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Display Layers are used within maya
to logically group a collection of objects. An animators main
use of layers, is usually to group sets of animation controls
together. There is however a lot of scope to use layers to say
group the transforms which you will export animation for; or to
split the character into upper and lower body bone sets etc. Ultimately
each layer node will be connected to the items that are a part
of that layer. To find this set of objects we merely need to query
all outgoing connections.
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