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.
Calculation of the paths followed by rays of light through an optical system, using Snell's law and trigonometrical formulas.

ray tracing

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.

Compare: radiosity.

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.)
References in periodicals archive ?
Ray tracing [6], [7] method is performed in the modeling scheme.
Contract awarded for (Alex-Randomness)-Optical Ray Tracing Software
The topics include creating and editing objects, world settings, rendering and ray tracing, nurbs and metashapes, child/parent relationships and constraints, shape key and action editors, fluid and smoke simulation, the Blender game engine, video sequence editor: making a movie, and installing add-ons.
In addition, the reception environment in an actual urban area was modeled using 3D maps and ray tracing, and the arrival directions of FM waves were calculated numerically, verifying the accuracy of MUSIC method estimation.
In fact, aberrations more or less exist and will directly affect the imaging process through ray tracing.
Stavrou, "3D ray tracing for device-independent fingerprint-based positioning in WLANs," Positioning Navigation and Communication, vol.
Based in Houston, Texas, Tracey Technologies has produced devices integrating ray tracing aberrometry wavefront analysis with advanced corneal topography analysis for a decade, with the iTrace series of products offered since 2008.
The PowerVR Wizard GPU, MacRumors said, is "a range of IP processors that offer high-performance ray tracing, graphics and compute in a power envelope suitable for mobile and embedded use cases.
A New Parallel Approach for 3D Ray Tracing Techniques in the Radio Propagation Prediction.
In this paper, we compare the attenuation constant computed based on three different methods: the modal method, ray tracing method, and measurement.
The deterministic model is based on the theory of electromagnetic wave propagation, and two methods are generally used: ray tracing method and finite difference time domain method.
For estimation through simulation, the ray tracing based methods are very popular and widely used [1-6].