Multires Displacement Bake creates ripples for each subidived face #31984

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opened 2012-07-01 23:43:09 +02:00 by Tobias Oelgarte · 3 comments

%%%I just tried to bake Displacement for Multires Level 4 to Multires Level 1 (Render). The result shows bumpy displacement (screenshot number 1), for each face, as if every face is sphere or something like this - a goose bump pattern. It does happen on every level (for example Level 2 to Level 1), but may be less noticeable. In screenshot number 2 you see Level 3 to Level 1. It looks much better but is also wrong. The dark valleys aren't there in the model.

I appended the example file to illustrate the issue and to play with. Just press bake and see what happens. ;-)

My System: Ubuntu 10.10 32 Bit, r48394%%%

%%%I just tried to bake Displacement for Multires Level 4 to Multires Level 1 (Render). The result shows bumpy displacement (screenshot number 1), for each face, as if every face is sphere or something like this - a goose bump pattern. It does happen on every level (for example Level 2 to Level 1), but may be less noticeable. In screenshot number 2 you see Level 3 to Level 1. It looks much better but is also wrong. The dark valleys aren't there in the model. I appended the example file to illustrate the issue and to play with. Just press bake and see what happens. ;-) My System: Ubuntu 10.10 32 Bit, r48394%%%

Changed status to: 'Open'

Changed status to: 'Open'

%%%The only issue i can see here baking from highest level to highest level behaves strange in cases when low resolution mesh is disabled -- it shall produce black image in fact because there's no difference between mesh you're baking from and mesh you're baking to. It was fixed in svn rev48480.

In other cases i can't see what behaves wrong. There indeed could be some ripples in sculpted areas, but that's not a bug in baking, it's about how multires baker is working and how it's results are supposed to be used.

It bakes from highest level to preview level. Highest level contains all multires subdivisions and sculpted displacement. If you're baking with Low Resolution Mesh enabled, then baking would happen against multires preview level which contains sculpted data for that level. In this case ripples would really be noticeable, but that's only because of differences in curvature of low and high resolution mesh which is in this case correct. In this case displacement map should be applied on a mesh which was created from multires preview subdivisions level and result shall be pretty close to original.

If you're baking with Low Resolution Mesh disabled, then multires preview level would be subdivided further to match highest multires level. This subdivisions are like applying SubSurf modifier, without applying sculpted details for extra levels added. In this case ripples could be noticed in sculpted areas because of difference in curvature again (brushes are changing it). It's also no a bug. And in this case displacement map shall be applied on subdivided mesh created from multires preview level and in this case result should be very much close to original mesh.

Thanks for the report, but currently it's not a bug, just some possible misunderstandings of how multires baking works. Closing now.%%%

%%%The only issue i can see here baking from highest level to highest level behaves strange in cases when low resolution mesh is disabled -- it shall produce black image in fact because there's no difference between mesh you're baking from and mesh you're baking to. It was fixed in svn rev48480. In other cases i can't see what behaves wrong. There indeed could be some ripples in sculpted areas, but that's not a bug in baking, it's about how multires baker is working and how it's results are supposed to be used. It bakes from highest level to preview level. Highest level contains all multires subdivisions and sculpted displacement. If you're baking with Low Resolution Mesh enabled, then baking would happen against multires preview level which contains sculpted data for that level. In this case ripples would really be noticeable, but that's only because of differences in curvature of low and high resolution mesh which is in this case correct. In this case displacement map should be applied on a mesh which was created from multires preview subdivisions level and result shall be pretty close to original. If you're baking with Low Resolution Mesh disabled, then multires preview level would be subdivided further to match highest multires level. This subdivisions are like applying SubSurf modifier, without applying sculpted details for extra levels added. In this case ripples could be noticed in sculpted areas because of difference in curvature again (brushes are changing it). It's also no a bug. And in this case displacement map shall be applied on subdivided mesh created from multires preview level and in this case result should be very much close to original mesh. Thanks for the report, but currently it's not a bug, just some possible misunderstandings of how multires baking works. Closing now.%%%

Changed status from 'Open' to: 'Archived'

Changed status from 'Open' to: 'Archived'
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Reference: blender/blender#31984
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