I have a sea turtle mesh and skins I have created in ZBrush and Blender, and I spent some time in Blender trying to make as nice a mesh as I know how... or at least as I think I know how.

For the head, neck and much of the rest of the critter I get good movement and deformation of the meshes and skins, except in the armpit... when the flippers meet the body. See the images I have attached.

sea turtle

Although that showing the tearing at maximum bone movement, it shows up with almost any movement.

Am I asking individual bones to do too much? Add more bones and reweight? Or should I have built more crenellation into the skin, so there are true folds that can move? And/or have a I missed something even more obvious? The tearing and stretching of the mesh is more than I have seen in other rigs we've done, and leads me to think I am missing something really fundamental about geometry and weightpainting...


  • $\begingroup$ can you post a pic of that same view in weight-paint mode, one each for the bones on either side of the point in question? $\endgroup$ – Mike Metcalf Sep 15 '15 at 1:09
  • $\begingroup$ Just posted a fixed view.... $\endgroup$ – rcgauer Sep 15 '15 at 18:35
  • $\begingroup$ my working hypothesis was that there was too abrupt of a transition between the influence of one bone to the next, but I'm not sure, and further, I can't tell from what you've posted. The mesh looks sufficiently tessellated that such a distortion shouldn't be happening, but that would entirely depend upon the weight painting. In general, I would say that the influences of each of the 3 or 4 small bones in the shoulder area should not have abrupt weight-painted transitions, and that when animating a fin movement, you would be careful to only rotate any one bone by a small amount. $\endgroup$ – Mike Metcalf Sep 16 '15 at 20:02

Actually... I threw away everything and recreated, using face masking to assure good delineation of weights.... but that leaves two variables to explain it: better bone alignment to the intended motion of the critter, and more precise weight painting. Face masking rocks. This is the final one... I did not get a weight view of the faulty one.

enter image description here


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.