Chapter 422: IndexNode

Core Idea

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 a compute invocation's subgroup within its workgroup.

Key Concepts

• isIndexNode : boolean (readonly): This flag can be used for type testing.
• scope : string: The scope of the index node.

Reference Tables

Constructor

Signature
`new IndexNode( scope : 'vertex'

Properties

Property	Description
.isIndexNode : boolean (readonly)	This flag can be used for type testing.
.scope : string	The scope of the index node.

Key Takeaways

1. IndexNode extends: EventDispatcher → Node
2. Most relevant properties: isIndexNode, scope.

Connects To

• EventDispatcher: parent class
• Node: parent class
• Source: src/nodes/core/IndexNode.js