topic Re: Distorted iris reflection in cornea when rendering eye in Arnold General Rendering Forum

Distorted iris reflection in cornea when rendering eye

beyondthephylum — Tue, 25 Jun 2024 23:37:57 GMT

Trying to recreate the dome like effect eyes have with the iris and cornea as two separate meshes. Even with that, it looks like the iris is being stretched out around the cornea. It looks semi normal from the front, but I'm worried everything I'm seeing in the cornea is being distorted.

Why does this happen?

Re: Distorted iris reflection in cornea when rendering eye

lee_griggs — Wed, 26 Jun 2024 04:35:39 GMT

What specular_IOR value are you using? What does the shader look like?

Re: Distorted iris reflection in cornea when rendering eye

beyondthephylum — Wed, 26 Jun 2024 05:37:59 GMT

spec IOR is set at 1.360

here's my hypershade

ty for the help

Re: Distorted iris reflection in cornea when rendering eye

beyondthephylum — Wed, 26 Jun 2024 15:38:49 GMT

Re: Distorted iris reflection in cornea when rendering eye

lee_griggs — Wed, 26 Jun 2024 16:37:37 GMT

Are the normals ok? Are you able to share a simple scene?

Re: Distorted iris reflection in cornea when rendering eye

beyondthephylum — Wed, 26 Jun 2024 17:57:47 GMT

What exactly would you need? I have it set up as a project

Re: Distorted iris reflection in cornea when rendering eye

beyondthephylum — Wed, 26 Jun 2024 17:59:42 GMT

face normals seem ok

Re: Distorted iris reflection in cornea when rendering eye

lee_griggs — Thu, 27 Jun 2024 09:58:33 GMT

>What exactly would you need? I have it set up as a project

You could File -> Archive the scene or strip it down to just the eyeball and texture that show the issue.

Re: Distorted iris reflection in cornea when rendering eye

beyondthephylum — Thu, 27 Jun 2024 19:29:39 GMT

Stripped down and as an archive it still exceeds the maximum file size allowed for upload, is there another way for you to get it?

Re: Distorted iris reflection in cornea when rendering eye

lee_griggs — Mon, 01 Jul 2024 04:55:47 GMT

You could upload it somewhere else and post the link here.

Re: Distorted iris reflection in cornea when rendering eye

beyondthephylum — Mon, 01 Jul 2024 20:12:15 GMT

nice I didn't know if it was okay or not to use outside links on the forum

here's the file

https://drive.proton.me/urls/K5ERHPQDZM#K7Q7ccfi7bxl

Re: Distorted iris reflection in cornea when rendering eye

lee_griggs — Tue, 02 Jul 2024 11:44:34 GMT

The shading looks right. I get a similar effect with the Emily asset from this angle. Changing the specular_ior reduces the effect but then it isn't physically accurate.

I thought it looked odd, but after googling 'eyeball profile', maybe it's not as strange as it first seems. For example this photo:

Re: Distorted iris reflection in cornea when rendering eye

beyondthephylum — Thu, 04 Jul 2024 16:31:47 GMT

I feel like it depends on the angle; when I've looked at someone's eye from the side, I've seen a bit of a dome effect. Looking at those examples, it really does look like there's some type of distortion going on.

Maybe it wasn't as big of an issue as I thought..... I still want to experiment with adding extra layers to it to see if it creates a better effect.

I've been using images from this photographer as reference

https://www.surenmanvelyan.com/eyes/your-beautiful-eyes/