cwalrus Posted April 21, 2016 Share Posted April 21, 2016 Hello - I have a smoke sim that takes a long time to render. I need to render the smoke's beauty pass, and then its shadow on the ground, separately. I have the ground set up with a shadow matte, working nicely.. Now I'm stuck. I either need to : 1- set up an AOV with an image plane that isolates the shadow and / or the smoke by itself - which I don't know how to do. (as it is now, the shadow's alpha lives in the primary alpha channel, combined with the smoke's alpha) or 2- set up two separate Mantra nodes, with the respective objects specified. The problem is, I believe that will take literally twice as long to render - is that the case? Would Houdini have to render the entire thing twice, or is there some magic in ROPs that fixes this? thanks for any suggestions! Quote Link to comment Share on other sites More sharing options...
alksndr Posted April 21, 2016 Share Posted April 21, 2016 You can get the smoke itself with an AOV, see attached. This has the combined shadow of smoke and ground, but perhaps you can mask out the smoke from that pass. untitled.hip Quote Link to comment Share on other sites More sharing options...
cwalrus Posted April 21, 2016 Author Share Posted April 21, 2016 Thanks for this - But it doesn't solve the problem. None of those AOV's isolate the shadow by itself... Unless I'm missing something... Anyone? Quote Link to comment Share on other sites More sharing options...
Guest tar Posted April 21, 2016 Share Posted April 21, 2016 Quote Link to comment Share on other sites More sharing options...
cwalrus Posted April 21, 2016 Author Share Posted April 21, 2016 Thank you Marty! Perfect. Quote Link to comment Share on other sites More sharing options...
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