Next I could actually try just using three UV sets and alpha textures, that'll probably work but is inefficient and cumbersome.
Rendering Cd/Polypaint/VertexColor (not particles)
Moderator: juanjgon
Hey! I noticed the posts talking about rendering the particle Cd attribute via packing it in a texture that is now provided with the plugin. I would like to use a similar workflow to render out points with Cd from arbitrary geo nodes and it seems totally doable, I'm just having slight trouble with what to plug where. I got it working for particles, one checkbox & texture assignment is simple enough. But for a polypainted mesh from ZBrush I only got part of the data to Octane via an Attrib Vop and it's mapped wrong as seen in the screenshots below. (Duh, a naive mapping from RGB-->UV leaves out the B component and the R & G values do not match what's in the texture). Any AttribVop/VEX trickery tips to solve this in the meantime until we get OSL and proper attribute support?
Next I could actually try just using three UV sets and alpha textures, that'll probably work but is inefficient and cumbersome.
Next I could actually try just using three UV sets and alpha textures, that'll probably work but is inefficient and cumbersome.
Last edited by limeforce on Wed Aug 03, 2016 9:18 am, edited 2 times in total.
Hmm, for some reason I wanted to tackle the challenge of reverse-engineering the RGB > UV/texture > RGB packing that gives us the ability to render particles via a texture and make it usable for anything that uses Cd. Something that seems very simple to do is made a bit more complex due to inaccuracies in Octanes texture handling and in VOP/VEX precision. Or maybe I've just misunderstood something and chose the long hard way of doing things. Anyways, made some progress, just one weird artefact left.
I just have a creeping feeling that just when I'll be done spending X hours on cracking this, we'll get official support in form of either OSL or juanjgon magic, which will then obsolete my work. But I'm enjoying the math/eng workout either way
Scene file here (Houdini Indie) if someone wants to take a look:
https://dl.dropboxusercontent.com/u/300 ... ngCd.hiplc
If you want to render your polypainted/vertexpainted stuff with crazy banding artefacts you can just copy-paste /obj/geo1/subnet1/attribvop1 from my scene to yours and then in an Octane material (vopnet) use the texture rgb_4k_map.ppm that's in your OctaneForHoudini installation folder (as seen in my first post). I could maybe do a tutorial for that when I get this working properly.
I just have a creeping feeling that just when I'll be done spending X hours on cracking this, we'll get official support in form of either OSL or juanjgon magic, which will then obsolete my work. But I'm enjoying the math/eng workout either way
Scene file here (Houdini Indie) if someone wants to take a look:
https://dl.dropboxusercontent.com/u/300 ... ngCd.hiplc
If you want to render your polypainted/vertexpainted stuff with crazy banding artefacts you can just copy-paste /obj/geo1/subnet1/attribvop1 from my scene to yours and then in an Octane material (vopnet) use the texture rgb_4k_map.ppm that's in your OctaneForHoudini installation folder (as seen in my first post). I could maybe do a tutorial for that when I get this working properly.