Coherent multiresolution isosurface ray tracing |
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Authors: | Aaron M Knoll Ingo Wald Charles D Hansen |
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Affiliation: | (1) Scientific Computing and Imaging Institute, University of Utah, Salt Lake City, UT 84112, USA |
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Abstract: | We implement and evaluate a fast ray tracing method for rendering large structured volumes. Input data is losslessly compressed
into an octree, enabling residency in CPU main memory. We cast packets of coherent rays through a min/max acceleration structure
within the octree, employing a slice-based technique to amortize the higher cost of compressed data access. By employing a
multiresolution level of detail (LOD) scheme in conjunction with packets, coherent ray tracing can efficiently render inherently
incoherent scenes of complex data. We achieve higher performance with lesser footprint than previous isosurface ray tracers,
and deliver large frame buffers, smooth gradient normals and shadows at relatively lesser cost. In this context, we weigh
the strengths of coherent ray tracing against those of the conventional single-ray approach, and present a system that visualizes
large volumes at full data resolution on commodity computers. |
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Keywords: | Ray tracing Isosurfaces Volume data Compression Level of detail |
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