We present visibility computation and data organization algorithms that enable high-fidelity
walkthroughs of large 3D geometric datasets. A novel feature of our walkthrough system
is that it performs work propotional only to the required detail in visible geometry
at the rendering time. To accomplish this, we use a pre-computation phase that efficiently
generates per-cell vLOD: the geometry visible from a view-region at the right level of
detail. We encode changes between neighboring cells' vLODs, which are not
required to be memory resident. At the rendering time, we incrementally construct
the vLOD for the current view-cell and render it. We have a small CPU and memory
requirement for rendering and are able to display models with tens of million
polygons at interactive frame rates with less than one pixel screen-space deviation
and accurate visibility.
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