Raytracing: A Gentle Introduction ( page 3 )

The introduction is over: grinding out equations, code & images.

Yet another raytraced sphere? Well, there are only 6 curves that are easy to raytrace ( the Quadric surfaces ) and the sphere is the most common in the real world, so that's our first choise. The Quadrics can be described algebraically with just the sum of a few squares.

It's easy! That's a quarter of the essential functions in my demo program.

The Quadric Surfaces: six shapes easy to raytrace

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