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Ray Tracing from the Ground Up

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Ray Tracing from the Ground Up, 9781568812724 (1568812728), AK Peter, 2007
Computer graphics involves simulating the distribution of light in a 3D environment. There are only a few fundamentally different algorithms that have survived the test of time. They can be loosely classified into projective algorithms and image-space algorithms. The former class projects each geo metric primitive onto the image plane, with local shading taking care of the appearance of objects. This class of algorithm is still widely used because it is amenable to pipeline processing and therefore to hardware implementation as evidenced by all modern graphics cards.

Image-space algorithms compute the color of each pixel by figuring out where the light came from for that pixel. Here, the basic operation is to deter mine the nearest object along a line of sight. Following light back along a line has given this basic operation and the associated image-synthesis algorithm their name: ray tracing.

In 1980, ray tracing was at the forefront of science. The quality of the images that can be computed with ray tracing was an eye opener, as it natu rally includes light paths such as specular reflection and transmission, which are difficult to compute with projective algorithms. Some shapes are easier to intersect rays with than others, and in those early days, spheres featured heav ily in ray-traced images. Hence, old images often contained shiny spheres to demonstrate the power of ray tracing.
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