Baking ambient occlusion gives odd black vortex output?

Question

I am having a very strange problem when I bake an Ambient Occlusion!

The problem is very very visible, When I click Bake, it bakes everything and then in the last few seconds it does this weird "vortex" kind of effect. It always starts from the bottom left.

Also, any UV unwrapping doesn't work either (UV unwrap, Smart uv project etc. all don't work).

enter image description here

Is it possible you could upload your .blend? It looks to me like you have overlapping UVs, which can cause this kind of "z-fighting" — gandalf3, Oct 24 '14 at 19:29
Actually it's not a bug. The baking takes the wire material into account. In the baking options you should tick 'Normalized' (then materials are ignored for the baking), this fixes the problem. — jasperge, Oct 30 '14 at 18:20

gandalf3 · Accepted Answer · 2014-10-30T07:40:50.893

3

For some reason this seems to be caused by the wire material.

If you remove it by pressing the - button:

enter image description here

Then it works as expected:

enter image description here

This looks like a bug to me. ~~You might want to consider reporting it to the tracker.~~ I've since reported it here.

Also note that there are some internal faces and non-manifold geometry in your model, which can also result in some artifacts. Try pressing ⎈ Ctrl⎇ Alt⇧ ShiftM in edit mode to select problem spots.

edited Oct 30 '14 at 07:40

answered Oct 25 '14 at 00:33

gandalf3

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As I said in the comment to the question and in the bug tracker, you can actually just tick 'Normalized' in the bake options. This way materials are ignored when baking and it bakes just fine with a wire material. – jasperge Oct 30 '14 at 18:23

Baking ambient occlusion gives odd black vortex output?

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