akirasun Posted December 2, 2010 Share Posted December 2, 2010 Hi there everyone What I want to do is try to emitting particles from a object that textured by a Ramp Shader , and the particles will be emitted from while white area pass through. I assume the “vopsop” or “attribcreate” can help to achieve that , but I'm completely new to houdini , even I spent a lot of time for searching document and old posts, try to figure out which expression or VEX node that can do this. I have tried such like “ch() , shopstring() , pic() and etc...” , but still get stuck Appreciate for any suggestion or help. Thanks in advance. textureMapping_01.hipnc Quote Link to comment Share on other sites More sharing options...
Macha Posted December 2, 2010 Share Posted December 2, 2010 Try this. I suppose you could drive the vop ramp with channels that you reference from the material but I think this way may be easier. textureMapping_01.hipnc Quote Link to comment Share on other sites More sharing options...
akirasun Posted December 2, 2010 Author Share Posted December 2, 2010 Try this. I suppose you could drive the vop ramp with channels that you reference from the material but I think this way may be easier. Thanks a lot , even inspired me that have a other way to achieve this effect by using channel reference , I will try it later. That's really helped me Quote Link to comment Share on other sites More sharing options...
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