# ray tracing

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## ray tracing

[′rā ‚trās·iŋ]
(computer science)
The creation of reflections, refractions, and shadows in a graphics image by following a series of rays from a light source and determining the effect of light on each pixel in the image.
(optics)
Calculation of the paths followed by rays of light through an optical system, using Snell's law and trigonometrical formulas.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

## ray tracing

(graphics)
A technique used in computer graphics to create realistic images by calculating the paths taken by rays of light entering the observer's eye at different angles. The paths are traced backward from the viewpoint, through a point (a pixel) in the image plane until they hit some object in the scene or go off to infinity. Objects are modelled as collections of abutting surfaces which may be rectangles, triangles, or more complicated shapes such as 3D splines. The optical properties of different surfaces (colour, reflectance, transmitance, refraction, texture) also affect how it will contribute to the colour and brightness of the ray. The position, colour, and brightness of light sources, including ambient lighting, is also taken into account.

Ray tracing is an ideal application for parallel processing since there are many pixels, each of whose values is independent and can thus be calculated in parallel.

Usenet newsgroup: news:comp.graphics.raytracing.

## ray tracing

A rendering method that simulates light reflections, refractions and shadows. It follows a light path from a specific source and computes each pixel in the image to simulate the effect of the light. It is a very process-intensive operation. See reflection mapping and radiosity.

Ray-Traced Image Many of the first graphics simulations were done at the University of Utah, and this is one of them. The shadows in this picture were created by software algorithms that simulate a beam of light from a designated source. (Image courtesy of Computer Sciences Department, University of Utah.)

Modern-day Ray Tracing This image created in MicroStation Modeler and rendered in the MasterPiece visualization program contains the kinds of realistic shadows and reflections that make a digital object photorealistic. As good as this looks, this picture was reduced to only 256 colors for online and CD-ROM presentation. (Image courtesy of Bentley Systems, Inc.)

The Most Realistic Although incredibly computation intensive, ray tracing provides the most realistic shadows, reflections and refractions. (Image courtesy of Intergraph Computer Systems.)
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References in periodicals archive ?
All three games supported Real-Time Ray Tracing and Deep Learning Super Sampling (DLSS), but the RTX component was fixed for each game.
Summary: California [USA], August 19 (ANI): Minecraft is getting a new update that will make it visually more engaging with realistic lighting and colour using real-time ray tracing technique.
"Real-time ray tracing is the most important graphics innovation in a decade.
Nvidia says it will deliver best-in-class gaming performance and real time ray tracing for today's and next-generation games which are the result of nearly a year of architectural and process optimizations after the initial RTX line was released.