I'm wondering if anyone knows either somewhere where I can get a white iris texture, or of a P6 material room node setup to change a color texture for a character's iris into a whte texture without losing much detail.

I'd still like to have the lines and such in the iris, but have the color black and white. And I've tried greyscaling a texture, but it seems to be fairly ininteresting and "flat".

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If you're joking that's just cruel, but if you're being sarcastic, that's even worse.