Distorted mesh after adding geometry with multires modifier #42028

New Issue

Shane Ambler · 2014-09-30T18:17:36+02:00

Shane Ambler commented

2014-09-30 18:17:36 +02:00

FreeBSD 9.2 amd64 GeForce GT520

Broken: master 30-09-2014 c7694b4

This might be a rare edge case but pretty specific. I would describe it as adding geometry to a mesh object that has a multires modifier causes bad geometry when the new geometry is close to or part of faces with flipped normals and multires alterations.

Steps to produce -

With the default cube enter edit mode and flip the normal on one face - Ctrl-Shift-N
In object mode add a multires modifier and subdivide a few times
In sculpt mode move both flipped normal and non-flipped faces
In edit mode add a loop cut
Enter object mode.

If you subdivide the face opposite the flipped normals (step 4) you don't get any distortion, similar with altering more detailed meshes away from flipped faces, the new geometry needs to be part of or adjacent to the flipped normal face/s and the multires reproduction of the new geometry needs to already be moved within the multires data.

FreeBSD 9.2 amd64 GeForce GT520 Broken: master 30-09-2014 c7694b4 This might be a rare edge case but pretty specific. I would describe it as adding geometry to a mesh object that has a multires modifier causes bad geometry when the new geometry is close to or part of faces with flipped normals and multires alterations. Steps to produce - 1. With the default cube enter edit mode and flip the normal on one face - Ctrl-Shift-N 2. In object mode add a multires modifier and subdivide a few times 3. In sculpt mode move both flipped normal and non-flipped faces 4. In edit mode add a loop cut 5. Enter object mode. If you subdivide the face opposite the flipped normals (step 4) you don't get any distortion, similar with altering more detailed meshes away from flipped faces, the new geometry needs to be part of or adjacent to the flipped normal face/s and the multires reproduction of the new geometry needs to already be moved within the multires data.

Shane Ambler commented

2014-09-30 18:17:36 +02:00

Changed status to: 'Open'

Shane Ambler commented

2014-09-30 18:17:36 +02:00

Added subscriber: @sambler

Greg Zaal commented

2014-10-01 07:41:09 +02:00

Added subscriber: @GregZaal

Sergey Sharybin self-assigned this 2014-10-02 11:25:48 +02:00

Sergey Sharybin commented

2014-10-02 11:25:48 +02:00

Will check a bit later this week.

Sergey Sharybin commented

2014-10-07 12:35:14 +02:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2014-10-07 12:35:14 +02:00

Sergey Sharybin commented

2014-10-07 12:35:14 +02:00

Well, things might be improved here for sure, but currently topology changes with multires requires uniform normals. Otherwise interpolaiton might go totally wrong. There might be a trick to improve things without introducing the slowdown, but wouldn't really consider a bug.

We've got some other issues with topology changes and multires. Goes to my personal TODO list, will try to solve later. Thanks for the report anyway.

Well, things might be improved here for sure, but currently topology changes with multires requires uniform normals. Otherwise interpolaiton might go totally wrong. There might be a trick to improve things without introducing the slowdown, but wouldn't really consider a bug. We've got some other issues with topology changes and multires. Goes to my personal TODO list, will try to solve later. Thanks for the report anyway.

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Distorted mesh after adding geometry with multires modifier #42028