Things could be different, but theyre not. The shadow blister effect is a visual effect whereby adjacent shadows appear to bulge (or blister) towards one another when cast by one or more non-point light sources. It is the result of overlapping shadow penumbra on the surface and the perception by the brain of a contrast barrier formed by the merging of the penumbra. The visual effect is proportionate to the distance of the obstructions to the shadow surface (as the penumbras become larger), as well as the angular diameter of the light source(s). Penumbras can be easily demonstrated using Ray Theory. https://youtube/watch?v=f3RAI8Ntamw
Posted on: Mon, 05 Jan 2015 15:01:34 +0000
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