Let me describe what I’m looking for: my custom Brep is actually a polysurface. In “normal” mode, when I have any grips off, it’s drawn with Rhino default material like this:
Then, I have my custom grips which allow me to select each of the Brep faces and move them separately. The problem comes with the display: I want to draw the selected face with the selected color material.
I manage to do so by overriding the grips Draw(), but the original Brep polysurface keeps being drawn with default material which overlaps the unit faces, see: