I have an actor with point normals, and I want to mirror it in X and Y directions. My approach is illustrated in attached python script mirroring.py (1.6 KB)
shows two of the mirrors in black instead of the assigned colors. When I do not generate normals, the colors are OK. I suppose this is due to the normals now pointing inside instead of outside, or the cells having their orientation reversed? When I add a vtkReverseSense to the X and Y mirrors, the image looks OK
Is there a method to have the transform fix the normals without having to use vtkReverseSense?
Thanks for your help!
To position your actor, you can use origin, scale, and orientation properties of the actor.
As far as I know, UserTransform in the actor is a very low-level API. If you use us then you are expected to take care of all consequences. UserMatrix might work a bit better.
To VTK developers: It would be nice if VTK documentation would clarify what is expected when someone modifies an actor’s UserTransform or UserMatrix.
Please open an issue for this; it’s just going to get (more ) lost here on Discourse.
Added an issue for improving documentation of these methods - https://gitlab.kitware.com/vtk/vtk/issues/17807