haggi Posted April 29, 2009 Share Posted April 29, 2009 Hi, just starting to learn Houdini... again. What I want do create is something like a wetmap. Particles collide with a surface and at this position a color is created and stays there. From several tutorials I know how to color a surface with the help of a attribute transfer. I let my particles collide with a surface and with a attributeTransfer operator I copy my particle color to the surface. But as soon as the particles go away, the color vanishes. But I want the color to stay once it it set. Any ideas how to archive this? Basic scene is attached. Thanks wetmap.hipnc Quote Link to comment Share on other sites More sharing options...
SpencerL Posted April 29, 2009 Share Posted April 29, 2009 Hi,just starting to learn Houdini... again. What I want do create is something like a wetmap. Particles collide with a surface and at this position a color is created and stays there. From several tutorials I know how to color a surface with the help of a attribute transfer. I let my particles collide with a surface and with a attributeTransfer operator I copy my particle color to the surface. But as soon as the particles go away, the color vanishes. But I want the color to stay once it it set. Any ideas how to archive this? Basic scene is attached. Thanks you need to create a feedback loop. I think there is a DOP example file which uses a sop solver to transfer color and keep the color once it is transferred. Quote Link to comment Share on other sites More sharing options...
johner Posted April 30, 2009 Share Posted April 30, 2009 (edited) From several tutorials I know how to color a surface with the help of a attribute transfer. I let my particles collide with a surface and with a attributeTransfer operator I copy my particle color to the surface. But as soon as the particles go away, the color vanishes. But I want the color to stay once it it set. This thread has some ideas about how to accumulate with AttributeTransfer as well. Edited April 30, 2009 by johner Quote Link to comment Share on other sites More sharing options...
Jason Posted April 30, 2009 Share Posted April 30, 2009 This thread has some ideas about how to accumulate with AttributeTransfer as well. Here is an easy method - I just threw this together from something I've used a lot in the past: http://www.sidefx.com/exchange/info.php?fi...p;versionid=613 Quote Link to comment Share on other sites More sharing options...
pclaes Posted April 30, 2009 Share Posted April 30, 2009 Thanks for this Jason! Very useful and compact. Quote Link to comment Share on other sites More sharing options...
pclaes Posted May 1, 2009 Share Posted May 1, 2009 (edited) That tool inspired me to try and work on an erosion effect: I think I'm going to start using to sop solver a lot more from now . - it's a bit fragile to get it to work, but once it's working it's pretty sweet. - next I'm going to link it in with shaders and tweak it a bit more. particle_erosion_12.hipnc blast_02.avi Edited May 1, 2009 by pclaes Quote Link to comment Share on other sites More sharing options...
haggi Posted May 1, 2009 Author Share Posted May 1, 2009 Thanks a lot. The Feedback node helps as lot as soon as you know how to use it. Fortunatly I could find an example here: http://forums.odforce.net/index.php?showto...amp;hl=feedback Works fine. Quote Link to comment Share on other sites More sharing options...
bunker Posted May 2, 2009 Share Posted May 2, 2009 I personally use particles to achieve this effect. have a look ... cheers, Julien color_transfer_acc.hipnc Quote Link to comment Share on other sites More sharing options...
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