I want to do some projection mapping, because I have to adjust the perspective of my GEM output to the canvas I am projecting onto. I thought this would be as simple as having a rectangle with a texture on it that I can roteteXYZ until it matches the canvas. But as the projected content is a particle system, I don't really know how to map the particle syste onto the rectangle. Is there any way I can achieve that?

you need to use [gemframebuffer].. see the attached patch.

one tricky bit is that the [translateXYZ 0 0 -4] is necessary when using [gemframebuffer] in order to reset the perspective properly.

http://www.pdpatchrepo.info/hurleur/particle_as_texture.pd

Thanks, that is what I was looking for. Great!

@pd123 said:

you need to use [gemframebuffer].. see the attached patch.

Thanks! Very interesting!