THREE.JS / FOUNDATIONS 137

Where indirect light comes from.

Keep one PBR surface, then trace environment radiance, probe irradiance, and baked light-map irradiance through the lighting context. The custom models make the native physical split visible instead of treating IBL as one opaque texture.

Initializing -

Preparing a generated PMREM, diffuse LightProbe, and light-map context.

Material: -
Lighting model: -
Indirect context: -
Source contract: -
Lights list: -
Graph builds: -
Draw calls: -
Triangles: -
CPU avg: -
CPU p95: -
Texture memory: -
Context cache: -

Context contractready

Lighting model contract Indirect source contract Direct gain 0.90 Indirect gain 1.00 Specular gain 1.00 Ambient occlusion 0.86

Animate light rig

Gain and AO controls update uniforms; model and source ownership changes wait for an explicit rebuild.

Lighting contextphysical IBL

EnvironmentNode+LightProbeNode+IrradianceNode->LightingContextNode->PhysicalLightingModel

Native PBR reads irradiance for diffuse response and radiance/IBL irradiance for roughness-aware specular response.

Derived resourceswaiting

The source panorama, cube capture, PMREM, LightProbe, and lightmap have not been created yet.

Source panorama-

Cube capture-

PMREM radiance-

Diffuse probe-

Baked lightmap-

Official context split: EnvironmentNode adds radiance and iblIrradiance; probes and light maps add irradiance. The custom IBL model is intentionally a context study, not a replacement for the full physical BRDF. Use ?forceWebGL=1 for WebGL2.

Review NodeMaterial environment ownership ->

LAB 137 / CUSTOM IBL CONTEXTS