A path tracer bakes indirect illumination into one shared lightmap atlas for every ShadedGeometry in the scene, incrementally, without hitching the frame. The only light is a single realtime sun and the environment is black, so everything you see in shadow — the walls' inner faces, the red bleed onto the white box — is baked sun bounce, filling in as the bake progresses. Drag the indirect intensity slider to compare before/after.
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