matt Posted April 11, 2012 Share Posted April 11, 2012 I've done a bit of experimenting, and implemented some VOPs which can be used to generate and evaluate spherical harmonics inside a VOP net. I've written up some info on what this is all about here: http://mattebb.com/weblog/spherical-harmonics-in-vops/ and you can download the OTL and a hip here: http://mattebb.com/projects/houdini/houdini_sh_otl_hipnc.v001.zip Or just check the video - hope it's understandable! I have ideas for some more more practical usage for these tools in mind, will update here if I can get time to do it! Quote Link to comment Share on other sites More sharing options...
Erik_JE Posted April 11, 2012 Share Posted April 11, 2012 Very nice work. I always had a hard time grasping spherical harmonics. Gonna skim the paper later. Quote Link to comment Share on other sites More sharing options...
DeeJ Posted April 11, 2012 Share Posted April 11, 2012 Very cool! Great to see it working interactively. Thanks for sharing! Quote Link to comment Share on other sites More sharing options...
eetu Posted April 11, 2012 Share Posted April 11, 2012 That's really sweet, and potentially useful for other things as well. Thanks! Quote Link to comment Share on other sites More sharing options...
tjeeds Posted April 11, 2012 Share Posted April 11, 2012 Hell yes! Great to see this hit the light of day man. You should cross post on the Side Effects forum too. Quote Link to comment Share on other sites More sharing options...
ikarus Posted April 11, 2012 Share Posted April 11, 2012 This is fantastic! Quote Link to comment Share on other sites More sharing options...
aghourab Posted April 11, 2012 Share Posted April 11, 2012 Awesome work. Must have had a fun time wrapping your head round the SH maths:p Quote Link to comment Share on other sites More sharing options...
matt Posted April 11, 2012 Author Share Posted April 11, 2012 Thanks! Jesse: Yeah, took sweet time I know, but finally... eetu: There are lots of things it can be useful for - I saw the blog of a Maya char TD who was using SH to mix several different 0blend shapes based on the angle between bones. Anything that involves values that vary by angle! aghourab: Well, I understand the concepts but not really the detailed math The code is mostly this paper translated into VEX: http://www.cs.columbia.edu/~cs4162/slides/spherical-harmonic-lighting.pdf Quote Link to comment Share on other sites More sharing options...
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