We present a fast and flexible technique for creating hair styles directly from modeled geometry by advecting streamlines in sparse high-resolution velocity fields derived from the surfaces or curves. Typically artists model hair styles as polygonal surfaces or curves representing sparse guide hairs. From this we automatically create a sparse, volumetric vector field with direction and magnitude derived from the tangents of the input geometry or curves. Additional hair styling is achieved by modifying this vector field, and curves representing the final hair model are computed as streamlines. This volumetric approach represents a significant paradigm shift from traditional curve-based hair modeling in that it allows artists to intuitively create and modify realistic hair styles directly from geometric surface models. Our technique also lends itself well to up-sampling of spares guide hairs without the need to
employ explicit curve-based interpolation schemes.
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