Assign weights from bone envelopes not working with armature in scaled hierarchy #74247

New Issue

Gordon Vart · 2020-02-27T00:32:10+01:00

Gordon Vart commented

2020-02-27 00:32:10 +01:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.19

Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-02-12 16:20, hash: 77d23b0bd7
Worked: (optional)

Short description of error
[Please fill out a short description of the error here]
I am trying to assign way to using envelopes on the bones instead of automatic weight assignment. I set the bone envelope distance to Encompass the mesh area that I'm trying to apply weights to. when I select the option to assign weights to the Bone oh, nothing happens. The same thing happens if I try to parent the entire Armature.

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]
Select the Armature
shift select the mesh
change the weight paint mode
control-click the bone
choose assign weights from bone envelope from the weight menu
expectation is that weights will be applied but they are not

spore5.blend

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.19 **Blender Version** Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-02-12 16:20, hash: `77d23b0bd7` Worked: (optional) **Short description of error** [Please fill out a short description of the error here] I am trying to assign way to using envelopes on the bones instead of automatic weight assignment. I set the bone envelope distance to Encompass the mesh area that I'm trying to apply weights to. when I select the option to assign weights to the Bone oh, nothing happens. The same thing happens if I try to parent the entire Armature. **Exact steps for others to reproduce the error** [Please describe the exact steps needed to reproduce the issue] [Based on the default startup or an attached .blend file (as simple as possible)] Select the Armature shift select the mesh change the weight paint mode control-click the bone choose assign weights from bone envelope from the weight menu expectation is that weights will be applied but they are not [spore5.blend](https://archive.blender.org/developer/F8374163/spore5.blend)

Gordon Vart commented

2020-02-27 00:32:10 +01:00

Added subscriber: @gvart

Philipp Oeser commented

2020-02-28 09:58:09 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-02-28 09:58:09 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Philipp Oeser commented

2020-02-28 09:58:09 +01:00

Confirmed, checking...

Philipp Oeser commented

2020-02-28 10:59:30 +01:00

Well, this has to do with the scale of the whole setup:

Armature is parented to an empty at scale 0.01.
If that scale is applied (I did that to the Empty, the Armature -- beware! scaling an armature does not do this to the Envelope Radii & the Envelope Distance, so you have to do this separately [I did using {key Alt click} on those values and mutiplied by 100]), everything seems to work correctly again:

spore5_scale_applied.blend

Well, this has to do with the scale of the whole setup: - Armature is parented to an empty at scale 0.01. - If that scale is applied (I did that to the Empty, the Armature -- beware! scaling an armature does not do this to the Envelope Radii & the Envelope Distance, so you have to do this separately [I did using {key Alt click} on those values and mutiplied by 100]), everything seems to work correctly again: [spore5_scale_applied.blend](https://archive.blender.org/developer/F8377582/spore5_scale_applied.blend)

Philipp Oeser commented

2020-02-28 11:03:23 +01:00

In this case, I think I have to backflip confirming this, I assume this is not considered a bug...

Philipp Oeser commented

2020-02-28 11:26:23 +01:00

Added subscriber: @dr.sybren

Philipp Oeser commented

2020-02-28 11:26:23 +01:00

Might be related #45493 (Bone Heat weighting: failed (due to none of the vertices in an island being visible to any bones)) as well.
@dr.sybren mentioned this could be added to Animation_Weak_Areas Armatures_and_Negative_Scale

Might be related #45493 (Bone Heat weighting: failed (due to none of the vertices in an island being visible to any bones)) as well. @dr.sybren mentioned this could be added to [Animation_Weak_Areas Armatures_and_Negative_Scale ](https://wiki.blender.org/wiki/User:Sybren/Animation_Weak_Areas#Armatures_and_Negative_Scale)

Philipp Oeser changed title from ~~Assign weights from bone envelopes not working~~ to Assign weights from bone envelopes not working with armature in scaled hierarchy

2020-02-28 11:26:54 +01:00

Philipp Oeser self-assigned this 2020-02-28 12:39:34 +01:00

Philipp Oeser commented

2020-02-28 12:39:34 +01:00

I think the issue here is that in 2.8 we are not displaying the envelope scaled at all. Code [for calculating bone weights] multiplies by obmat, but display doesnt... So the user is fooled into setting up the envelop distances/radii just wrong afaict. Open up this one from 2.79 in both 2.79 and 2.8 to see the difference:

armature_envelope_scaled_279.blend

Lets see if I can fix the display of the envelope...

I think the issue here is that in 2.8 we are not displaying the envelope scaled at all. Code [for calculating bone weights] multiplies by obmat, but display doesnt... So the user is fooled into setting up the envelop distances/radii just wrong afaict. Open up this one from 2.79 in both 2.79 and 2.8 to see the difference: [armature_envelope_scaled_279.blend](https://archive.blender.org/developer/F8377801/armature_envelope_scaled_279.blend) Lets see if I can fix the display of the envelope...

blender-admin commented

2020-02-28 13:36:17 +01:00

This issue was referenced by 3fedfb1526

This issue was referenced by 3fedfb15261a1ae8d5c9920f3d37b83256b36de8

blender-admin commented

2020-02-28 13:36:17 +01:00

This issue was referenced by ee7034949f

This issue was referenced by ee7034949fd8a44e906f26cc18bc30af340c2ab9

Philipp Oeser commented

2020-03-03 09:57:11 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Philipp Oeser closed this issue

2020-03-03 09:57:11 +01:00

Philipp Oeser commented

2020-03-03 09:57:12 +01:00

I have pushed ee7034949f now.
This will bring back the envelope display back to what it should be.

For your file though [in which you set up the envelopes "wrong" visually - because of said bug] that means you have to correct the envelope radii and distance (see above, use {key Alt click} and multiply by 100), or use this file where I did this for you
spore5_corrected.blend

Will close as resolved though, feel free to comment again if issues persist, thx for reporting!

I have pushed ee7034949f now. This will bring back the envelope display back to what it should be. For your file though [in which you set up the envelopes "wrong" visually - because of said bug] that means you have to correct the envelope radii and distance (see above, use {key Alt click} and multiply by 100), or use this file where I did this for you [spore5_corrected.blend](https://archive.blender.org/developer/F8384660/spore5_corrected.blend) Will close as resolved though, feel free to comment again if issues persist, thx for reporting!

Gordon Vart commented

2020-03-04 19:33:58 +01:00

Truly appreciated. You guys are awesome. thanks again, and I will report bugs as I find them. :-)

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Assign weights from bone envelopes not working with armature in scaled hierarchy #74247