## P

parallel point
  A light source that illuminates objects with parallel light, but the orientation of the light is taken from the position of the parallel point light source. For example, two meshes on either side 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 5 gives a metallic appearance, and higher values give a more plastic appearance.

© 1997 Microsoft Corporation. All rights reserved. Terms of Use.