Light sources emit rays. Some of the SPRAY light sources are transparent, some are absorbing.

Every light souce must be embedded in a material which is to be taken from the list of dielectric functions. If the light source is embedded in a light scattering material you have to set the corresponding scattering object.

At present there must be exactly one light source in a SPRAY setup.

The following types of light sources are available:

•Point light source

•Rectangular light source

•Circular light source

•Volume light source