mesh.n_points == mesh.n_cells and setting scalars, this parameter sets how the scalars will be mapped to the mesh. Default 'point', causes the scalars will be associated with the mesh points. Can be either 'point' or 'cell'.

log_scalebool, default: False

Use log scale when mapping data to colors. Scalars less than zero are mapped to the smallest representable positive float.

pbrbool, optional

Enable physics based rendering (PBR) if the mesh is PolyData. Use the color argument to set the base color.

metallicfloat, optional

Usually this value is either 0 or 1 for a real material but any value in between is valid. This parameter is only used by PBR interpolation.

roughnessfloat, optional

This value has to be between 0 (glossy) and 1 (rough). A glossy material has reflections and a high specular part. This parameter is only used by PBR interpolation.

renderbool, default: True

Force a render when True.

user_matrixTransformLike, default: np.eye(4)

Matrix passed to the Actor class before rendering. This affects the actor/rendering only, not the input volume itself. The user matrix is the last transformation applied to the actor before rendering. Defaults to the identity matrix.

componentint, optional

Set component of vector valued scalars to plot. Must be nonnegative, if supplied. If None, the magnitude of the vector is plotted. See Plot Vector Component for examples.

emissivebool, optional

Treat the points/splats as emissive light sources. Only valid for style='points_gaussian' representation.

copy_meshbool, default: False

If True, a copy of the mesh will be made before adding it to the plotter. This is useful if you would like to add the same mesh to a plotter multiple times and display different scalars. Setting copy_mesh to False is necessary if you would like to update the mesh after adding it to the plotter and have these updates rendered, e.g. by changing the active scalars or through an interactive widget. This should only be set to True with caution. Defaults to False. This is ignored if the input is a vtkAlgorithm subclass.

backface_paramsdict | Property, optional

A pyvista.Property or a dict of parameters to use for backface rendering. This is useful for instance when the inside of oriented surfaces has a different color than the outside. When a pyvista.Property, this is directly used for backface rendering. When a dict, valid keys are pyvista.Property attributes, and values are corresponding values to use for the given property. Omitted keys (or the default of backface_params=None) default to the corresponding frontface properties.

show_verticesbool, optional

When style is not 'points', render the external surface vertices. The following optional keyword arguments may be used to control the style of the vertices:

vertex_color - The color of the vertices
vertex_style - Change style to 'points_gaussian'
vertex_opacity - Control the opacity of the vertices

See Visible Vertices for examples.

edge_opacityfloat, optional

Edge opacity of the mesh. A single float value that will be applied globally edge opacity of the mesh and uniformly applied everywhere - should be between 0 and 1.

Note

edge_opacity uses SetEdgeOpacity as the underlying method which requires VTK version 9.3 or higher. If SetEdgeOpacity is not available, edge_opacity is set to 1.

**kwargsdict, optional

Optional keyword arguments.

Returns:

pyvista.Actor: Actor of the mesh.

Examples

Add a sphere to the plotter and show it with a custom scalar bar title.

>>> import pyvista as pv
>>> sphere = pv.Sphere()
>>> sphere['Data'] = sphere.points[:, 2]
>>> plotter = pv.Plotter()
>>> _ = plotter.add_mesh(sphere, scalar_bar_args={'title': 'Z Position'})
>>> plotter.show()

Static Scene

../../../_images/pyvista-Plotter-add_mesh-1_00_00.png

Interactive Scene

Plot using RGB on a single cell. Note that since the number of points and the number of cells are identical, we have to pass preference='cell'.

>>> import pyvista as pv
>>> import numpy as np
>>> vertices = np.array(
...     [
...         [0, 0, 0],
...         [1, 0, 0],
...         [0.5, 0.667, 0],
...         [0.5, 0.33, 0.667],
...     ]
... )
>>> faces = np.hstack([[3, 0, 1, 2], [3, 0, 3, 2], [3, 0, 1, 3], [3, 1, 2, 3]])
>>> mesh = pv.PolyData(vertices, faces)
>>> mesh.cell_data['colors'] = [
...     [255, 255, 255],
...     [0, 255, 0],
...     [0, 0, 255],
...     [255, 0, 0],
... ]
>>> plotter = pv.Plotter()
>>> _ = plotter.add_mesh(
...     mesh,
...     scalars='colors',
...     lighting=False,
...     rgb=True,
...     preference='cell',
... )
>>> plotter.camera_position = 'xy'
>>> plotter.show()

Static Scene

../../../_images/pyvista-Plotter-add_mesh-1_01_00.png

Interactive Scene

Note how this varies from preference=='point'. This is because each point is now being individually colored, versus in preference=='point', each cell face is individually colored.

>>> plotter = pv.Plotter()
>>> _ = plotter.add_mesh(
...     mesh,
...     scalars='colors',
...     lighting=False,
...     rgb=True,
...     preference='point',
... )
>>> plotter.camera_position = 'xy'
>>> plotter.show()

Static Scene

../../../_images/pyvista-Plotter-add_mesh-1_02_00.png

Interactive Scene

Plot a plane with a constant color and vary its opacity by point.

>>> plane = pv.Plane()
>>> plane.plot(
...     color='b',
...     opacity=np.linspace(0, 1, plane.n_points),
...     show_edges=True,
... )

Static Scene

../../../_images/pyvista-Plotter-add_mesh-1_03_00.png

Interactive Scene

Plot the points of a sphere with Gaussian smoothing while coloring by z position.

>>> mesh = pv.Sphere()
>>> mesh.plot(
...     scalars=mesh.points[:, 2],
...     style='points_gaussian',
...     opacity=0.5,
...     point_size=10,
...     render_points_as_spheres=False,
...     show_scalar_bar=False,
... )

Static Scene

../../../_images/pyvista-Plotter-add_mesh-1_04_00.png

Interactive Scene

Plot spheres using points_gaussian style and scale them by radius.

>>> N_SPHERES = 1_000_000
>>> rng = np.random.default_rng(seed=0)
>>> pos = rng.random((N_SPHERES, 3))
>>> rad = rng.random(N_SPHERES) * 0.01
>>> pdata = pv.PolyData(pos)
>>> pdata['radius'] = rad
>>> pdata.plot(
...     style='points_gaussian',
...     emissive=False,
...     render_points_as_spheres=True,
... )

Static Scene

../../../_images/pyvista-Plotter-add_mesh-1_05_00.png

Interactive Scene

pyvista.Plotter.add_mesh

Contents

pyvista.Plotter.add_mesh#