Which statement accurately describes a key difference between native instancing and point instancing?

Native instancing composes each instance as a unique, addressable prim in the scene graph. This allows individual instances to be selected, inspected, and have their properties overridden independently. In contrast, point instancing uses a single UsdGeomPointInstancer prim to represent a vast collection of instances. The individual instances are not represented as prims in the scene graph; they are implicitly generated from attribute arrays (like positions, orientations, etc.) on the instancer prim. This makes point instancing highly efficient for rendering massive populations like forests or crowds, but at the cost of individual addressability.

A. Prototypes for both instancing methods are statically defined prims that are referenced; neither generates them dynamically during composition.

B. Both native and point instancing can use multiple prototypes. Point instancers use the protoIndices attribute to specify different prototypes per instance.

C. Prototypes for both methods can be defined in the same layer or referenced from external files; there is no such restriction.

1. Pixar. (2023). OpenUSD Documentation: Instancing. "Native instances are 'real' prims in the scenegraph... This means that native instances are individually selectable and queryable... For Point Instancers... The individual instances are not, themselves, prims that can be individually addressed, selected, or overridden." Retrieved from https://openusd.org/release/tutinstancing.html

2. NVIDIA Corporation. (2023). USD Glossary: Instancing. "Native Instancing: Instances are unique, addressable prims on the Stage... Point Instancing: A single prim that represents a collection of instances." (Section: Instancing).