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Old 19-05-2003, 08:47 PM   #1
cb8rwh
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Default Blendshapes & skinning order

ello,

I want to use blendshapes to create some facial animation, but also use bones to open close the mouth. Can I skin the head then create blendshapes or do I have to create all the blendshapes first then bind the mesh?
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Old 19-05-2003, 10:11 PM   #2
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why would you want to open and close the mouth with a skeletton? it is easier to just use your blendshapes for it - as there is more than one way to open your mouth.

just a suggestion
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Old 20-05-2003, 02:30 AM   #3
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probably safest to do blend shapes first.
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Old 21-05-2003, 06:37 PM   #4
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To answer your question: I think you want to have the blendshapenode below the skinnode in the "stack". In praxis I've created the blendshapenode aften applying skin and then moved it below the skinnode, but that can cause trouble and in some cases you just can't do it, so avoid it if you can! I surgest that you copy the headmesh, name it eg. Blendshape_Head_base and apply a blendshapenode with that as the only target. You then apply the skinning and when you are ready you just duplicate the base head, create the desired shapes and add those targets to the allready exsisting blendshapenode.

Joints for jaw: One nice thing about opening the mouth with a joint is that it is based on rotations. Blendshapes goes from point a to b in a straight line, unless you ad inbetween targets I guess. Also you can parent stuff like teeth to the joint. If you add an extra joint inbetween the head and jaw joint, and place it say around the forehead, you can use those rotations to bring the jaw in and out. With those bones you get: open/close, in/out, twist and "grind". If you want more flexibility simply add shapes also or maybe even tweak the skin deformations by driving shapes with joint rotations. If you look up the project "Cane Toad" they have a page describing how they rigged all the facial deformations of a character with bones instead of blends.. But that not for mortals to set-up!!

Whew.. many words.

Cheers

Last edited by Nenox : 21-05-2003 at 06:39 PM.
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