Subdivision modifier Apply works wrong #74928

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Sergey · 2020-03-19T16:51:05+01:00

Sergey commented

2020-03-19 16:51:05 +01:00

{F8419608}{F8415984}System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.66

Blender Version
Broken: version: 2.83 (sub 9), branch: master, commit date: 2020-03-17 20:42, hash: dc2df8307f
Worked: (newest version of Blender that worked as expected)

Short description of error
when I apply the deformer, I expect that the deformed geometry will look the same as before.
If I apply one level of subdivision deformer, then add subdivision deformer for another one level, geometry doesn't look like if I add just deformer with two levels of subdivisions.

This is awkward because the common pipeline looks like: make a base shape > subdivide > add mid-level detail >subdivide > add high-level detail. But before subdivision and after I get two different shapes.

Exact steps for others to reproduce the error
1 create two similar objects
2 for the first object add subdivision modifier with subd level 2
3 for the second object add subdivision modifier with subd level 1 and apply it
4 for the second object add subdivision modifier with subd level 1
5 object 1 and 2 should look similar, but they don't

{[F8419608](https://archive.blender.org/developer/F8419608/subdiv.blend)}{[F8415984](https://archive.blender.org/developer/F8415984/subd.jpg)}**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.66 **Blender Version** Broken: version: 2.83 (sub 9), branch: master, commit date: 2020-03-17 20:42, hash: `dc2df8307f` Worked: (newest version of Blender that worked as expected) **Short description of error** when I apply the deformer, I expect that the deformed geometry will look the same as before. If I apply one level of subdivision deformer, then add subdivision deformer for another one level, geometry doesn't look like if I add just deformer with two levels of subdivisions. This is awkward because the common pipeline looks like: make a base shape > subdivide > add mid-level detail >subdivide > add high-level detail. But before subdivision and after I get two different shapes. **Exact steps for others to reproduce the error** 1 create two similar objects 2 for the first object add subdivision modifier with subd level 2 3 for the second object add subdivision modifier with subd level 1 and apply it 4 for the second object add subdivision modifier with subd level 1 5 object 1 and 2 should look similar, but they don't

Sergey commented

2020-03-19 16:51:05 +01:00

Added subscriber: @borschberry

Germano Cavalcante commented

2020-03-20 14:02:42 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-03-20 14:02:42 +01:00

Could you provide a simple file showing the problem?

Ankit Meel commented

2020-03-21 08:52:38 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Sergey commented

2020-03-21 11:31:51 +01:00

File uploaded. In the file two copies of the same geometry. First with subdiv deformer (2 levels). Second with subdiv deformer applied (1 level) and subdiv deformer (1 level)

Campbell Barton commented

2020-03-30 06:34:49 +02:00

Changed status from 'Needs User Info' to: 'Needs Developer To Reproduce'

Jesse Yurkovich commented

2020-04-11 21:11:04 +02:00

Added subscriber: @deadpin

Jesse Yurkovich commented

2020-04-11 21:11:04 +02:00

Not op but it's trivially reproducible, applying the modifier isn't even required. Here's 2 files.

This one shows the 2.8x behavior where the levels seem to mismatch (check wireframes and ortho views to see better)
subd-level-mismatch.blend

This one shows how 2.79 behaved:
subd-level-279.blend

Not op but it's trivially reproducible, applying the modifier isn't even required. Here's 2 files. This one shows the 2.8x behavior where the levels seem to mismatch (check wireframes and ortho views to see better) [subd-level-mismatch.blend](https://archive.blender.org/developer/F8465331/subd-level-mismatch.blend) This one shows how 2.79 behaved: [subd-level-279.blend](https://archive.blender.org/developer/F8465332/subd-level-279.blend)

Ankit Meel commented

2020-04-14 20:15:50 +02:00

Closed as duplicate of #75631

Ankit Meel closed this issue

2020-04-14 20:15:50 +02:00

Ankit Meel commented

2020-04-25 09:25:38 +02:00

Closed as duplicate of #75632

Ankit Meel closed this issue

2020-04-25 09:25:38 +02:00

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