Visual image is generated on cathode-ray tube screen to scale and is constructed according to dimensions of specified craft. Once displayed, image may be manipulated by several different means

Hayes, S. R.

English

NASA Technical Reports Server

July 1974
	 B74-10040 
NASA TECH BRIEF 
Marshall Space Flight Center 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Graphics Shadowing Analysis 
The problem: 
It was necessary to investigate the local shadowing 
phenomena on the solar Skylab vehicle. 
The solution: 
The investigation led to the development of a graphic 
display of the solar Skylab vehicle on a cathode-ray tube 
(CRT) screen which is generated by a program that 
produces shadows corresponding to the solar shadows. 
How it's done: 
The visual image that is generated on a CRT screen 
is to scale and is constructed according to the dimensions 
of the specified craft. Once displayed, the image may be 
manipulated by several different means. 
The image itself can consist of: (a) the multiple-
docking adapter (MDA); (b) the active portions of the 
two solar array panels and the aft surfaces of their 
beam supports; (c) the Apollo Telescope Mount (ATM) 
solar panels; (d) the docked Command Service Module 
(CSM); or (e) the lower surface of the ATM support,
which appears as a visual aid between the ATM panels 
and the MDA. 
Notes: 
1. This program was written in FORTRAN IV (64%) 
and ASSEMBLER (36%) for use on the IBM 360/370 
computer with the IBM 2250 graphic display. 
2. Inquiries concerning this program should be directed 
to:
COSMIC 
112 Barrow Hall 
University of Georgia 
Athens, Georgia 30601 
Reference: MFS-2 1406
Source: S. R. Hayes of
McDonnell Douglas Astronautics Co.

under contract to

Marshall Space Flight Center
(MFS-2 1406) 
Category 09,03 
This document was prepared under the sponsorship of the Natidnal	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States 	 will be free from privately owned rights.
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Graphics shadowing analysis

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