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The Cycles Principled BSDF will support dispersion (projects.blender.org)
submitted 2 months ago by to c/blender@lemmy.world
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The patch was accepted and merged to main as of today 2026/08/18

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[–] 2 points 2 months ago (2 children)

I don't usually render dispersion, but the few times I've done it in the past was by mixing several refraction bsdfs with varying IORs and colors. How do you use white noise for the same effect?

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  • [–] 3 points 2 months ago* (1 child)

    I don't usually do dispersion either. I forgot the detail and have to refresh my memory by building it.

    This node setup is a simplified version of method in the video linked below basic dispersion setup

    https://www.youtube.com/watch?v=lEPZ1IUkoB4

    In this video, the author goes into detail as to why using white noise is superior - the dispersed colors are continuous.

    And with this glorious feature update (assuming it will land in 5.3) we can skip all the riggamaroo demonstrated in the video and get even more physically "accurate" result.

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  • [–] 1 point 2 months ago

    Cheers, I'll take a look. From your capture I'm not sure I understand how it would create a continuous rainbow. I would expect homogeneous color noise. I suppose the video answers this

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