Add a walls property to soy.scenes.Room which takes a Material and renders it on 6 flat faces pointed inward toward the interior. As the walls will not render an exterior, cameras should be able to see the inside of the room even when they're outside of it looking through one or more walls.

The walls of the room must subdivide (like Box faces) such that specular lighting and other per-vertex calculations are correct:

Document this new property.

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