Chapter 117: IESSpotLightNode

Core Idea

An IES version of the default spot light node.

Key Concepts

• _iesTextureNode : TextureNode: The texture node representing the IES texture.

Reference Tables

Constructor

Signature
new IESSpotLightNode( light : SpotLight )

Properties

Property	Description
._iesTextureNode : TextureNode	The texture node representing the IES texture.

Methods

Method	Description
.getSpotAttenuation( builder : NodeBuilder, angleCosine : Node.<float> ) : Node.<float>	Overwrites the default implementation to compute an IES conform spot attenuation.
.update( frame : NodeFrame )	Overwritten to update the IES spot light texture.

Key Takeaways

1. IESSpotLightNode extends: EventDispatcher → Node → LightingNode → AnalyticLightNode → SpotLightNode
2. Most relevant properties: _iesTextureNode.
3. Key methods: getSpotAttenuation, update.

Connects To

• EventDispatcher: parent class
• Node: parent class
• LightingNode: parent class
• AnalyticLightNode: parent class
• SpotLightNode: parent class
• Source: src/nodes/lighting/IESSpotLightNode.js