NDLI: Vectorized procedural models for natural terrain:Waves and islands in the sunset

Content Provider	ACM Digital Library
Author	Max, Nelson L.
Abstract	A ray-tracing procedural model is described, in which ocean waves and islands are rendered by different but related algorithms. The algorithms are based on analytic formulas involving arithmetic operations, trigonometric functions, and square roots, and are organized for a vectorizing compiler on a Cray 1, a “supercomputer” with a vector pipeline architecture. Height field methods are used, one vertical scan line at a time, to trace the direct rays to the ocean, where they are reflected. Approximate methods are then applied to find whether the reflected rays meet any other object on their way to the sky. The output, at eight bits per pixel, gives information for shading, e.g. the angle of the surface normal for rays meeting the islands, or the angle of elevation from the horizon for rays continuing unobstructed to the sky. The output is recorded on a magnetic tape for each frame in one cycle of the wave motion, and plotted offline on a Dicomed D-48 color film recorder. The eight bits per pixel are interpreted by a color translation table, which is gradually changed as the wave cycle is repeated to simulate the changing illumination during sunset.
Starting Page	317
Ending Page	324
Page Count	8
File Format	PDF
ISSN	00978930
DOI	10.1145/965161.806820
Journal	ACM SIGGRAPH Computer Graphics (COMG)
Volume Number	15
Issue Number	3
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1988-08-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Water waves Natural terrain Vectorized Ray tracing Line buffer Reflection Height field Procedural model Color table animation Piercing Pipeline
Content Type	Text
Resource Type	Article
Subject	Computer Science Computer Graphics and Computer-Aided Design

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