[Solved] Baked Occlusion All Black

[alvordr]

For some reason I sometimes get baked occlusion coming out all black. Is there something I need to do or undo to fix this?

[ajz3d]

You mean it sometimes bakes successfully and sometimes doesn't for a single model?

[alvordr]

Yes.

[ajz3d]

The first thing that comes to my mind is ray casting length set to a far too great number. This theoretically could result in blackness if model is of small scale.

It might be also inverted normal vectors, but if you're able to paint on the model then you can scratch that, I think.

Also, perhaps the model doesn't have UVs?

Other than that, I don't know.

[alvordr]

It's probably the ray casting. I set it to 15.

[alvordr]

I still don't know why this happens sometimes.

[Carlosan]

which shader base do you use for baking ?

[alvordr]

Picmat_Carpaint. But I used it for other objects in that very scene that worked fine.

I eventually just rebaked with different projection settings. I bet it was a cage thing.

[alvordr]

After some experimentation, I've found it's the rays and bake settings. Sounds reasonable, but I had to test it. Your rays need to be able to "fit" inside the inner and outer bake. It's not necessarily what you might think. For my scene, my inner was 1.5 and outer was 3 and my rays were put at 10. Before that the rays were at 20 and I got all black. Hope this helps.