hatrick Posted July 10, 2009 Share Posted July 10, 2009 HI, Is it possible to transfer alpha information as like color from a texture to particles via $BBX$BBZ ? THX Quote Link to comment Share on other sites More sharing options...
sanostol Posted July 11, 2009 Share Posted July 11, 2009 (edited) tex("$HFS/houdini/pic/butterfly1.pic", $MAPU, $MAPV, D_CA) gives You acces to the alpha for example but what exactly do You mean, what way do You want to adapt on the alpha> cheers Martin Edited July 11, 2009 by sanostol Quote Link to comment Share on other sites More sharing options...
hatrick Posted July 11, 2009 Author Share Posted July 11, 2009 i found a solution in the meantime .... i transfer color information from a texture via &BBX,$BBZ D_CR D_CG a.s.o. onto particles i tried to read out the alphainformation from the same file to make spezifik particles transparent controled by the alpha of my image ... for know i go with the delete sop and grouped by D_CA .... that works fine because i only need full opacity and not visible ore deleted .... but how to go when i need semitransparent particles ... is it possible to control that with an alphachannel ? also i ve another question on particles ... very basic... is it possible to somehow multiply the number of particles in renderprocess ... mean how to get a more dens pointcloud that i created in my network ... some kind of interpolation ? thx a lot Quote Link to comment Share on other sites More sharing options...
hatrick Posted July 17, 2009 Author Share Posted July 17, 2009 hello, how i can set up an alphaparmater in vops for a standard constant shader.... i need an constant behavour (texturemap and cameraprojection) and an alphachannel to have opacitycontrol in pop's thx Quote Link to comment Share on other sites More sharing options...
hatrick Posted July 18, 2009 Author Share Posted July 18, 2009 (edited) sorry i missed the material library constant has a point alpha... it was a problem with my values ... but please tell me what's happening here?! The alpha ramp value somehow loops?! ... i ve set a linear ramp for alpha (1 to 0) with the lookup $SPEED thx Edited July 18, 2009 by hatrick Quote Link to comment Share on other sites More sharing options...
anim Posted July 18, 2009 Share Posted July 18, 2009 ...The alpha ramp value somehow loops?! ... i ve set a linear ramp for alpha (1 to 0) with the lookup $SPEED ... yes, it loops and the same for color you need to use clamp($SPEED,0,1) as Lookup if you do not want it to Quote Link to comment Share on other sites More sharing options...
hatrick Posted July 18, 2009 Author Share Posted July 18, 2009 thx for your help anim Quote Link to comment Share on other sites More sharing options...
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