A stream surface may be one of two types: In scientific visualization a stream surface is the 3D generalization of a streamline.
It is the union of all streamlines seeded densely on a curve.
Like a streamline, a stream surface is used to visualize flows – three-dimensional flows in this case.
Specifically, it is "the locus of an infinite set of such curves [streamlines], rooted at every point along a continuous originating line segment.
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