Chapter 131: PhysicalLightingModel

Core Idea

Represents the lighting model for a PBR material.

Key Concepts

• anisotropy : boolean: Whether anisotropy is supported or not.
• clearcoat : boolean: Whether clearcoat is supported or not.
• clearcoatRadiance : Node: The clear coat radiance.
• clearcoatSpecularDirect : Node: The clear coat specular direct.
• clearcoatSpecularIndirect : Node: The clear coat specular indirect.
• dispersion : boolean: Whether dispersion is supported or not.
• iridescence : boolean: Whether iridescence is supported or not.
• iridescenceF0 : Node: The iridescence F0.
• iridescenceF0Dielectric : Node: The iridescence F0 dielectric.
• iridescenceF0Metallic : Node: The iridescence F0 metallic.

Reference Tables

Constructor

Signature
new PhysicalLightingModel( clearcoat : boolean, sheen : boolean, iridescence : boolean, anisotropy : boolean, transmission : boolean, dispersion : boolean )

Properties

Property	Description
.anisotropy : boolean	Whether anisotropy is supported or not.
.clearcoat : boolean	Whether clearcoat is supported or not.
.clearcoatRadiance : Node	The clear coat radiance.
.clearcoatSpecularDirect : Node	The clear coat specular direct.
.clearcoatSpecularIndirect : Node	The clear coat specular indirect.
.dispersion : boolean	Whether dispersion is supported or not.
.iridescence : boolean	Whether iridescence is supported or not.
.iridescenceF0 : Node	The iridescence F0.
.iridescenceF0Dielectric : Node	The iridescence F0 dielectric.
.iridescenceF0Metallic : Node	The iridescence F0 metallic.
.iridescenceFresnel : Node	The iridescence Fresnel.
.sheen : boolean	Whether sheen is supported or not.
.sheenSpecularDirect : Node	The sheen specular direct.
.sheenSpecularIndirect : Node	The sheen specular indirect.
.transmission : boolean	Whether transmission is supported or not.

Methods

Method	Description
.ambientOcclusion( builder : NodeBuilder )	Implements the ambient occlusion term.
.direct( lightData : Object, builder : NodeBuilder )	Implements the direct light.
.directRectArea( input : Object, builder : NodeBuilder )	This method is intended for implementing the direct light term for rect area light nodes.
.finish( builder : NodeBuilder )	Used for final lighting accumulations depending on the requested features.
.indirect( builder : NodeBuilder )	Implements the indirect lighting.
.indirectDiffuse( builder : NodeBuilder )	Implements the indirect diffuse term.
.indirectSpecular( builder : NodeBuilder )	Implements the indirect specular term.
.start( builder : NodeBuilder )	Depending on what features are requested, the method prepares certain node variables which are later used for lighting computations.

Key Takeaways

1. PhysicalLightingModel extends: LightingModel
2. Most relevant properties: anisotropy, clearcoat, clearcoatRadiance, clearcoatSpecularDirect.
3. Key methods: ambientOcclusion, direct, directRectArea, finish.

Connects To

• LightingModel: parent class
• Source: src/nodes/functions/PhysicalLightingModel.js