Line integral convolution: Difference between revisions

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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 |last1=Wegenkittl |first1=Rainer |last2=Gröller |first2=Eduard |date=24 October 1997 |title=Fast Oriented Line Integral Convolution for Vector Field Visualization via the Internet |url=https://www.cg.tuwien.ac.at/research/vis/dynsys/frolic/frolic_crc.pdf |journal=IEEE |pages=309–316 |doi=10.1109/VISUAL.1997.663897|isbn=0-8186-8262-0 }}</ref><ref>[https://www.cg.tuwien.ac.at/research/vis/dynsys/frolic/ Java Exploration Tool for Dynamical Systems by R. Wegenkittl and E. Gröller.]</ref>
 
=== Unsteady Flow LIC (UFLIC) ===