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First off, I am a complete beginner, and I was following a very high-altitude tutorial. So I expect there is a box that I haven't checked. Here is what I see: Rendered Viewport Material Preview Viewport Material

The model is supposed to look like fabric (a puppet). In the material preview viewport shading, everything looks correct, but if I switch to rendered viewport shading (also with renders), everything with hair on it appears black. The only things I did were to delete all of the starting assets and model the puppet. I have a Nvidia GeForce RTX 3070 and 11th Gen Intel Core i9-11900k processor. I have to assume that's good enough for basic Blender modeling.

I changed the render engine to cycles. I added a couple kinds of lighting back into the scene, which seem to be illuminating the eyes properly. None of the videos or forum posts that I found with similar problems solved my problem. That could just mean I'm missing something very simple.

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Put the IOR back to the default 1.55 (instead of 0) and it seems to work:

enter image description here

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  • $\begingroup$ I can't upvote, but that seems to be the problem. Thanks! $\endgroup$
    – Krozber
    Nov 9, 2023 at 11:37
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    $\begingroup$ @Krozber Just as a quick (possible) explanation: the IOR between two media is calculated as the ratio of the speed of light in one medium to that in another medium. Which means an IOR of 0 would make the speed of light 0 in one medium, hence no light would reach the camera from the surface which makes it black. But of course this is more hypothetical and I don't know how much this actually plays a role in the render engine. $\endgroup$ Nov 9, 2023 at 12:29

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