Flow fields are often represented by a set of static arrows to illustratescientific vulgarization, documentary film, meteorology, etc. This simpleschematic representation lets an observer intuitively interpret the mainproperties of a flow: its orientation and velocity magnitude. We propose togenerate dynamic versions of such representations for 2D unsteady flow fields.Our algorithm smoothly animates arrows along the flow while controlling theirdensity in the domain over time. Several strategies have been combined to lowerthe unavoidable popping artifacts arising when arrows appear and disappear andto achieve visually pleasing animations. Disturbing arrow rotations in lowvelocity regions are also handled by continuously morphing arrow glyphs tosemi-transparent discs. To substantiate our method, we provide results forsynthetic and real velocity field datasets.
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