Is it possible to detect if a object is occluded without using raycasting?

Questions & Answers
1

I have a scene with three boxes where the two are occluding the third. Is there a way to detect how much of the box is occluded by the other two? without using a ray casting or colliders on the other two.

2

Have you tried Renderer.isVisible?

3

@TheReEvolutions yes it seems that if the box is slightly visible then the Renderer.isVisible flag is set to true. What I am interested in how much of the box is occluded by the other two boxes