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Maniphest T48205

"Mesh Deform" modifier bugged (won't take into account shape key before binding)
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Description

System Information
Windows 8.1

Blender Version
Broken: 2.77a

Short description of error
You can see read the details in this thread.

Basically, for the past week or so, I've been struggling with trying to use a shape key to fix the problem of a mesh cage not containing the leg geometry of my model. Visual aide:

It was frustrating because I found the shape key fix to be working in any other tests.

Anyways, long story short, I figured out that somehow the specific "Mesh Deform" modifier on my mesh was bugged.
In the end, just deleting it and creating a new instance of the modifier solves the problem.

Problem is that I don't know what caused it to become buggy, so no steps to replicate here.
However, I do have the buggy file, so I'm attaching it in hopes that it'll help in figuring out what went wrong:

MeshDeformCageProblem.blend5 MBDownload

Event Timeline

KiJeon (0o00o0oo) created this task.Apr 20 2016, 7:06 AM
KiJeon (0o00o0oo) raised the priority of this task from to 90.
KiJeon (0o00o0oo) updated the task description. (Show Details)
KiJeon (0o00o0oo) added projects: BF Blender, Modifiers.
KiJeon (0o00o0oo) edited a custom field.
KiJeon (0o00o0oo) added a subscriber: KiJeon (0o00o0oo).
Bastien Montagne (mont29) changed the task status from Unknown Status to Archived.Apr 21 2016, 2:50 PM
Bastien Montagne (mont29) claimed this task.
Bastien Montagne (mont29) added a subscriber: Bastien Montagne (mont29).

Bah, took me some time to find it… You have the 'dynamic bind' option enabled in your meshdeform modifier, which means binding is recomputed everytime (and hence, your 'shapekey' trick is useless). No bug at all here. :)

KiJeon (0o00o0oo) added a comment.Apr 21 2016, 9:32 PM

Well, that's embarrassing.. I thought I checked for that when doing the tests. Sorry for wasting your time, but thanks for checking it out!