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Lexikon


ray casting


A simplified form of ef="module.php?name=Lexikon&file=search&eid=1&query=ray tracing">ray tracing. A ray is fired from each ef="module.php?name=Lexikon&file=search&eid=1&query=pixel">pixel in the view plane, and information is accumulated from all the ef="module.php?name=Lexikon&file=search&eid=1&query=voxels">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 ef="module.php?name=Lexikon&file=search&eid=1&query=Wolfenstein 3D">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. (2004-01-06)

e="border-width:thin; border-color:#333333; border-style:dashed; padding:5px;" align="left">In addition suitable contents:
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