The following interfaces are pre-defined and work without any further parameter input:

Perfect absorber:

Any ray that hits a surface covered with a perfect absorber is absorbed, independent of angle of incidence, polarization or frequency.

The following example shows a sphere coated with a perfect absorber. It is illuminated by a parallel beam:

Perfect mirror:

Any ray hitting a surface covered with a perfect mirror is reflected with a probability of 1, independent of angle of incidence, polarization or frequency.

A sphere coated with a perfect mirror behaves like this: