Contains Scene, Node, and other related data structures.
| Node | A node in the node hierarchy. When the node contains skin, all
mesh.primitives must contain JOINTS_0 and WEIGHTS_0 attributes.
A node can have either a matrix or any combination of
translation/rotation/scale (TRS) properties. TRS properties are converted
to matrices and postmultiplied in the T * R * S order to compose the
transformation matrix; first the scale is applied to the vertices, then the
rotation, and then the translation. If none are provided, the transform is the
identity. When a node is targeted for animation (referenced by an
animation.channel.target), only TRS properties may be present; matrix will not
be present.
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| Scene | The root Nodes of a scene.
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