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Interactive display of molecular models using a microcomputer systemA simple, microcomputer-based, interactive graphics display system has been developed for the presentation of perspective views of wire frame molecular models. The display system is based on a TERAK 8510a graphics computer system with a display unit consisting of microprocessor, television display and keyboard subsystems. The operating system includes a screen editor, file manager, PASCAL and BASIC compilers and command options for linking and executing programs. The graphics program, written in USCD PASCAL, involves the centering of the coordinate system, the transformation of centered model coordinates into homogeneous coordinates, the construction of a viewing transformation matrix to operate on the coordinates, clipping invisible points, perspective transformation and scaling to screen coordinates; commands available include ZOOM, ROTATE, RESET, and CHANGEVIEW. Data file structure was chosen to minimize the amount of disk storage space. Despite the inherent slowness of the system, its low cost and flexibility suggests general applicability.
Document ID
19810057734
Document Type
Reprint (Version printed in journal)
Authors
Egan, J. T. (NASA Ames Research Center Moffett Field, CA, United States)
Macelroy, R. D. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 11, 2013
Publication Date
December 1, 1980
Publication Information
Publication: Computer Programs in Biomedicine
Volume: 12
Subject Category
COMPUTER OPERATIONS AND HARDWARE
Distribution Limits
Public
Copyright
Other