# 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.

## 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.

Compare: radiosity.

Usenet newsgroup: news:comp.graphics.raytracing.

http://directory.google.com/Top/Computers/Software/Graphics/3D/Ray_Tracing/.

## 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 ?
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.
More than hardware upgrades, the new PlayStation is said to use ray tracing technology for reading its disks for faster loading speeds.
Stating that he still remains concerned that consensus forecasts for AMD in the second half of 2019 are too high, Moore acknowledges that "being cautious on the stock has obviously been the wrong call." Given that Intel's (INTC) comeback is "at best deferred" and Nvidia's (NVDA) investment in ray tracing will have a longer-term payoff, Moore tells investors that he now thinks the 2018-19 opportunity sets the table for a period of sustained profits for AMD.
Incorporating NVIDIA's Turing architecture, the RTX 2060 promises to deliver 60% faster performance on current titles than the previous-generation GTX 1060 and the GTX 1070 Ti, while boasting a graphics quality enhanced by ray tracing and AI capabilities.
Currently, traveltime calculation methods can mainly be divided into three kinds, including ray-based methods, finite difference methods, and new ray tracing methods based on graph processing techniques.
For more than 2,000 years, optical modelling and design has been based on versions of ray tracing. However, such techniques have limitations when designing components containing micro- and nanostructures.
Unveiled by NVIDIA founder and CEO Jensen Huang at the annual SIGGRAPH conference, the NVIDIA Quadro RTX 8000, Quadro RTX 6000 and Quadro RTX 5000 GPUs bring hardware-accelerated ray tracing, AI, advanced shading and simulation to creative professionals.
Real-Time Ray Tracing: Peek into the future of real-time graphics with a live demonstration of real-time raytracing in Unreal Engine 4 using Microsoft's new DXR framework and NVIDIA RTX technology for Volta GPUs running on an NVIDIA DGX Station.
The Quadro GV100 will offer a pair of NVLink connectors for quick low-latency connections and are the major GPUs that'll be used for Nvidia's RTX ray tracing technology.

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