FilterLightSource Class
The light of a DiffuseLightingPrimitive or of a SpecularLightingPrimitive: DistantLight, PointLight or SpotLight.
public abstract class FilterLightSourceRemarks
The positions of a light are in the coordinates of the drawing, and its z is a length of the drawing, above the plane: on the canvas, it is multiplied by the square root of the product of the scales of the axes. Lights are immutable and thread-safe.