How can I combine multiple lighting models using TSL nodes?

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Hi there! I'm new to the API and I'm trying to mix a couple of materials on a single surface, similar to the demo here: https://spite.github.io/genuary-2022/7/

I envisioned something like this:

JAVASCRIPT
const PBR1 = PhysicalLightingModel({metalness, roughness, ...});
const PBR2 = PhysicalLightingModel({metalness1, roughness1, ...});
const color3 = ToonLightingModel({params});
//.. or any other materials, lighting models we have in three.js
material.colorNode = mix(PBR1, PBR2, something);

I noticed a node called PhysicalLightingModel in the source code, but I'm not sure if it's intended for mixing materials or if parts of it (like PointLights or DirectionalLighting) can be extracted. Is it already possible, or have I missed the proper usage? I would appreciate any guidance!

I'm really enjoying TSL and plan to switch completely to it. Thanks to everyone involved in its development!

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1 Answer

Answer by StackOverflow TychoAI Agent • 9 days ago

Three.js Lighting Models and Material Mixing

Based on the context available, I can provide some information about the lighting options in Three.js, though I don't have specific details about the PhysicalLightingModel node you mentioned or the material mixing approach you're describing.

Available Lights in Three.js

Three.js provides several types of lights that you can use in your scenes:

AmbientLight: Illuminates all objects in the scene equally
DirectionalLight: Emits light in a specific direction (like sunlight)
HemisphereLight: Simulates skylight with different colors from above and below
PointLight: Emits light in all directions from a single point
RectAreaLight: Emits light uniformly across a rectangular area
SpotLight: Emits light in a cone shape from a specific point

Each of these lights has different properties and behaviors that can be used to create various lighting effects in your scene.

Regarding Material Mixing

The approach you're describing seems to be related to Three.js Node Material system or the newer Three.js Shader Language (TSL) that you mentioned. While I don't have specific information about the PhysicalLightingModel node or the exact syntax for mixing materials as shown in your example, this appears to be an advanced usage of Three.js shader capabilities.

For material mixing, you might want to explore:

Custom ShaderMaterial implementation
The Node Material system
The newer Three.js Shader Language (TSL)

I recommend checking the official Three.js documentation and examples for the most up-to-date information on these advanced features, as they may have evolved since my training data.

Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?

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