QUADRIL: A computer language for the description of quadric-surface bodies

@inproceedings{Levin1980QUADRILAC,
  title={QUADRIL: A computer language for the description of quadric-surface bodies},
  author={Joshua Z. Levin},
  booktitle={SIGGRAPH},
  year={1980}
}
Most man-made objects can be closely approximated by bodies whose surfaces are composed of portions of second-order (quadric) surfaces. These surfaces include elliptic, hyperbolic, and parabolic cylinders, as well as quadric cones, paraboloids, hyperboloids, ellipsoids, and pairs of planes. Simple planes (first-order surfaces) may be included as degenerate quadric surfaces. Because these quadric-surface bodies are so useful for modelling man-made objects, it is important that any Computer… CONTINUE READING