Grease Pencil Armature Deform fails with Envelope Deform #60789
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Reference: blender/blender#60789
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System Information
Operating system: MacOS 10.14
Graphics card: AMD Radeon R9 M395X 4096 MB
Blender Version
Broken: Blender 2.80 beta, jan 23
Short description of error
When using an armature to deform a Grease Pencil object using envelope weights, the GP object fails to deform correctly
Exact steps for others to reproduce the error
Open the following blend file:
GP_bone_envalope_bug.blend
Here you will find simple GP object and an Armature.
The bone envelopes encompass the entire GP object, so the whole shape should be deformed when moving the bones:
However, what happens is that only a few points actually deform when moving or rotating the bones:
If you compare this to a regular mesh object inside the same file, you can see that with a mesh, all points are being moved correctly:
Added subscriber: @WilliamReynish
Added subscriber: @JacquesLucke
Not sure how envelopes are supposed to work but in this example it looks like the issue is that the vertex groups or wrong on the grease pencil object.
Added subscriber: @JoshuaLeung
I have looked at the file and yes, the weights are wrong. If you fix the weights, the armature works.
I'm not an expert in armature deformations (I reused deform functions used in meshes), but IIRC, the deformation needs weights. Maybe @JoshuaLeung can help us here.
I'm not sure what you mean. When you set the armature to use the envelopes, vertex groups are ignored and not used. This is not related to vertex groups. The envelopes feature is meant to use the envelopes, not the weights.
I'm referring to this feature right here:
Even if a mesh has no weights assigned, you can still deform it if you use Bone Envelopes:
This is the feature which seems to be broken for GP objects
@antoniov Is the bug report understood now? As I see it, this is definitely a bug and not an issue with vertex group weights.
Indeed, that seems to be the case. Just the file is a bit misleading because there are vertex groups.
Another bug which is related, is that if you use the envelopes to assign the vertex groups by using Ctrl-P and selecting Bone Envelopes, the weights are not correctly assigned according to the bone envelope sizes.
It could be the same issue? Not sure.
There is a bug (the envelop does not work witout weights) and a missing feature (the Ctrl+P weights is not supported).
Currently, when you use Ctrl+P with envelopes does the same that vertex group.
I'm going first to look at the bug.
Since you can confirm it I'm going to be cheeky and go ahead and set it to confirmed.
Added subscriber: @antoniov
Added subscriber: @lichtwerk
The bug seems to have been fixed
This one is still an issue, not sure if we should call this a missing feature, it is not working as advertised, so either we remove this option for greasepencil, or we call it a bug... going for the latter and have a quick look...
Will also update the report description, since a lot has changed here... maybe even open a separate report for this...
Changed status from 'Confirmed' to: 'Resolved'
Reported the second issue separately #73660 (Greasepencil parent to armature with envelope weights assigns wrong weights).
This way we can close this one.