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Reference.org
Cone tracing
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<p>Cone tracing and <a href="/facts/Beam_tracing/Cc4zjIQ5">beam tracing</a> are a derivative of the <a href="/facts/Ray_tracing_(graphics)/n6qpap2q">ray tracing</a> <a href="/facts/Algorithm/fnl5NmRt">algorithm</a> that replaces rays, which have no thickness, with thick rays. </p>