Reflections on a curved mirror only work for one row of rays, but fail with a second column

[chbergmann]

Problem description see
https://forum.freecad.org/viewtopic.php?t=59860&start=220#p809729

Switching on the lights will cause a RuntimeError

22:40:52 File "/home/christi/.local/share/FreeCAD/Mod/OpticsWorkbench/./Ray.py", line 558, in traceRay
isec_struct = self.getIntersections(fp, line)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
22:40:52 File "/home/christi/.local/share/FreeCAD/Mod/OpticsWorkbench/./Ray.py", line 385, in getIntersections
dist_to_face = vert.distToShape(face)
^^^^^^^^^^^^^^^^^^^^^^
22:40:52 RuntimeError:

[chbergmann]

The workbench itself is programmed in Python, but it makes use of a C++ library called opencascade. The workbench calculates the intersection points of a ray segment with all faces of all optical objects and picks out the nearest one. vert is one of the intersection points and face is the curved face of a mirror. distToShape() is a call to the opencascade library. It throws an exception. I do not know why. I tried to wrap the call with a try catch block to let the program be continued, but from this point on the calculations for the rays are wrong

[fflipski]

I've redone the CAD file from scratch and now the whole thing works as expected. I guess it comes from my initial geometry but I can't figure out what is different.

https://forum.freecad.org/viewtopic.php?p=811914#p811914

[fflipski]

Well, it didn't last long. after playing more with the same file, it does crash now. It almost looks like the CAD package is getting corrupted of some sort. I am lost here.