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Maniphest T67797

Shape key + Vertex groups wrong behaviour on value slider
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Description

System Information
Operating system: Windows 10
Graphics card: Nvidia GeForce GTX 680M

Blender Version
Broken: v2.8 RC 2

Short description of error

Assigning vertex groups to shape keys, changes the impact the shape key has on the mesh.

Exact steps for others to reproduce the error

  1. Creat a Base "neutral" shape key on your object
  2. Create a shape key with some deformation
  3. Duplicate the deformation shape key from step 2
  4. Assign a vertex group to the second deformation shape key (from step 3)
  1. The impact from the "value" slider on this last shape key is suddenly much lower then it should be.

Event Timeline

Christophe Swolfs (aschere) created this task.Jul 27 2019, 12:26 PM
ronan ducluzeau (zeauro) added a subscriber: ronan ducluzeau (zeauro).Jul 27 2019, 1:40 PM

I can't reproduce.
Effects of shape keys are added up. There is a possibility of misunderstanding.

Please provide a .blend file.

Christophe Swolfs (aschere) added a comment.EditedJul 27 2019, 5:26 PM

I tried it again with a simple cube and the error is indeed gone.
{F7632070}The error is only present in my specific blend file where I used the rigify addon.


So the first shape key "muscle" applies to the whole body.
The other shape keys are copies of this same morph, but limited to a specific muscle group.
For some reason the strenght has to be much higher on the individual groups to achieve the same result.

Jacques Lucke (JacquesLucke) changed the task status from Unknown Status to Unknown Status.Aug 7 2019, 12:26 PM
Jacques Lucke (JacquesLucke) claimed this task.
Jacques Lucke (JacquesLucke) added a subscriber: Jacques Lucke (JacquesLucke).

I assume this is a bug in the rig since you cannot reproduce it on a simpler example. So I'm closing this (help for fixing rigs should be found on other sites like blenderartists).
When you find a way to reproduce the issue on a smaller example, feel free to create a new bug report.