Ambient Occlusion map question

thegreatjmo

Hi,

I tried to bake my ambient occlusion map in maya but the baked texture has dark spot on it. I looked through the internet for tutorial but couldn't find any. Can anybody help me out here please.

Thank you very much.

salman_fas

Did you see this?

thegreatjmo

Yeah. that's the tutorial I used for my AO map. I followed the setting but my always have dark spot on it. I reversed the normal but didn't work too.

Mark Dygert

Overlapping UV pieces?

thegreatjmo

yeah, some of my uv are overlap like missile, is that the reason cause the dark spot?

Baddcog

Yep, overlapping polys are bad for baking AO and normals.

If you are mirroring the tex only bake half of the item, then clone/mirror it. Or put those UV's off the tex area, then move them back after bake.

AnimeAngel

Yah can't have overlapping. if you have similar geomtry that you want to share the same mapping for then Offset them by 1. This will put it outside the UV box but since the texture should tile it should align it on the texture properly and you will get rid of the overlap.

thegreatjmo

Thanks Guys, I fixed the problem. I moved my overlapping out.

Ghostscape

Baddcog wrote: »

Yep, overlapping polys are bad for baking AO and normals.

If you are mirroring the tex only bake half of the item, then clone/mirror it. Or put those UV's off the tex area, then move them back after bake.

Don't do this, you'll get bad smoothing on your normal/AO since your tangent space will be off. Take half of the item and offset the UVs by 1 full unit to keep them out of the 0-1 space instead.