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.
[reyd] /reɪd/ adjective 1. having or represented as having emanating ; radiate: The saint was painted with a rayed, beatific face. 2. having zoological or botanical (often used in combination): a five-rayed fin. [rey] /reɪ/ noun 1. a narrow beam of light. 2. a gleam or slight manifestation: a ray of hope. 3. a raylike […]
- Ray-finned fish
[rey-find] /ˈreɪˌfɪnd/ noun 1. any of various bony fishes of the subclass Actinopterygii, having strong slender rays, excluding the coelacanth and lungfish. ray-finned fish Any of various bony fishes belonging to the subclass Actinopterygii, having fins supported by thin bony rays. Ray-finned fish evolved in the early Devonian Period and include most species of fish […]
noun, Botany. 1. one of the marginal florets surrounding the disk of tubular florets in the flower heads of certain composite plants, as the daisy. ray flower One of the narrow flowers, resembling single petals, that surround the central disk in the capitulum or flower cluster of a plant of the composite family (Asteraceae or […]
noun 1. a gun that can fire bursts of usually destructive or lethal rays: a science fiction novel whose hero has a ray gun made of gold. 2. a child’s futuristic toy gun that emits sparks, whirring noises, etc. noun 1. (in science fiction) a gun that emits rays to paralyse, stun, or destroy