Michael1 Posted February 22, 2009 Share Posted February 22, 2009 I have a POP network in which I have a colour node which uses $LIFE in the 'Lookup' section to control a colour ramp to change the colour of the particles in their lifetime. This works fine, I then have another colour node which has $LIFE controlling an Alpha ramp, which should fade out the alpha in the lifetime. This does not work, I'm stumped as to why it doesn't work. Both nodes have $LIFE in the look up, the only difference is that one is affecting the colour ramp, the other a alpha ramp. Any ideas? Quote Link to comment Share on other sites More sharing options...
mangi Posted February 22, 2009 Share Posted February 22, 2009 I have a POP network in which I have a colour node which uses $LIFE in the 'Lookup' section to control a colour ramp to change the colour of the particles in their lifetime. This works fine, I then have another colour node which has $LIFE controlling an Alpha ramp, which should fade out the alpha in the lifetime. This does not work, I'm stumped as to why it doesn't work. Both nodes have $LIFE in the look up, the only difference is that one is affecting the colour ramp, the other a alpha ramp.Any ideas? Try this in the Lookup $F / $NFRAMES Not sure what you are after it helps if you leave a hip to play around with the POP you made. Quote Link to comment Share on other sites More sharing options...
storyteller Posted February 23, 2009 Share Posted February 23, 2009 (edited) Maybe a silly question, but does your shader support "Alpha" values ? POP_Alpha.hipnc Edited February 23, 2009 by storyteller Quote Link to comment Share on other sites More sharing options...
Michael1 Posted February 23, 2009 Author Share Posted February 23, 2009 No it didn't, I solved the problem this morning, it just took a long time. I was so confused as to why colour was working by alpha wasn't. Thanks for your reply. Maybe a silly question, but does your shader support "Alpha" values ?POP_Alpha.hipnc Quote Link to comment Share on other sites More sharing options...
pclaes Posted February 23, 2009 Share Posted February 23, 2009 For anyone who might need to do something similar, this is what we did: Basically the lookup of the color and alpha of the particles is now done (in Michael's file) outside of the pop network by feeding the $LIFE into the shader. This way the pop network doesn't need to be re-simulated. $LIFE is the normalized age which is then used to drive some ramps in the shader. Quote Link to comment Share on other sites More sharing options...
alpotnis Posted February 24, 2009 Share Posted February 24, 2009 For anyone who might need to do something similar, this is what we did:Basically the lookup of the color and alpha of the particles is now done (in Michael's file) outside of the pop network by feeding the $LIFE into the shader. This way the pop network doesn't need to be re-simulated. $LIFE is the normalized age which is then used to drive some ramps in the shader. hi pclaes...is it possible for you to put up the .hip file. The POP_Alpha.hipnc file whic is posted, uses the color sop to play with the alpha. Quote Link to comment Share on other sites More sharing options...
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