GLTFModel

Make a model from its parts, as the loader does

The animations, play one through createObject's GLTFObject

Every part combined, each tinted with its material color; the texture is textureInfo, and blending and unlit stay with the parts, which createObject draws

One per primitive of every node that has a mesh

The texture to draw mesh with, when every part uses the same one

Move every part so the center of the model's bounds is on the origin, like Mesh.center

Make an object at a position with a child per part, so each keeps its own texture, color and blending, and the model's animations can play on it; the way to show a model with windows or other see through parts, which the combined mesh draws solid, or one that moves

Free the GPU buffers of every part's mesh and of the combined mesh, and the textures, for a model that is done with, like a level's models when the next level loads

• Destroy the objects createObject made from it first; a mesh drawn again only uploads again, but a freed texture is gone

Scale every part evenly so the model's largest extent is a size, like Mesh.fit, for models of unknown units

Find an animation by name or number

The box around every part, measured once and again after transform, so change the model through that

How far each part has moved from its resting place at a time in an animation, one matrix per part

• createObject's GLTFObject calls this as it plays, a game only needs it to pose something by hand

Move, turn or scale every part and the combined mesh together