transform

UnstructuredGridFilters.transform(trans: Union[vtkmodules.vtkCommonMath.vtkMatrix4x4, vtkmodules.vtkCommonTransforms.vtkTransform, numpy.ndarray], transform_all_input_vectors=False, inplace=True, progress_bar=False)

Transform this mesh with a 4x4 transform.

Warning

When using transform_all_input_vectors=True, there is no distinction in VTK between vectors and arrays with three components. This may be an issue if you have scalar data with three components (e.g. RGB data). This will be improperly transformed as if it was vector data rather than scalar data. One possible (albeit ugly) workaround is to store the three components as separate scalar arrays.

Warning

In general, transformations give non-integer results. This method converts integer-typed vector data to float before performing the transformation. This applies to the points array, as well as any vector-valued data that is affected by the transformation. To prevent subtle bugs arising from in-place transformations truncating the result to integers, this conversion always applies to the input mesh.

Parameters
transvtk.vtkMatrix4x4, vtk.vtkTransform, or np.ndarray

Accepts a vtk transformation object or a 4x4 transformation matrix.

transform_all_input_vectorsbool, optional

When True, all arrays with three components are transformed. Otherwise, only the normals and vectors are transformed. See the warning for more details.

inplacebool, optional

When True, modifies the dataset inplace.

progress_barbool, optional

Display a progress bar to indicate progress.

Returns
pyvista.DataSet

Transformed dataset. Return type matches input unless input dataset is a pyvista.UniformGrid, in which case the output datatype is a pyvista.StructuredGrid.

Examples

Translate a mesh by (50, 100, 200).

>>> import numpy as np
>>> from pyvista import examples
>>> mesh = examples.load_airplane()

Here a 4x4 numpy.ndarray is used, but vtk.vtkMatrix4x4 and vtk.vtkTransform are also accepted.

>>> transform_matrix = np.array([[1, 0, 0, 50],
...                              [0, 1, 0, 100],
...                              [0, 0, 1, 200],
...                              [0, 0, 0, 1]])
>>> transformed = mesh.transform(transform_matrix)
>>> transformed.plot(show_edges=True)
../../../_images/pyvista-UnstructuredGridFilters-transform-1_00_00.png