I set the "orient" attribute for the points, it rotates, and passed the points to the StampPoint by copying stamps onto them. The stamps rotate as expected, simulating 3D, but when they turn away from the camera, they disappear and reappear when the front side appears after the rotation. So I can only see them from the front. It doesn't matter if it's a color stamp or monochrome. And they disappear, i.e. the colored background is visible. It's like Backface culling is enabled. It seems strange to me; I've been looking for possible settings, but nothing is working. Isn't it logical for the stamps to be visible on both sides when rotating? Or am I missing something and it can be adjusted somehow?