Chapter 142: RectAreaLightNode

Core Idea

Module for representing rect area lights as nodes.

Key Concepts

• halfHeight : UniformNode.<vec3>: Uniform node representing the half height of the are light.
• halfWidth : UniformNode.<vec3>: Uniform node representing the half width of the are light.
• updateType : string: The updateType is set to NodeUpdateType.RENDER since the light relies on viewMatrix which might vary per render call.

Reference Tables

Constructor

Signature
new RectAreaLightNode( light : RectAreaLight )

Properties

Property	Description
.halfHeight : UniformNode.<vec3>	Uniform node representing the half height of the are light.
.halfWidth : UniformNode.<vec3>	Uniform node representing the half width of the are light.
.updateType : string	The updateType is set to NodeUpdateType.RENDER since the light relies on viewMatrix which might vary per render call.

Methods

Method	Description
.update( frame : NodeFrame )	Overwritten to updated rect area light specific uniforms.

Key Takeaways

1. RectAreaLightNode extends: EventDispatcher → Node → LightingNode → AnalyticLightNode
2. Most relevant properties: halfHeight, halfWidth, updateType.
3. Key methods: update.

Connects To

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