Hi everyone, sharing my transpiled version of the MixBox pigment mixing algorithm into Houdini's OpenCL.

The code is based on the OSL version from the original repository because it included the lookup table for evaluating the polynomials right into the code instead of using a texture image which is what the other shader implementations used.

MixBox seeks to solve the issue of inaccurate digital colour blending because colours don't mix by simply lerping RGB values.

I have included my OpenCL code as a header file which you can use in your own kernels or copy paste all the functions inline to use them.

Here's the GitHub repository for the code, instructions on how to use, as well as demo files:
https://github.com/yongsoon-vfx/mixbox-houdini-opencl

And my instagram for some of my other work:
https://www.instagram.com/backface.culling

This one focuses on an Adaptive FACS Pipeline built in Houdini. FACS + 4D cache retargeting across different character shapes, procedural jaw/eye solves and facial corrections.

Some background: i have used houdini part time for ad agencies for about 3 years, then stopped mid 2024. Now i have my own side business that needs some archviz type shots, with some effects (like smoke and particles for product visualizations). I really dont feel like learning max or cinema, as im pretty comfy with houdini. I went through some of the sidefx lessons for solaris/karma, seems pretty good for archviz (at least easier than it was before). Im wondering if im missing something here? Karma render quality? Photorealism? is it all there?

Hey all, I was building a COPS Subnetwork with multiple outputs and I noticed something that may be obvious to you: It always cooks all outputs even if I'm only reading from one, leading to the network getting slow.
Is this intended behaviour or am I missing something?
Thanks!

enabling scatter doesnt affect the sim, while enabling fire and smoke does. After finalizing the look I just navigated to obj level and again when I navigated to solaris scatter stopped working. The 3rd pic is off the look I finalized before navigating to the obj level.

What is the issue?

is this some kind of glitch?

Hey guys,

Problem:

No good recource about shaping your fire in a shader (at least for redshift it seems).

What would be one of the first things you would like to do when shading fire? REMAP and RAMP the values of the TEMPERATURE-Volume as you always do when creating fire simulations in houdini. But it seems to be not possible.

I cant stand why this is not working, it feels super trivial.

I have created this fire sim and wanted to test solaris for this testproject.

Shouldn't this rsrampscalar basically change nothing?

I have also tried feeding in my own color ramp into the emission tint parameter that would be supposed to be driven by the temperature but no luck on that end aswell...

Is there anybody that could help me out here? Would be much appreciated, thanks in advance!!!!