videle Posted June 3, 2012 Share Posted June 3, 2012 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. colortoparticles.hip Scene.zip Quote Link to comment Share on other sites More sharing options...
bloomendale Posted June 4, 2012 Share Posted June 4, 2012 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. 3ak_colortoparticles.hip Quote Link to comment Share on other sites More sharing options...
videle Posted June 5, 2012 Author Share Posted June 5, 2012 Thank you very much for the clear example, it works perfectly. Quote Link to comment Share on other sites More sharing options...
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