Difficulty making a color wheel

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While not perfect, I’ve managed to make a near-linear gradient by taking the output of the layer weight node and inputting it into a float curve node.

My final node setup if anyone wants it:

Use this material on an Ico Sphere or UV Sphere (I chose the latter):

image
image1389×838 177 KB

Points on float curve node:
  1. (0, 0) set to Auto Handle
  2. (0.0375, 0.775) set to Auto Handle
  3. (0.125, 0.9) set to Auto Handle
  4. (0.5, 0.9875) set to Auto Clamped
  5. (1, 1) set to Auto Clamped
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