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Nonimaging optics is a field that studies optimal concentration of light
from a source distribution to a receiver. The relevant information is codified by a
field of cones at each point of the concentrator, formed by those rays that we want
to reach the receiver (perhaps after some reflections on the wall of the concentrator).
This suggests that we can use Lorentz geometry to analyze the problem. We will
establish a technique to design three dimensional ideal concentrators with arbitrary
media which generalizes a previous one for the homogeneous case.