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ray casting

   Also found in: Wikipedia 0.01 sec.
(graphics)ray casting - A simplified form of ray tracing. A ray is fired from each pixel in the view plane, and information is accumulated from all the voxels in the volume data it intersects.

Each voxel is first given an associated colour and opacity. The ray is sampled at a fixed number of evenly spaced locations and the colour and opacity are trilinearly interpolated from the eight nearest voxels. These are then composed linearly back to front to give a single colour for the pixel.

Ray casting was invented by John Carmack for the game Wolfenstein 3D. It is faster and lower quality than ray tracing, and is ideal for interactive applications. It parallelises well, although random access is needed to the voxels.
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Some specific topics explored include certified meshing of families of isosurfaces, automatic generation of bas-reliefs from 3D shapes, deforming surface simplification based on dynamic geometry sampling, and topological correction of hypertextured implicit surfaces for ray casting.
Shape modeling and applications; proceedings by SciTech Book News
5 release of Havok Physics, CD Projekt RED will leverage Havok's new high speed ray casting solution and a fully optimized multicore Continuous Physics solution.
CD Projekt RED Licenses Havok Complete by Business Wire
The 17 chapters discuss theoretical background and basic approaches, GPU programming and GPU-based volume rendering, transfer functions, local and global volume illumination, ray casting, segmented volume data and large volume data, and non-photorealistic and illustrative techniques, among other topics.
Real-time volume graphics by SciTech Book News
 
 
 
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