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Ambient occlusion problem!

New Here ,
Feb 27, 2024 Feb 27, 2024

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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.

01.JPG02.JPG

TOPICS
Baking , Discussion , UV Tiles

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Adobe Employee ,
Feb 27, 2024 Feb 27, 2024

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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.

Cyril Dellenbach (Micro) | QA Support Artist | Adobe

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New Here ,
Feb 27, 2024 Feb 27, 2024

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Thank you for the reply

 

03.JPG

 

Im using 20 Udim's and directly low poly

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Adobe Employee ,
Feb 28, 2024 Feb 28, 2024

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Do you have by any chance UVs overlapping?

Cyril Dellenbach (Micro) | QA Support Artist | Adobe

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New Here ,
Feb 28, 2024 Feb 28, 2024

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Yes, actually im using Stack in my UVs

 

04.JPG05.JPG

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New Here ,
Mar 01, 2024 Mar 01, 2024

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Thats the problem???

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Adobe Employee ,
Mar 01, 2024 Mar 01, 2024

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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,

Cyril Dellenbach (Micro) | QA Support Artist | Adobe

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New Here ,
Mar 01, 2024 Mar 01, 2024

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

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Adobe Employee ,
Mar 04, 2024 Mar 04, 2024

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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,

Cyril Dellenbach (Micro) | QA Support Artist | Adobe

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New Here ,
Mar 07, 2024 Mar 07, 2024

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Oh ok.Thank you so much

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