An Introduction to Ray Tracing (The Morgan Kaufmann Series by Eric Haines

By Eric Haines

The construction of ever extra real looking 3-D photos is crucial to the improvement of special effects. The ray tracing process has develop into probably the most well known and strong skill during which photo-realistic photos can now be created. The simplicity, splendor and straightforwardness of implementation makes ray tracing a vital a part of knowing and exploiting state of the art machine graphics.
An advent to Ray Tracing develops from basic rules to complex functions, delivering "how-to" methods in addition to an in depth figuring out of the clinical foundations of ray tracing. it's also richly illustrated with four-color and black-and-white plates. this can be a booklet for you to be welcomed through all considering glossy special effects, photo processing, and computer-aided design.

  • Provides useful "how-to" information
  • Contains top of the range colour plates of pictures created utilizing ray tracing techniques
  • Progresses from a simple figuring out to the complicated technological know-how and alertness of ray tracing

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Additional resources for An Introduction to Ray Tracing (The Morgan Kaufmann Series in Computer Graphics)

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We' ll need at least 1 6 rays, j ust to get one of each color. It's not clear from the above discussion how to detect when we need more samples, nor how to go about getting them. 4. 7 Statistical Supersampling One way to try getting just the right number of rays per pixel is to watch the rays as they come in. Imagine a pixel which has had four rays sent through it, distributed uniformly across the pixel . We can stop sampling if those four rays are a ' good enough' estimate of what's really out there .

6. Bui-Tuong Phong, Illumination for computer generated pictures. Commun. A CM 1 8(6), June 1 9 7 5 [SH] . 7 . Clark, J . H . , Hierarchical geometric models for visible surface algorithms. Commun. A CM 19(10), October 1 976 [EF] . 8 . Cook, R . L. and Torrance, K . E . , A reflectance model for computer graphics. A CM Trans. Graph. 1 ( 1 ) , January 1 982 [SH] . 9 . Cook, R . L. , Porter, T. and Carpenter, L . , Distributed ray tracing. Siggraph ' 84 [RT] . 1 0 . Crow, F. C . , 'The aliasing problem in computer-generated shaded images.

Even for very small objects this can be extremely distracting, especially if they happen to contrast strongly with the background (like white stars in black space). Another bad problem is what happens to some edges. Figure 17 shows a horizontal edge moving slowly up the screen . Every few frames, it rises from 22 An Overvie w of Ra y Tracing Time : No. revolutions: t=0 t=i f=� 0 1 ii 6 2 t=� 3 i t=� t =i f= , 4 6 (a ) No. revolution s : 0 1 3 2 (b) N o. revolutions : 0 2� 5 (c ) Fig. 1 6 . A spinning wheel sampled at a constant 6 samples per second.

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