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Maniphest T75631

New multires shrinkage problem
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Description

System Information
Operating system: ubuntu 16.04
Graphics card:

Blender Version
Broken: newest master, a8d139ca2002
Worked: older version / 2.7x

Short description of error
subdividing with a multires modifer will result in a "non standard" catmull clark mesh

Exact steps for others to reproduce the error

just subdivide a cube and compare it to a subsurf cube

the reason for that behavior is (i guess) multires subdivides the limit surface mesh again and again which is obviously wrong/unpredictable... (it is exactly reproducible with multiple subsurf modifier on one mesh)

Related Objects

Event Timeline

Ronny G (nutel) created this task.Apr 11 2020, 8:40 PM
Ronny G (nutel) updated the task description. (Show Details)Apr 11 2020, 8:44 PM
Tonatiuh de San Julián (Tonatiuh) mentioned this in T75632: Subsurf modifier and multirres modifier give different results when subdivide.Apr 11 2020, 8:58 PM
TheRedWaxPolice (TheRedWaxPolice) added a subscriber: TheRedWaxPolice (TheRedWaxPolice).Apr 11 2020, 9:00 PM

I can confirm this issue.
2.82 and even 2.79 both doesn't have this problem...

Ronny G (nutel) added projects: Sculpt, Paint & Texture, Modifiers.Apr 11 2020, 9:32 PM
Ronny G (nutel) updated the task description. (Show Details)Apr 11 2020, 10:29 PM
Chris Kohl (ckohl_art) added a subscriber: Chris Kohl (ckohl_art).Apr 12 2020, 12:14 AM
ThinkingPolygons (ThinkingPolygons) added a subscriber: ThinkingPolygons (ThinkingPolygons).Apr 13 2020, 3:44 PM

I can reproduce this as well.
Big issue.

ThinkingPolygons (ThinkingPolygons) mentioned this in T75697: Multires modifier produces rounded corners with 'Simple' subdivision mode.Apr 14 2020, 12:19 AM
Ankit Meel (ankitm) merged a task: T74928: Subdivision modifier Apply works wrong.Apr 14 2020, 8:15 PM
Ankit Meel (ankitm) merged a task: T75632: Subsurf modifier and multirres modifier give different results when subdivide.
Ankit Meel (ankitm) added subscribers: Sergey (borschberry), Jesse Y (deadpin), Germano Cavalcante (mano-wii).
Ankit Meel (ankitm) added a subscriber: Tonatiuh de San Julián (Tonatiuh).
Ankit Meel (ankitm) added a subscriber: Ankit Meel (ankitm).Apr 14 2020, 8:19 PM
Enrique Barranco (ebarranco) added a subscriber: Enrique Barranco (ebarranco).Apr 14 2020, 8:33 PM
Ankit Meel (ankitm) changed the task status from Needs Triage to Confirmed.Apr 15 2020, 8:13 AM
ThinkingPolygons (ThinkingPolygons) added a comment.Apr 23 2020, 3:04 PM

Any news on a fix for this?
I suppose it should be fixed for 2.83?

Germano Cavalcante (mano-wii) added a subscriber: Sergey Sharybin (sergey).Apr 23 2020, 4:20 PM
Dalai Felinto (dfelinto) added a subscriber: Dalai Felinto (dfelinto).Apr 23 2020, 5:28 PM

@ThinkingPolygons (ThinkingPolygons) I appreciate your enthusiasm, but please stick to discussing about fixing or reproducing the issue here. Since you are subscribed to this task you will already receive notifications about a fix when it comes to that.

ThinkingPolygons (ThinkingPolygons) added a comment.Apr 23 2020, 5:34 PM

It felt forgotten, that's why I asked.
But don't worry, it won't happen again.

ThinkingPolygons (ThinkingPolygons) removed a subscriber: ThinkingPolygons (ThinkingPolygons).Apr 23 2020, 5:35 PM
Pablo Dobarro (pablodp606) added a subscriber: Pablo Dobarro (pablodp606).Apr 23 2020, 5:37 PM
Sergey Sharybin (sergey) mentioned this in rB4542b50afcfc: T75631: New multires shrinkage problem.Apr 24 2020, 10:40 AM
Sergey Sharybin (sergey) closed this task as Resolved.Apr 24 2020, 10:42 AM
Sergey Sharybin (sergey) claimed this task.

The Fix prefix in the commit message got lost. So markign as resolved manually.
Thanks for the report!

Nelson (NAS) added subscribers: ThinkingPolygons (ThinkingPolygons), Nelson (NAS).Apr 24 2020, 3:12 PM
In T75631#916310, @ThinkingPolygons (ThinkingPolygons) wrote:

It felt forgotten, that's why I asked.

And I'm glad you did ask. The issue is now fixed! Yay

Dalai Felinto (dfelinto) added a comment.Apr 24 2020, 7:39 PM

@Nelson (NAS) I know you have good intentions, but please refrain from encouraging this behaviour any further. And from doing it yourself - T75325#905524.

This affect negatively the development process. It adds pressure to developers, and often lead to non-priority items taking over the agenda.

I consider this topic over. If anyone wants to discuss this any further please write me on dalai@blender.org.

Nelson (NAS) added a comment.Apr 24 2020, 8:15 PM

@Dalai Felinto (dfelinto) Well, I'm not encouraging anything, also I don't see anything wrong about asking for information on tasks/patches that seems to be forgotten, but if you think this is bad, then so be it!