Ambient occlusion problem!

[navid34641540o371]

Hi guys.

When I import my 3d model in Substance 3d painter and bake it, Apparently there is a problem with ambient occlusion.
How can i Fix that?
model in blender and unwrapping in rizomuv, and bake setting was default.

[Cyril Dellenbach]

Hello @navid34641540o371,

Thanks for the message.

Can we have a look at your UVs? Are you using a High Poly model, or are you baking directly with the Low poly?

Let me know.

[navid34641540o371]

Thank you for the reply

Im using 20 Udim's and directly low poly

[Cyril Dellenbach]

Do you have by any chance UVs overlapping?

[navid34641540o371]

Yes, actually im using Stack in my UVs

[navid34641540o371]

Thats the problem???

[Cyril Dellenbach]

It is. When baking, Ambient Occlusion (as instance) is built considering nearby meshes, and it than print the info on the low poly UVs.

Therefore, if two different UV islands are sharing a similar space in the UV map, but the Ambient Occlusion shouln't be similar; the result will not be cohesive, resulting with what you shared in your screenshot.

Regards,

[navid34641540o371]

Oh. So when we can use stack in our UVs?

[Cyril Dellenbach]

In general, I would say never. However, I know how convenient it can be to stack UVs. Therefore, I'd say it is possible to stack UV islands only if you're aware of the baking behavior.

Only stack islands that will share a similar AO and be aware that maps like Position and World space Normal will always have artifacts no matter how you stack UVs.

Regards,

[navid34641540o371]

Oh ok.Thank you so much

[mattrittman]

I too am having this issue:

What's odd is that one of my UV stacks does bake the AO correctly:

Any idea why one works and one doesn't??