Multires does not maintain corners when applying Crease after Linear and Simple Subdivision methods #81958

New Issue

Alex · 2020-10-22T13:17:55+02:00

Alex commented

2020-10-22 13:17:55 +02:00

System Information
Intel Core 2 Quad, 8 Gb RAM, NVidia GeForce GTX 960 2GB
Windows 7 x64

Blender Version
Broken: 2.91 Beta, 2.92 Alpha
Worked: 2.79

Short description of error
Multires seems to have a very peculiar problem if you apply Crease to edges after subdivision has been done. This doesn't seem to happen if you apply creases before the subdivision. This seems to be happening while using Linear ans Simple subdivision methods.

Exact steps for others to reproduce the error

Create a simple Plane
Apply Multires and make a few subdivisions (Linear or Simple)
Enter Edit Mode and apply Crease 1.0 on all four edges
Exit Edit Mode and Plane's corners will stretch. It looks like the more subdivisions you apply the farther they will stretch.

If you apply Crease on edges before applying Multires it doesn't happen.

**System Information** Intel Core 2 Quad, 8 Gb RAM, NVidia GeForce GTX 960 2GB Windows 7 x64 **Blender Version** Broken: 2.91 Beta, 2.92 Alpha Worked: 2.79 **Short description of error** Multires seems to have a very peculiar problem if you apply Crease to edges after subdivision has been done. This doesn't seem to happen if you apply creases before the subdivision. This seems to be happening while using Linear ans Simple subdivision methods. **Exact steps for others to reproduce the error** 1. Create a simple Plane 2. Apply Multires and make a few subdivisions (Linear or Simple) 3. Enter Edit Mode and apply Crease 1.0 on all four edges 4. Exit Edit Mode and Plane's corners will stretch. It looks like the more subdivisions you apply the farther they will stretch. If you apply Crease on edges *before* applying Multires it doesn't happen. ![MultiresWrongCorners.jpg](https://archive.blender.org/developer/F9034830/MultiresWrongCorners.jpg)

Alex commented

2020-10-22 13:17:55 +02:00

Added subscriber: @SpectreFirst

Germano Cavalcante commented

2020-10-23 04:35:39 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-10-23 04:35:39 +02:00

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

Germano Cavalcante commented

2020-10-23 04:35:39 +02:00

I cannot reproduce this with either the latest stable or current development versions of Blender:

Please try the latest daily build: https://builder.blender.org/download/

Go to File → Defaults → Load Factory Settings and then load your file to see if you still can reproduce this issue.

If the problem persists, please give us more clear instructions on how to reproduce it from scratch.

I cannot reproduce this with either the latest stable or current development versions of Blender: Please try the latest daily build: https://builder.blender.org/download/ Go to File → Defaults → Load Factory Settings and then load your file to see if you still can reproduce this issue. If the problem persists, please give us more clear instructions on how to reproduce it from scratch.

Alex commented

2020-10-23 11:07:57 +02:00

Sorry, I forgot to test all modes so I haven't noticed that this thing happens with Simple and Linear subdivision methods. It's 100% reproducible on 2.9.01 as well as current 2.91 Beta and 2.92 Alpha. I'm always using separate localized versions of Blender for testing so there is no need to reset them. Reproducible with default Cube as well, same exact method as described - add Multires to a Cube, subdivide, enter Edit Mode, select all, apply Crease 1.0, exit Edit Mode.

Sorry, I forgot to test all modes so I haven't noticed that this thing happens with Simple and Linear subdivision methods. It's 100% reproducible on 2.9.01 as well as current 2.91 Beta and 2.92 Alpha. I'm always using separate localized versions of Blender for testing so there is no need to reset them. Reproducible with default Cube as well, same exact method as described - add Multires to a Cube, subdivide, enter Edit Mode, select all, apply Crease 1.0, exit Edit Mode. ![MultiresWrongCorners2901.jpg](https://archive.blender.org/developer/F9046485/MultiresWrongCorners2901.jpg) ![MultiresWrongCorners291.jpg](https://archive.blender.org/developer/F9046510/MultiresWrongCorners291.jpg) ![MultiresWrongCorners292.jpg](https://archive.blender.org/developer/F9046515/MultiresWrongCorners292.jpg)

Alex changed title from ~~Multires does not maintain corners when applying Crease after Subdivision~~ to Multires does not maintain corners when applying Crease after Linear and Simple Subdivision methods

2020-10-23 11:08:47 +02:00

Germano Cavalcante commented

2020-10-23 15:46:00 +02:00

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

Pablo Dobarro commented

2021-01-26 21:26:50 +01:00

Added subscriber: @PabloDobarro

Pablo Dobarro commented

2021-01-26 21:26:50 +01:00

Changed status from 'Confirmed' to: 'Archived'

Pablo Dobarro closed this issue

2021-01-26 21:26:50 +01:00

Pablo Dobarro commented

2021-01-26 21:26:50 +01:00

This is the expected behavior, and it is a consequence of how Multires works.
When you create a simple subdivision in the model without creases, Multires is going to create displacement data on top of top of the current limit surface of the cube. If you change the crease values of the base mesh, you are modifying the limit surface. As the limit surface changed but the displacement info is still the same, the results won't match.

This is the expected behavior, and it is a consequence of how Multires works. When you create a simple subdivision in the model without creases, Multires is going to create displacement data on top of top of the current limit surface of the cube. If you change the crease values of the base mesh, you are modifying the limit surface. As the limit surface changed but the displacement info is still the same, the results won't match.

Hans Goudey referenced this issue

2024-03-12 15:57:58 +01:00

Multires design validation #84864

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Multires does not maintain corners when applying Crease after Linear and Simple Subdivision methods #81958