Let's say you have a rock geo that drops through a grid that's laid out on the ‘floor’.

As the rock goes through it (in that frame) how can I project the rock shape onto the grid floor texture.

So the shape that the rock mesh interpenetrates with the ground mesh should be projected onto the floor texture for me to export.

* this would be done with multiple objects (let's say multiple rocks at the same time)

If you can point me in the right direction it would be much appreciated.

I hope I'm making sense

Thanks -