Since installing poser 12, all of my characters have totally white irises.  This is true even for prior libraries.  Please help.  Thanks

Is it showing like that in preview or rendered? Texture preview settings may be different if former, materials may need tweaking if latter. Also, of latter, which renderer?

This means the characters your using were designed for an older version of Poser. You can still use these figures by choosing the FireFly render engine.

Open the Render preferences by click the Render menu and choosing Render Settings ...

Then switch to the FireFly tab

Then Click Render Now (Firefly)

Making the assumption you are using Superfly to render, another option, if you don't mind dropping into the material room, is to remove the alternate_ diffuse and alternate specular values.  Superfly does not like/understand the alternates and it just bleaches out the material in question.

I'm with Rhia on this one.  Without any additional information from the OP, you're offering a shotgun approach as a solution.  I totally disagree with the alternate_diffuse and alternate_specular channel statement, those connections can be controlled with an HSV2 node or converting the white chip to a greyscale color.   Snarly's EZSkin3 uses those connectors for Superfly renders so there is no validity that Superfly does not like the alternates.

EzSkin 3 usually works fine on older figures, to make them suitable for SuperFly rendering. But if its use then leaves you with great-looking skin but white eye-pupils, then try:-

Material Room > Pupil material > Alternate Diffuse > follow to find its Scatter node > then turn the color there to a very dark grey (almost black).

hborre posted at 7:44 AM Fri, 3 March 2023 - #4457496

I'm with Rhia on this one.  Without any additional information from the OP, you're offering a shotgun approach as a solution.  I totally disagree with the alternate_diffuse and alternate_specular channel statement, those connections can be controlled with an HSV2 node or converting the white chip to a greyscale color.   Snarly's EZSkin3 uses those connectors for Superfly renders so there is no validity that Superfly does not like the alternates.

Sorry should have kept my mouth shut.  Perhaps I missed remembered but I was sure that is what I did when I had the problem when I first started using Superfly but somewhere along the way I converted to using the PhysicalSurface node so white eyes ceased to be and issue.  I remember doing this manually but these days I would use Ken-1171_design's Go Physical script if I wanted to convert old materials.

Don't apologize.  This situation can be a number of problems, from bad shaders to simply switching between SreeD and OpenGL settings.  I predominantly use Cycles and the PrincipledBsdf nodes for all my P12 renders.  It gives me an added benefit of understanding Blender a little better.

All I can say is that I tried to make the old Poser Jessi 'as good as she could be' in 2022 in SuperFly. I used EZSkin to do that. Everything was fine, but her pupils went white. I used the alternate diffuse tweak to have them be a near-black again. It worked. Admittedly, she's a very old figure, so things might be different in later figures.