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Abstract:
Typically, flow volumes are visualized by defining their boundary as
iso-surface of a level set function. Grid-based level sets offer a good global
representation but suffer from numerical diffusion of surface detail, whereas
particle-based methods preserve details more accurately but introduce the
problem of unequal global representation. The particle level set (PLS) method
combines the advantages of both approaches by interchanging the information
between the grid and the particles. Our work demonstrates that the PLS
technique can be adapted to volumetric dye advection via streak volumes, and to
the visualization by time surfaces and path volumes. We achieve this with a
modified and extended PLS, including a model for dye injection. A new
algorithmic interpretation of PLS is introduced to exploit the efficiency of
the GPU, leading to interactive visualization. Finally, we demonstrate the high
quality and usefulness of PLS flow visualization by providing quantitative
results on volume preservation and by discussing typical applications of 3D
flow visualization.
