Dynamic Runtime Decals

Hi there forums!

I've been pretty stumped recently as I am trying to make a decal system where a decal can be instantiated to an assigned Vector3 coordinate (This has already been done in the code). Currently I just have a plane with the decal texture on that gets instantiated on a certain impact.

What I would like to find out is if there was any way to cull the texture depending on the geometry or at least to stretch across the tri's on the mesh.

I have looked all around and I can not find a solution or plugin that will help.

Thanks in advance, all help is greatly appreciated.