THREE.JS / ENVIRONMENT + MATERIALS

Energy stays in the room.

A white furnace makes conservation visible: roughness runs left to right, metalness runs top to bottom, and every sphere shares the same filtered radiance.

Initializing furnace test—
Preparing the white environment and physical material grid.

The native lane uses a PMREM-backed MeshPhysicalNodeMaterial grid; ?backend=webgl exposes the explicit MeshPhysicalMaterial reference.

LAB / WHITE FURNACE