THREE.JS / FOUNDATIONS 138

Three paths to IBL.

Hold the lighting context steady while swapping its source: a real HDR/EXR file, a PMREM captured from a scene, or a live CubeCamera capture. The bench makes source fidelity, probe generation, and derived-resource ownership measurable.

Initializing -

Preparing real-file and scene-capture IBL pipelines.

source: -
pipeline: -
lighting model: -
probe: -
graph builds: -
draws: -
triangles: -
capture ms: -
PMREM ms: -
CPU avg: -
CPU p95: -
textures: -

Source and context contractready

Source pipeline Lighting model Capture position Capture size Scene PMREM blur Direct gain 0.90 Indirect gain 1.00 Specular gain 1.00 Ambient occlusion 0.86

Animate study surfaces

Model and capture ownership changes wait for an explicit rebuild; gain and AO update uniforms.

Representation graphwaiting

source->capture->PMREM + LightProbe->LightingContextNode

The selected pipeline has not been built.

Resource ownershipwaiting

Decoded files, cube captures, PMREM radiance, and probe irradiance are tracked independently.

Raw equirectangular-

Capture scene-

Cube target-

PMREM radiance-

Diffuse LightProbe-

Conversion timingwaiting

load ms: -
capture ms: -
probe ms: -
PMREM ms: -
frames: -
source status: waiting

Load a source, choose a context, and sample post-conversion shading.

The real-file path uses HDRLoader/EXRLoader plus PMREMGenerator.fromEquirectangular(). Scene and cube paths contrast fromScene() with CubeCamera.update() and fromCubemap(); all probe paths use LightProbeGenerator.fromCubeRenderTarget(). Use ?forceWebGL=1 for the forced WebGL2 route.

Review raw cube and PMREM filtering ->

LAB 138 / IBL SOURCE FIDELITY