[Help] Create projective texturing shader

[SDraw]

I tried to create shader that acts same as shadow on low graphic settings, but no luck. Sometimes I get a planar hell or even more weird things.

If you really want (and can) help, please, make possible to set start and end positions of projection for shader via script as 3 dimensional vector (I really can't understand homogeneous coordinates D: )

Edited: found a perfect way for this. If you are interested, just send PM.