The sIBL method is especially nice: using 3 image maps, one as a background, one
as reflection, and one as a lighting environment. Have you had any method of
using an image map as just a light source and another as just a source of
reflection? I would imagine two surrounding spheres, an outer sphere that acts
just as a light map for illumination, and a slightly inner sphere that lets
light pass through but visible only on reflective surfaces.

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