Creating the denormalized_skin context manager
In this and proceeding sections, we'll build a context manager that will temporarily denormalize a skin cluster.
Most skin clusters are normalized and support a limited number of influences. A skin is normalized when the sum of all influence weights equals 1.0 for each vertex. This ensures the skin deforms in a predictable way. Limiting the number of vertex influences is generally useful when doing things like painting skin weights. It can also be a technical constraint (for example in the case of many video games), or a useful way to simplify the skinning process (you don't need to worry about culling low influences repeatedly).
Even though normalized skin and limited influences are useful for interactive ...
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