Weird deformation of lower arm in pose mode

[FedPete]

I you can find a way to upload (google dropbox), we (I) can look into it.

[FedPete]

You can search on the ganmedev.tv forums

Rotating bones deforms meshes

Hi! I made everything exactly as in thr video, but when I rotate a bone my upper and lower arms attached to, meshes change their length and shape. Why is this happening?

[NP5]

It would seem logical if the mesh is deforming it is related to the weight painting. Or it might be that there is some influence of a different bone on the ones being moved. Again a weight painting issue in effect.

Given it is a simple set up Why not just delete the armature and redo it? Following the lectures carefully.

[Robert_Peary]

Ok, so I redid the armature, some of the objects and re-parented everything. This time it worked and I can move on now. Thanks for your patience and help. Unfortunately I was unable to find out what caused the issue in the first place.

[FedPete]

Blender hick-up … Have fun!

[Mark_Jackson]

So I suspect under the properties tab, the relationship type set to Armature instead of a specific Bone in the armature. This causes mesh objects to interpolate deformations dependent on where the bone is. I believe it may use envelope weights which uses a threshold of influence around a bone to affect mesh objects within its range.

Whereas, with these settings on each mesh where to mesh is parented to a specific bone, the mesh deforms as desired.

Hope that sheds some light on the issue. Maybe that was the problem perhaps?

[Robert_Peary]

Thanks for investigating. I went back to my old corrupted file and, as it turns out, the relationship was correctly set to the specific bone. I guess it will remain a mistery what’s causing the issue