ray casting

(redirected from Raycasting)

ray casting

(graphics)
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.
References in periodicals archive ?
Ertl, "Spectral volume rendering using GPU-based raycasting," The Visual Computer, vol.
Advanced illumination techniques for GPU-based volume raycasting," presented at the ACM SIGGRAPH 2009 Courses, New Orleans, Louisiana, 2009.
Duke officials report the new RayCasting Engine (RCE) promises to profoundly affect the field of mechanical design.
The RayCasting Engine (RCE) offers one potentially powerful approach to breaking this intensity barrier.
Classification machines, exemplified by the RayCasting Engine described in this article.
The RayCasting Engine traces its origins to the Production Automation Project (PAP), a research team that worked at the University of Rochester from 1972 to 1986 and did pioneering work in solid modeling.
A programming interface for the RayCasting Engine has been built into the PADL-2 modeler at Cornell and replicated at Duke.
I have dabbled with several 3D APIs, as well as writing polygon rendering and raycasting routines from scratch.