Translation not applied for `JupyterViewer.display_face_colormap()`

[meltzerpete]

It seems if a solid is translated, this is not applied when using viewer.display_face_colormap().

from occwl.io import load_single_compound_from_step
from occwl.jupyter_viewer import JupyterViewer
import numpy as np

solid = load_single_compound_from_step('example.step')
viewer = JupyterViewer()
viewer.display_face_colormap(solid, np.zeros(14))
viewer.show()

produces:

And:

offset = np.array([10, 2, 6])

solid2 = load_single_compound_from_step('example.step')
viewer2 = JupyterViewer()
solid2.translate(offset)
viewer2.display_face_colormap(solid2, np.zeros(14))
viewer2.show()

produces:

If I use viewer.display() the translation is applied. I can see that display_face_colormap displays each face separately, whereas display passes though the whole solid, but I have also tried translating each face separately and get the same result. Am I missing something, or is this a bug?

[JoeLambourne]

The function display_face_colormap() is actually looping over the faces of the solid and passing each face to the render function separately. In this case we have a translation set in the solid.topods_shape().Location(), but not transforms on the faces.

In the PythonOCC Jupyter renderer there isn't a way to add a separate color for each face. Also there's no way to pass the transform from the parent solid to the individual faces. We could maybe copy the faces out of the body and transform them.

To apply the transform to the geometry rather than just the solid we should use BRepBuilderAPI_Transform::Perform() with the Copy = True argument