static get type() {

		return 'IndexNode';

	}
This class represents shader indices of different types. The following predefined node
objects cover frequent use cases:

- `vertexIndex`: The index of a vertex within a mesh.
- `instanceIndex`: The index of either a mesh instance or an invocation of a compute shader.
- `drawIndex`: The index of a draw call.
- `invocationLocalIndex`: The index of a compute invocation within the scope of a workgroup load.
- `invocationSubgroupIndex`: The index of a compute invocation within the scope of a subgroup.
- `subgroupIndex`: The index of the subgroup the current compute invocation belongs to.

@augments Node