Armature + sculpt : is this normal?

Support Modeling
#1

Hi,

I’d like to use multires and sculpt simply to fix skinning problems when changing pose, not even for shape animations.

Sometimes it works, but here it only works until I move a bone again and then I get this… was it to be expected or should I submit a bug?

Thanks!

http://www.absurdus.net/images/sculptbug.jpg
sculptbug.jpg670×1000

#2

I’m not sure what you mean when you say 'not even shape animations"
You’re making a new shape key for the new sculpt right?

#3

No, just sculpting directly, modifying permanently the mesh.

I’ve tried shapes, but in 2.53 they’re simply not recorded when in sculpt mode.

#4

Are you using envelopes at all in your armature modifier? Did you parent the mesh to the armature using bone heat?

I can’t really think of much else that would cause that kind of problem if your mesh doesn’t have any shape keys.

#5

Yes, I used bone heat. No envelopes. The result is vertex groups skinning.

Does that make you think of anything?

In summary:

  • attach mesh to bones with bone-heat
  • Add multires
  • Subdivide
  • Pose armature
  • Sculpt to adjust skinning problems
    until now everything works
  • change pose : boom!

Thanks.

#6

To make it short, yes that is normal. It’s called crazy space, the vertices are transformed in their mix of bone spaces. There is a script called anisculpt that lets you model shapes and apply them without crazy space. Maybe you can bake the shape afterwards.

#7

“crazy space” eh?

I tried to reproduce the problem with a simpler model without success.

Is there a condition for it happen, like vertices attached to more than one bone? Is it possible to force a model to have only one bone attached to each vertex?

Thanks a lot.

Jonathan

#8

I don’t know what’s wrong with the rig but the anisculpt script gives even worse results!

Anyways, I guess I’ll have to find a new workflow.

#9

Ok. The script works without Multires. I guess I can live without it if I subdivide the original mesh enough for my purpose.

#10

Now this is just my opinion and sometimes ppl are very negative to my opinions, but I think it’s your workflow. You attach a mesh to an armature with bone-heat, you add Multires…modifier…I assume? Then you subdivide the mesh? So my thoughts are, if you’ve created new geometry… has it been bound to bones with weight paint? Vertex groups?

Randy

#11

I meant that I subdivided from within the Multires modifier. I assume the vertices generated by multires inherit properties (like weight) from the original vertices.