Unexpected dark area in ShadowsLightsDemo (?)

Development
1

EDIT: Moved topic to the Development category since it’s about one of the official examples. Hope this is OK. Let me know if I should move it back to Support.

Hi folks,

Probably I’m just missing something, but I tried the ShadowsLightsDemo with

curl -O https://gitlab.kitware.com/vtk/vtk-examples/-/raw/master/src/Python/Visualization/ShadowsLightsDemo.py
python3 ShadowsLightsDemo.py

Output

bild
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What is the dark area on the top face of the box? It looks like it ought to be illuminated by the light to the left?

Thanks,
Elvis

2

Actually, also wondering about the little light patch on the belly of the sphere.

bild
bild2690×1526 221 KB

3

Noone else who thinks the lighting looks strange? I tried putting a vtkSphereWidget in and moving it around the scene, but didn’t really get any wiser…

4

Let me know if i should file an issue about this.