“Simulation of natural scenes using textured quadric surfaces” by Gardner

Because of the high complexity of the real world, realistic
simulation of natural scenes is very costly in computation. The
topographical subtlety of common natural features such as trees and
clouds remains a stumbling block to cost-effective computer
modeling. A new scene model, composed of quadric surfaces bounded
with planes and overlaid with texturing, provides an efficient and
effective means of representing a wide range, of natural features.
The new model provides a compact and functional data base which
minimizes the number of scene elements. Efficient hidden surface
algorithms for quadric surfaces bounded by planes are included. A
mathematical texturing function represents natural surface detail
in a statistical manner. Techniques have been developed to simulate
natural scenes with the artistic efficiency of an impressionist
painter.

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