models with applied subdivisions bugs mesh #79002

New Issue

Anoca · 2020-07-16T20:05:28+02:00

Anoca commented

2020-07-16 20:05:28 +02:00

Blender Version
2.83.1

Short description of error
Appearently, applying a subdivision modifier on the mesh first, and then applying the automatic weights leads to Bone Heat Weighting failure.
My guess is that there's either something wrong with the subdivision modifier, or the automatic weight system

Exact steps for others to reproduce the error

Import a model which wasn't subdivided
Apply subdivision surface on it
Have a ready armature and use the automatic weights to bind the mesh to the bones

Blender gives you a Bone Heat Weighting error. If you won't apply the subdivision surface on the model FIRST, blender will apply automatic weights with no issues

**Blender Version** 2.83.1 **Short description of error** Appearently, applying a subdivision modifier on the mesh first, and then applying the automatic weights leads to Bone Heat Weighting failure. My guess is that there's either something wrong with the subdivision modifier, or the automatic weight system **Exact steps for others to reproduce the error** 1) Import a model which wasn't subdivided 2) Apply subdivision surface on it 3) Have a ready armature and use the automatic weights to bind the mesh to the bones Blender gives you a Bone Heat Weighting error. If you won't apply the subdivision surface on the model FIRST, blender will apply automatic weights with no issues

Anoca commented

2020-07-16 20:05:28 +02:00

Added subscriber: @Maker26

Joseph Brandenburg commented

2020-07-17 02:39:53 +02:00

Added subscriber: @Josephbburg

Joseph Brandenburg commented

2020-07-17 02:39:53 +02:00

Did you test the mesh before you applied the subdivision surface? Bone Heat Weighting failure shouldn't have anything to do with the resolution of the mesh. The heat computation fails for geometry that is non-manifold or otherwise weird. You will need to provide the .blend file, anyways, so this can be tested.

This does not occur in a simple test case (one bone, default cube before and after subsurf modifier applied). I don't think there is any kind of bug here.

Did you test the mesh before you applied the subdivision surface? Bone Heat Weighting failure shouldn't have anything to do with the resolution of the mesh. The heat computation fails for geometry that is non-manifold or otherwise weird. You will need to provide the .blend file, anyways, so this can be tested. This does not occur in a simple test case (one bone, default cube before and after subsurf modifier applied). I don't think there is any kind of bug here.

Richard Antalik commented

2020-07-17 04:13:01 +02:00

Added subscriber: @iss

Richard Antalik commented

2020-07-17 04:13:01 +02:00

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

Richard Antalik commented

2020-07-17 04:13:01 +02:00

Please upload example file.

Anoca commented

2020-07-17 13:25:35 +02:00

In #79002#980586, @Josephbburg wrote:
Did you test the mesh before you applied the subdivision surface? Bone Heat Weighting failure shouldn't have anything to do with the resolution of the mesh. The heat computation fails for geometry that is non-manifold or otherwise weird. You will need to provide the .blend file, anyways, so this can be tested.

This does not occur in a simple test case (one bone, default cube before and after subsurf modifier applied). I don't think there is any kind of bug here.

I did test it, like I mentioned above, no error occurs if I don't apply any subdivision surface on the mesh. if this doesn't happen on a model made in blender, then does that mean that this only happens on models made in maya and exported into blender? Cause this mesh that I am having trouble binding the weights on is made in maya.

> In #79002#980586, @Josephbburg wrote: > Did you test the mesh before you applied the subdivision surface? Bone Heat Weighting failure shouldn't have anything to do with the resolution of the mesh. The heat computation fails for geometry that is non-manifold or otherwise weird. You will need to provide the .blend file, anyways, so this can be tested. > > This does not occur in a simple test case (one bone, default cube before and after subsurf modifier applied). I don't think there is any kind of bug here. I did test it, like I mentioned above, no error occurs if I don't apply any subdivision surface on the mesh. if this doesn't happen on a model made in blender, then does that mean that this only happens on models made in maya and exported into blender? Cause this mesh that I am having trouble binding the weights on is made in maya.

Joseph Brandenburg commented

2020-07-22 23:16:54 +02:00

No, it makes no difference where the model came from. Please upload an example file.

Richard Antalik commented

2020-07-31 15:14:04 +02:00

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

Richard Antalik closed this issue

2020-07-31 15:14:04 +02:00

Richard Antalik self-assigned this 2020-07-31 15:14:04 +02:00

Richard Antalik commented

2020-07-31 15:14:04 +02:00

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed.

Thanks again for the report. If the problem persists please open a new report with the required information.

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed. Thanks again for the report. If the problem persists please open a new report with the required information.

Nathan Vegdahl referenced this issue

2023-05-09 11:00:26 +02:00

Automatic weights fails with small-scale mesh faces / armatures #84609

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models with applied subdivisions bugs mesh #79002