2 replies to this topic

[videle]

I am having difficulty controlling the emission of particles from a surface textured with an image. I would like to suppress the emission of particles from points of the surface where the alpha is zero i.e. the transparent.

I have found several threads where texture based particle emission is discussed. Unfortunately none of these threads discuss how to suppress the emission of particles based on alpha.

Nevertheless, I've attached a small scene illustrating my attempt.

Thanks.

Attached Files

•  colortoparticles.hip   243.2K   21 downloads
•  Scene.zip   241.5K   14 downloads

[bloomendale]

videle, on 03 June 2012 - 02:40 PM, said:

I am having difficulty controlling the emission of particles from a surface textured with an image. I would like to suppress the emission of particles from points of the surface where the alpha is zero i.e. the transparent.

I have found several threads where texture based particle emission is discussed. Unfortunately none of these threads discuss how to suppress the emission of particles based on alpha.

Nevertheless, I've attached a small scene illustrating my attempt.

Thanks.

Hi
1) Mandril.pic seems to be without Alpha so i used intensity (length(color)) to mimic it otherwise it would be 1 everywhere.
2) You need to promote Alpha attrib to primitives (i used average) cause you're emitting from them (and use Emission type = Surfaces (attribute) in Source POP.

Attached Files

•  3ak_colortoparticles.hip   291.2K   23 downloads

[videle]

Thank you very much for the clear example, it works perfectly.