Projected texture – point light
All light sources covered up to this point spread light in an even intensity distribution. However, sometimes a light source has a more sophisticated intensity distribution pattern. For example, a lamp shade can change the light intensity distribution and make it uneven. A different situation is when the intensity is even, but the color isn't due to something covering the light source. Using math to represent those and other situations may be too complex or have a negative effect on rendering performance. The most common solution in these cases is to use a texture that represents the intensity/color pattern emitted by these light sources.
The following screenshot shows a point light source projecting a texture with ...
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