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Because LIC does not encode flow orientation, it cannot distinguish between streamlines of equal direction but opposite orientation.<ref name=":1" /> Oriented Line Integral Convolution (OLIC) solves this issue by using a ramp-like asymmetric kernel and a low-density noise texture.<ref name=":1" /> The kernel asymmetrically modulates the intensity along the streamline, producing a trace that encodes orientation; the low-density of the noise texture prevents smeared traces from overlapping, aiding readability.
Fast Rendering of Oriented Line Integral Convolution (FROLIC) is a variation that approximates OLIC by rendering each trace in discrete steps instead of as a continuous smear.<ref name=":1">{{Cite journal |
=== Unsteady Flow LIC (UFLIC) ===
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