one may represent the ray aswhereis a line through the point andis the direction vector of the ray. The equation for the intersection of a ray with a quadric surface is then represented asyielding the same quadratic equation in t.

The normal to any point on the surface is

Quadric surface patches in graphical ray tracing

In computer graphics, the visual representation of mathematically modeled objects is frequently determined by ray tracing. Frequently, the surfaces

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