Make a hole in object?

Questions & Answers
1

Hello Every One,

I have trying to to this function which is, i have one one plane in the scene using mouse when i click on the plane clicked place should be changed to hole if i keep something on that place it should be go inside that hole. Please help me to do this.

2

you could use a projector to project the hole, use a render texture with a camera if you need a realistic view of the other side.

http://unity3d.com/support/documentation/Components/class-Projector.html

then you could add a raycast from the projector to test for objects (sphere raycast)