P

parallel point
A light source that illuminates objects with parallel light. The light's orientation is taken from the position of the parallel-point light source. For example, two meshes on both sides of a parallel point light source are lit on the side that faces the position of the source.
penumbra
The outer, dimly lit section of a spotlight's cone of light. The penumbra surrounds the umbra and merges with the surrounding deep shadow. See also umbra and spotlight.
point
A light source that radiates equally in all directions from its origin.
power
In the specular property of a material, the value that determines the sharpness of specular highlights. A value of five gives a metallic appearance, and higher values give a more plastic appearance.

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