THREE.JS / FOUNDATIONS 268

Light has a measurable budget.

Translate a household bulb into lumens, an ambient sky into lux, and distance into the falloff the renderer actually computes.

Initializing physical lights—

Preparing the real-world lighting scale.

Physical lighting controlsWAITING

bulb luminous power ambient irradiance

tone response 0.68 bulb height 1.25 m

shadow maps move bulb auto-rotate camera

Physical light contract PBR

light sourcePointLight.power

falloffdecay = 2

ambient unitlux / irradiance

tone mappingReinhard

shadow policyenabled

fallbackdirect physical

The bulb is 5 cm in diameter; the brick stage is authored in metre-like units.

The renderer will report which physical-light path is active after initialization.

Derived from the official Physical Lighting Model example, PointLight, HemisphereLight, and WebGPURenderer contracts. This bounded study does not claim whole-example fidelity.