Subdivision Surface- Edge Crease - BUG #69251

New Issue

noki paike · 2019-08-28T16:12:48+02:00

noki paike commented

2019-08-28 16:12:48 +02:00

System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: AMD Radeon HD 7600M Series ATI Technologies Inc. 4.5.13417 Core Profile Context 0

Blender Version
Broken: version: 2.81 (sub 3), branch: master, commit date: 2019-08-28 03:44, hash: f88022b96f
Worked: (optional)

Short description of error
in a primitive plane, not subdivided, the outer sides are not influenced by the "edge crease" operator.
this happens even in other conditions with various subdivisions ...
look at the picture.

Exact steps for others to reproduce the error
subsurf_edge_bug.blend

**System Information** Operating system: Windows-10-10.0.18362 64 Bits Graphics card: AMD Radeon HD 7600M Series ATI Technologies Inc. 4.5.13417 Core Profile Context 0 **Blender Version** Broken: version: 2.81 (sub 3), branch: master, commit date: 2019-08-28 03:44, hash: `f88022b96f` Worked: (optional) **Short description of error** in a primitive plane, not subdivided, the outer sides are not influenced by the "edge crease" operator. this happens even in other conditions with various subdivisions ... look at the picture. **Exact steps for others to reproduce the error** [subsurf_edge_bug.blend](https://archive.blender.org/developer/F7707813/subsurf_edge_bug.blend) ![Screenshot (331).png](https://archive.blender.org/developer/F7707812/Screenshot__331_.png)

noki paike commented

2019-08-28 16:12:48 +02:00

Added subscriber: @nokipaike

Marcin Twarowski commented

2019-08-29 09:41:25 +02:00

Added subscriber: @MarcinTwarowski

Marcin Twarowski commented

2019-08-29 09:41:25 +02:00

This has always worked like that. 2.79:

This has always worked like that. 2.79: ![obraz.png](https://archive.blender.org/developer/F7709236/obraz.png)

noki paike commented

2019-08-29 11:56:24 +02:00

already, maybe because of subsurf, but it's still a bug.
because if I want the maximum of the edge crease, it should behave as I say ... instead it ignores the maximum crease ... and some cases it works, in others it doesn't.

if they want to maintain compatibility with the old system, in importing old models, at least they would allow the maximum extension to be reached at "2,000" or "1,500"
the old models will have all parameters that will not go beyond "1,000" of crease

already, maybe because of subsurf, but it's still a bug. because if I want the maximum of the edge crease, it should behave as I say ... instead it ignores the maximum crease ... and some cases it works, in others it doesn't. if they want to maintain compatibility with the old system, in importing old models, at least they would allow the maximum extension to be reached at "2,000" or "1,500" the old models will have all parameters that will not go beyond "1,000" of crease ![crease.gif](https://archive.blender.org/developer/F7709380/crease.gif)

Bastien Montagne commented

2019-08-30 15:51:08 +02:00

Added subscriber: @mont29

Bastien Montagne commented

2019-08-30 15:51:08 +02:00

We do not handle user support on this tracker, only bug reports. User forums like blenderartists.org or blender.stackexchange.com and our devtalk should be used for that matter.

No bug here, that is how subsurf is supposed to work, if you want a vertex to be sharp, then all edges leading to that vertex must have maximum crease…

We do not handle user support on this tracker, only bug reports. User forums like [blenderartists.org](http:*blenderartists.org/) or [blender.stackexchange.com](http:*blender.stackexchange.com/) and our [devtalk](https://devtalk.blender.org) should be used for that matter. No bug here, that is how subsurf is supposed to work, if you want a vertex to be sharp, then all edges leading to that vertex must have maximum crease…

Bastien Montagne commented

2019-08-30 15:51:17 +02:00

Changed status from 'Open' to: 'Archived'

Bastien Montagne closed this issue

2019-08-30 15:51:17 +02:00

Bastien Montagne self-assigned this 2019-08-30 15:51:17 +02:00

noki paike commented

2019-08-31 13:25:41 +02:00

@mont29 better to investigate, I believe there is a bug here, (maximum crease apart) from time to time the creased edge stops working totally.

noki paike commented

2019-09-01 13:25:14 +02:00

Added subscribers: @Sergey, @ideasman42

noki paike commented

2019-09-01 13:25:14 +02:00

@mont29 @Sergey @ideasman42

please do not close this bug report,
it's a bad bug!

@mont29 @Sergey @ideasman42 please do not close this bug report, it's a bad bug! ![abugcazzo.gif](https://archive.blender.org/developer/F7712858/abugcazzo.gif)

Sergey Sharybin commented

2019-09-02 09:53:41 +02:00

This is going down to how subsurf calculates vertex crease: is based on the average crease of an adjacent edges, which is not enough to pull the corner and make it sharp in this case.

Possible workaround is to give a crease to the diagonal edge. That will make the outer corner sharp, but will also affect on the inner loop.

proper solution is to add support of vertex crease, which is now possible with OpenSubdiv. This is a planned work, but is happening as a regular development and not as a bug tracker work.

This is going down to how subsurf calculates vertex crease: is based on the average crease of an adjacent edges, which is not enough to pull the corner and make it sharp in this case. Possible workaround is to give a crease to the diagonal edge. That will make the outer corner sharp, but will also affect on the inner loop. proper solution is to add support of vertex crease, which is now possible with OpenSubdiv. This is a planned work, but is happening as a regular development and not as a bug tracker work.

noki paike commented

2019-09-02 19:41:31 +02:00

@Sergey
thank you very much for the explanation.

good to know that an upgrade is planned ..
because I tried to adopt the modeling similar to BREPs https://en.wikipedia.org/wiki/Boundary_representation , and currently it is not possible to do it as I would like.

@Sergey thank you very much for the explanation. good to know that an upgrade is planned .. because I tried to adopt the modeling similar to BREPs https://en.wikipedia.org/wiki/Boundary_representation , and currently it is not possible to do it as I would like.

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Subdivision Surface- Edge Crease - BUG #69251