Iridescence Cycles

  • August 02, 2014
  • Blender 2.7x
  • Render: Cycles
  • Creator: Moony
  • License: CC-BY
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I have been experimenting with irridescent like effects in cycles for some time now - and came up with what I believe is a novel approach.

The way this works is to essentially subtract one glossy shader from another by feeding negative RGB values into one of them. This has the effect of forming a glossy halo around any lightsource hitting the object.

By overlaying different coloured versions of this subtracted glossy with different roughness values - you get a rainbow halo effect around glossy reflections.

This trick also works with the anisotripic shader as shown in one of the images (simply replace the glossy nodes with anisotrpoic nodes)


  • docbother profile picture

    Superb! I tried to do the same thing using viewing angle to slightly alter the hue, a quick and dirty approximation that needed tweaking in every scene. This looks more accurate.

    Written August 05, 2014