Projected Texture Eyes - 7: Iris Texture

Projected Texture Eyes in Blender 2.9, Part 7: Iris Texture
An example Iris texture setup using multiple elements and some tricks.

Projected Texture Eyes is a method where you move the texture across the geometry, instead of moving the geometry itself. I've used this method in most of my characters, including my Reimu and Rei projects. This setup is a convenient group with multiple useful nodes to help you build your own setup, or you can use existing procedural or image textures. Comment, or message me on social media if you need help! (See About page for contact info.)

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Tutorial the Rect to Polar Group comes from:

Blog post:

00:00 - Intro
01:34 - Iris texture components
03:15 - Group setup
03:45 - Procedural sparkles
06:54 - Radial/Polar mapping
12:56 - Using an image texture
17:21 - Inner Iris line
22:56 - Inner line vector mix
25:01 - More cleanup
25:52 - More adjustments
27:56 - Outro

[ardathksheyna]

[6:54] I'm wondering if radial/polar mapping can be used to create zoom-lines as well. Something that I might play around with when I have time.

[SoulDrenor]

[14:58] The only solution to this bug I've been able to find is just duplicating the image texture node and using the alpha from the second node.
Seems like a slightly messy workaround but if you use Ctrl+H to hide any unused outputs/inputs or just collapse the node and hit F2 to rename both of them into "diff/color" and "alpha" then it should be relatively clean. Btw, I reproduced this issue in the lastest LTS version of blender [2.83.13LTS] and 2.92.