Builds a filtered and sorted set of appearance layers, each representing a drawable layer of a character's current appearance. Layers
that will not be drawn (because their asset is not visible or they do not permit the current asset type) are filtered out at this stage.
Builds a filtered and sorted set of appearance layers, each representing a drawable layer of a character's current appearance. Layers that will not be drawn (because their asset is not visible or they do not permit the current asset type) are filtered out at this stage.