Projected textures

[grzegorz.glosny]

Is it possible to project texture on a mesh / particles - the same thing that LightProj does, but with multiply operation instead of addition?

[ulf.schroeter]

At least for meshes you could try projected decals with material settings for blending. I would doubt that there is a way for particles. What effect do you want to achieve ß

[grzegorz.glosny]

I want to project texture on particle cloud. Texture contains black text on transparent background.

[ulf.schroeter]

Don't think this will be possible with standard features. One approach might be to define custom particles material with specialized shader with such kind of special-case texture projection

[manguste]

Grzegorz, it's possible but you'll need to modify an ambient shader for particles (it has to accept an additional texture for modulation). The idea to implement this is as follows:

1. Pass a projection matrix parameter into the particles material via an array material parameter.
   
2. Calculate new texture coordinates, fetch a texture and modulate the particles color in the shader.