Stop Blend Shapes Affecting Weight Maps

[petunia]

Hi,

I have an object with a skeleton and weight maps painted.

I am trying to produce some blend shapes for the face but they are affecting the weight maps.

Example: The brow furrows and the jaw moves.

How do I stop this?

THANKS!

[drblacksnake]

does on burrow jaw bone moves or only skin deforms?

[petunia]

None of the bones are moving.
I've checked the jawbone and it does not move.

The skin in the jaw moves even though the blend shape has no deformation in that area.

In the blend shape I am only moving the brow area, yet the jaw moves also.

[drblacksnake]

actually it should not, unless You have yet another deformer involved.. eg wrap. check input list carefully. if unsuccessful, then post a zipped MA - i'll be about 2hrs online since now.

[petunia]

The blend shape is on a wrap deformer.

I have tried every position in the input hierarchy and it still breaks.

I have also detached the skin form the skeleton and it still does not work as you'd expect.

If you have an opportunity to examine the scene please email off list and I will send it to you.

Many thanks!
a_lb2@hotmail.com

[drblacksnake]

You have messed up original shape of head in some odd way. try yourself copy current head and add it as a new blend target - even no vertex should move, they do in some places more than just a jaw.
only thing I can suggest is to do a copy of current head, delete from it Orig shape and redo skinning (or just bind this new paralel to current and copy skin weights) , blendshapes and sculpts. Hide current head, make sure new one works, delete old one.
report back if problematic.

[petunia]

I think there's a bug.

This workflow creates an error:
1. Duplicate the head.
2. Model the blend shape.
3. Create the blend shape.

This workflow works ok:
1. Duplicate the head.
2. Create the blend shape.
3. Model the blend shape.

You should be able to Model the blendshape first but if I do it always creates unwanted deformations.

[joojaa]

no it is actualy the wrap that gets confiused here. In general i would avoid using wraps at all cost especialy if not needed.

Se theres nothing to gain form having a wrap and only a blended head thats part of the whole shape. Its just stupid workflow, one can allways bake the changes to the originakl geo and end up with a lighter modell anyway.

[drblacksnake]

I haven't seen any traces of wrap (except display layer was named so) so I can't judge. Anyway, i guess 1st workflow is more logic, but You should always check for Orig shape to be same as base shape. This could be done with no care if You simply delete it just before creating blendShapes - Orig shape gets re-created.
As far as You get there another deformers, figure out how to manage workflow wisely.