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If a UV is set on a primitive, then a material and the following attributes are set on that primitive as well.
Otherwise, no material or attributes are set on that primitive.

Property Values
Vertex Normal
Vertex Tangent
Vertex Color
Normal Texture
Base Color Texture

Both primitives are using the same index values, but have different vertex positions.
If indices are not used, then the model are assigned unique vertex positions per the primitive mode.

Indices for Primitive 0 (Left) Indices for Primitive 1 (Right)

The texture applied to a primitive uses Vertex UV 1 if possible. otherwise, Vertex UV 0 is used.

Primitive 0 Vertex UV 0 Mapping Primitive 1 Vertex UV 0 Mapping Primitive 0 Vertex UV 1 Mapping Primitive 1 Vertex UV 1 Mapping

The following table shows the properties that are set for a given model.

Sample Image Primitive 0 Vertex UV 0 Primitive 1 Vertex UV 0 Primitive 0 Vertex UV 1 Primitive 1 Vertex UV 1
00
View
01
View
02
View
03
View
04
View
05
View
06
View
07
View
08
View