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PRODID:-//Microsoft Corporation//Outlook MIMEDIR//EN
VERSION:2.0
BEGIN:VEVENT
DTSTART:20151118T163000Z
DTEND:20151118T180000Z
LOCATION:Ballroom E
DESCRIPTION;ENCODING=QUOTED-PRINTABLE:ABSTRACT: Accurate simulation of turbulent flows presents significant challenges for both computation and visualization, with length and time scales often spanning 6 orders of magnitude in applied cases. Multi-resolution wavelet analysis is an emerging method for dynamically adaptive simulation, offering compression rates greater than 95% with less than 1% error, however the extreme levels of detail still present challenges for visualization.=0A=0AThese challenges require rendering of multi-resolution data directly in order to avoid an explosion in computation and memory cost. Unfortunately, a wavelet grid is ill-suited to direct visualization. By identifying the opportunity to exploit topological similarities between wavelet grids and octrees, using a multi-resolution data structure known as a VDB-tree, it is possible to adapt the simulation-optimal grid such that it may directly be visualized.=0A=0ATo demonstrate this technique, we set up a series of shear-flow simulations which develop turbulent Kelvin-Helmholtz instabilities. Accurate simulation of these instabilities requires extremely fine resolution, as the smallest scales couple strongly with the large. We show how direct multi-resolution rendering enables visualization pipelines for simulations with between 14 and 17 levels of detail at near-interactive frame rates. This represents a scale-factor of over 100,000 between the smallest and largest structures, with individual frames being generated in less than 1 second.=0A=0AThe use of VDB structures is common in professional and production-quality rendering engines such as Houdini, RenderMan and OptiX, and we show how one of these (OptiX) is enabled by this technique to perform real-time ray tracing on multi-resolution data.
SUMMARY:Extreme Multi-Resolution Visualization: A Challenge On Many Levels
PRIORITY:3
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