Thanks for the tip.
Tried that but doesn't help .....
Besides, this wouldn't explain why the clickspot visibility depends on the exact eyepoint position in this case.
In any light condition, shifting the eyepoint left and right a bit will hide resp. show the clickspots.
As a sidenote: the zoomfactor, or small fore/aft movement of the eyepoint, has no influence as well.
Bill, I do both polygon button and light (ON/hidden) polygon have same mouse react, for light ( ON/hidden ) I add Visibility. so in the even button polygon covered by light polygon. the light polygon has same mouse react.