Maya Mirror Skin Weight Problem

Krisonrik

I've been trying to paint the skin waight on one side then mirror it on a symmetrical model.
But after I mirror it, one of the collar bone gets the skin weight of both sides and the other side is completely blank. I'm not sure whether I'm the only one who's had this problem before. It's very weird. The model is at origin. x 0 y 0 z 0. I mirrored it through yz so it is supposed to copy +x to the -x. Thanks in adavance. And here is a screen shot of the problem.

ericdigital

The mirror tool blows, its always been finnicky. I have a few friends that rig in maya and they either use, or wrote there own custom scripts to mirror weights. Not really sure if that tool had ever worked to be honest!

Whargoul

Are the bones in the exact same world space? Maya gets confused if multiple bones shares the same world space transform since it picks the bones based on mirrored location.

Krisonrik

Well the collar bone should have a very similar world space but with a -x I think. I just used mirror bone to create the whole right arm bones. Is there a way around this? I am very noobish when it comes to rigging. Please give me some advices. Thanks in advance.

ivars

This usually works fine for me. What version are you on?
Make sure your character is in bind pose before mirroring.

Whargoul

It will be fine then - the problem is only if two bones share exact x,y & z values. You have the second influence set as label - I wonder if that's an issue? What if you set it to none? Or try some of the other options in there too.

elte

I saw there's some weight in the chest, right on the center. At some cases the mirror won't happen because its shared by same influence.

Imagine when mirroring, the value is 0.123, so when its mirrored, it becomes -0.123

By having some weight on the center, which is 0, will still be 0 after mirrored. Hope you get what I mean.

Select the verts of half the model u want to mirror, except those in the center/symmetry point, and perform default mirror, hope it works.

Krisonrik

Ok, mystery solved. I can't believe I'm this noob. Well apparently I created the collar bones with at x 0 position... so it's sharing same position as one of the spinal cord bones. Thanks for all the help. I was a dumbass.

Whargoul

Told ya

Gail_Blitzy

I'm having a mirror weight problem aswell!!!

The Joints are in different world spaces and I've got the weights pretty good on one side and when i apply the mirror painted weights tool it just TOTALLY messes up what I've done.

Any ideas what's happened???