Accession Number : AD0818048

Title :   JOMREAD, A COMPUTER CODE DESIGNED TO CHECK 3D GEOMETRIES.

Descriptive Note : Technical rept. May 66-Apr 67,

Corporate Author : AIR FORCE WEAPONS LAB KIRTLAND AFB NM

Personal Author(s) : Cahill, Ronald J. ; Spitale, Guy C. ; Yoder, James F.

Report Date : JUN 1967

Pagination or Media Count : 80

Abstract : Program JOMREAD is a computer code designed to check any 3D geometry composed of and constructed with quadratic surfaces. A manual check could become very time consuming because a set of quadratic surfaces is not enough to fully describe a 3D geometry. It is also necessary that the following be present: (1) a grid network to help subdivide the spacial volume of interest, (2) a list of which surfaces are relevant to each volume and (3) identifiers to indicate on which side of the surface the volume of interest lies, (4) identifiers for the type (media) of volume. All of this information must be put onto punched cards and in describing a complex geometrical configuration, hundreds of punched cards would have to be used. Hand checking all of these cards would be extremely time consuming and still would not ensure elimination of subtle logical errors, e.g., reversed surfaces, missing surfaces, etc. Therefore it is necessary to devise a means of visually checking the geometry actually described by a punched geometry deck. JOMREAD accomplishes this by plotting out cross sections of a 3D geometry seen by intersecting planes perpendicular to the X, Y, or Z axes. These plots can then be studied and checked against the desired description. A problem consisting of a single volume unit of five or six sectors requires approximately one minute of computer time for completion. The running time for JOMREAD is directly dependent on the number of sectors in each volume unit. (Author)

Descriptors :   *GEOMETRIC FORMS), (*COMPUTER PROGRAMS, SUBROUTINES, FLOW CHARTING, PUNCHED CARDS, PROGRAMMING LANGUAGES, GEOMETRY, VOLUME.

Subject Categories : Theoretical Mathematics
      Computer Programming and Software
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE