I’ve been working on a system for generating procedural human irises with geometry nodes.
Here I will be posting some of my WIP tests. I’m also planning on selling the generated assets and maybe the generator too
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Here I’m trying to figure out a way how to shade more transparent types of irises (usually blue and green). In this example it looks ok:
For Brown Irises you just need the principled BSDF shader set to rough with a bit of subsurface scattering and some strong bump or displacement.
But when it comes to the transparent type of Irises you need to play with subsurface scattering, transparency, and a bit of volumes. Getting the right “natural” looking colors is also not very easy and it can start to look stylized very fast.
Another test with a colorful iris. Here I went for a more rare green type.
The shading is procedural and based on masks that are generated by the iris generator:
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This is looking really good! The only thing that looks off is the pupil. I spent some time staring at my own eye in the mirror just now, and I would say that pupils A. don’t have a colored outline, they blend directly into the iris, and B., the outline isn’t a perfect circle. It’s really close to perfect, but there’s a tiny bit of noise around the edge.
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Good observation! I’ll tackle that 
I’ve adjusted the mask generator a bit to allow what you said.
You can now do the type of fade that you were talking about (I put it to a bit of an extreme here but you can tweak it smaller/larger more opaque/less opaque)
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That looks MUCH more realistic, nice work!
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I’m trying to do the shading for my own iris type but it is a bit difficult to make it look right
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nice work, this is going well!
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I think I’m going to do a refactor of the generator because the iris structure doesn’t look good enough for transparent eyes but for that, I will need a few nodes that aren’t out yet so I will put the project on hold and wait for them to be added:
- attribute blur node
- volume nodes
- for loops
I’m expecting these things to be added in a year or so.
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Ya, I’ve got something like that in my fully procedural human. Though, yours is drastically better. Love it. Keep up the great work!
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