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Combining the two is, from a user perspective, as simple as just enabling both animations at the same time. When it comes to using this feature efficiently though, there are a few points to bear in mind:
When combining animation types, your vertex programs must support both types of animation that the combined mesh needs, otherwise hardware skinning will be disabled. You should implement the animation in the same way that OGRE does, ie perform vertex animation first, then apply skeletal animation to the result of that. Remember that the implementation of morph animation passes 2 absolute snapshot buffers of the from & to keyframes, along with a single parametric, which you have to linearly interpolate, whilst pose animation passes the base vertex data plus 'n' pose offset buffers, and 'n' parametric weight values.
If you only need to combine vertex and skeletal animation for a small part of your mesh, e.g. the face, you could split your mesh into 2 parts, one which needs the combination and one which does not, to reduce the calculation overhead. Note that it will also reduce vertex buffer usage since vertex keyframe / pose buffers will also be smaller. Note that if you use hardware skinning you should then implement 2 separate vertex programs, one which does only skeletal animation, and the other which does skeletal and vertex animation.
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