Scaling blend shape influence

[zeruel13]

As part of a project, I've imported a character onto a certain scene, and found it necessary to scale my character by roughly 32% to match the scene proportions. The problem is, that the blend shapes do not scale their influence to match.

I'm using a group node which encapsulates all imported data to scale. Returning the node scale to 1.0 shows the blend influence working perfectly. All joint, shape, etc information is scaled, so it seems to be localised to the blend shape node or one of its relatives.

Scaling the skeletal heirarchy directly has no effect on the blend influence. Using envelope at 2 and uping each slider to 10 (max) i've acheived 20% extra, but still short of the complete influenced effect.

Any thoughts on this would be greatly appreciated.

[tfall]

You shouldn't scale the character geometry, only the root joint if the geometry is bound to the skeleton or else you'll get double transformations.

I have a blenshape on a character that I scaled by 0.555 (on the root joint and IK controls only) and the blendhsape scaled fine. I didn't scale the geometry of the character or the targets.

Some things to try:
Check if the blendshape occurs before the binding to the skeleton in the deformation order.

If all else fails, recover your targets (set the slider for each target to 1 and "add target") and then delete the blendshape. Then scale the character and the targets and create a new blendshape.

• Terry

[zeruel13]

Been a few days since the original post, and since then I think I've tried most things you've said, but unfortunately they've been very hit and miss with their results. When scaling the joint hierarchy (first thing tried) the influence problem remained the same, and was in fact how it all arose.

I also ran through each target and duplicated out to recreate the blendshape node, but even after scaling (also when not scaling) the inflluence on the original geometry was still weak.

Was a bit of a puzzler, spent about 7 determined hours on the matter..until I stopped being stupid and ate up a half-hour resizing my environment to fit instead

[badcookie]

you should be able to apply your blendshapes "front of chain" and you won't have this problem.
Here's a little method I use, before you scale anything .
Make a duplicate head in it's default expression (original size) .
Assign all of your targets to this head in parallel.
now assign the duplicate head to your character as a target "front of chain"
Now you can blend your targets seamlessly and the blendshape is first in line on your character (plus it really isolates the processes so it's easy to troubleshoot)
Deformation order is important here. If the blends happen before the scaling, then they have already been evaluated prior to your modification and therefore you have no problem.
hope this helps.