Adds the specified light to the scene.
Represents a sample taken from a light source that faces a point being
shaded.
Creates a new light sample object (invalid by default).
This interface is used to represent any light emitting primitive.
Retrieve a geometry object by its name, or null
if no
geometry was found, or if the specified object is not a geometry.
Retrieve a modifier object by its name, or null
if no
modifier was found, or if the specified object is not a modifier.
Retrieve a shader object by its name, or null
if no shader
was found, or if the specified object is not a shader.