johnLIC Posted May 6, 2013 Share Posted May 6, 2013 What is the best way to hide the emission source in houdini? I'm emitting from a deformed sphere in a pyro setup. Everything looks nice except I'd like to fade on the density or something, instead of seeing the density being emitted. If I was using particles I'd fade on the opacity at the beginning of the life span. What is the "equivalent" in a houdini volume? Or, how to achieve that? Quote Link to comment Share on other sites More sharing options...
ryew Posted May 7, 2013 Share Posted May 7, 2013 I'd suggest playing with the pyro shader settings first Quote Link to comment Share on other sites More sharing options...
copernicusmuffin Posted April 14, 2014 Share Posted April 14, 2014 does anyone know where i could get more info on this? Quote Link to comment Share on other sites More sharing options...
Guest tar Posted April 14, 2014 Share Posted April 14, 2014 VolumeMix node is your friend. Quote Link to comment Share on other sites More sharing options...
eetu Posted April 15, 2014 Share Posted April 15, 2014 (edited) To expound on the oracle - take your emitter, blur, maybe blend in some slowly moving low frequency noise, then multiply your density field with this mask after it's been imported back into SOPs. Alternatively, you could create an "age" field you would advect along with density, and increment each frame. This could be used to create a mask of your liking, and mixed in like above. Never tried this, but might be a fun exercise. Edited April 15, 2014 by eetu 1 Quote Link to comment Share on other sites More sharing options...
eetu Posted April 18, 2014 Share Posted April 18, 2014 To expound on the oracle - take your emitter, blur, maybe blend in some slowly moving low frequency noise, then multiply your density field with this mask after it's been imported back into SOPs. Alternatively, you could create an "age" field you would advect along with density, and increment each frame. This could be used to create a mask of your liking, and mixed in like above. Never tried this, but might be a fun exercise. Ok, here's a simple implementation of an age field for pyro ee_pyro_age_mask.hip 2 Quote Link to comment Share on other sites More sharing options...
copernicusmuffin Posted April 18, 2014 Share Posted April 18, 2014 thank you eetu. why does combustion have to be on? Quote Link to comment Share on other sites More sharing options...
eetu Posted April 20, 2014 Share Posted April 20, 2014 That scene is set up for combustion and is sourcing only fuel and temperature, but no density. Gas resize by default performs the resize based on the density field, so here it shrinks the simulation domain down to nothing. 1 Quote Link to comment Share on other sites More sharing options...
Hello world Posted May 9, 2014 Share Posted May 9, 2014 @eetu what does gaslinearcombination do? Quote Link to comment Share on other sites More sharing options...
eetu Posted May 9, 2014 Share Posted May 9, 2014 @eetu what does gaslinearcombination do? It's one of the basic building blocks, it's used to quickly combine fields in different ways with the basic operators. Quote Link to comment Share on other sites More sharing options...
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