Philip Rideout 70dba2398e gltfio: add createInstance() to AssetLoader. ...

Note that this API is on the loader rather than the asset. This is
because the loader knows how to create Filament entities by traversing
a cgltf node hierarchy.

Animation on dynamically added instances is not yet supported.

We did not add destroyInstance() because gltfio favors flat arrays for
long term storage of entity lists and instance lists, which would be
slow to shift. We also wish to discourage create/destroy churn since it
is more efficient to pre-allocate instances and selectively add them
into the scene.

Fixes #3137.

2020-11-02 09:47:14 -08:00

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