I've got a character made up of several parts and Im trying to create a blendshape of the entire character squished with an lattice modifier - is it possible to somehow create a blendshape of the WHOLE model rather than each individual part or pieces like accessories
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if it's an unskinned character then it's quite simple - create a copy of all the pieces, attach them together into a single proxy mesh, make the lattice work as desired on this, then deactivate the modifier.
now use a skinwrap modifier on each part of your original character and target it to the proxy. activate the lattice on that again and that should do it. since vertex positions on both meshes will be identical, you can set skinwrap to face deformation and dial down the falloff all the way. to create blendshapes you'll have to 'snapshot' the skinwrapped meshes.
same principle will work elsewhere but you'll have to find the names of the corresponding tools yourself.