THREE.JS / FOUNDATIONS 126

Filter the light.

A raw dynamic cube is a capture. A PMREM is a roughness-aware lighting representation. Compare the source, the prefilter path, and the material response without hiding the generated target.

Initializing -

Creating a raw cube capture and PMREM comparison.

backend: -
raw target: -
pmrem target: -
active map: -
mapping: -

Environment pipelinecapture → filter → shade

renderer target active environment scene blur sigma

animate capture scene

Raw capturewaiting

size: -
faces: 6
mipmaps: -
filter: -

CubeCamera writes the raw source before any PMREM processing.

PMREM outputnot generated

class: -
size: -
mapping: -
textures: -

PMREM stores filtered radiance in a CubeUV layout with extra roughness levels.

mirrorroughness 0.05

Sharp highlights expose capture direction and source detail.

material: -
map: -

satinroughness 0.25

Moderate roughness is where PMREM filtering becomes visible.

material: -
map: -

matteroughness 0.55

Broad lobes need prefiltered radiance rather than a single sharp sample.

material: -
map: -

diffuseroughness 0.90

High roughness approximates the broadest PMREM levels.

material: -
map: -

Generation and render timingwaiting

capture faces: -
PMREM ms: -
CPU frames: -
CPU avg: -
CPU p95: -
memory textures: -

PMREM generation is a target-producing operation; dispose old output before rebuilding to avoid retaining GPU resources.

CubeCamera → raw CubeTexture → raw sampling OR PMREMGenerator → CubeUV roughness levels → PBR materials

Raw cube mipmaps are ordinary texture levels. PMREM adds GGX-aware filtered levels for physically based image-based lighting; switching the pipeline changes the sampled representation, not the captured scene.

Compare texture color and sampler policy next →

LAB 126 / ENVIRONMENT FILTERING + PMREM