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NWG J. Postel, V. Cerf RFC # 174 UCLA-NMC NIC # 6799 Computer Science Categories: D.6,I.1 8 June 71 References: 134 Obsoletes: none

              UCLA-Computer Science Graphics Overview

I. Hardware

 A.  Imlac PDS-1
    We have 2 PDS-1 graphics consoles each with 8K 16 bit words
    of memory.
    The display screens are mounted with the long axis vertical.
 B.  DEC 340
    We have a DEC 340 Display Station with a light pen.  Associ-
    ated with the station are a Rand Tablet and a Lincoln Wand.
    There is a display processor which drives the DEC 340 which
    reads its instruction from the XDS Sigma 7 memory via dedi-
    cated memory port.

II. Software

 A.  Imlacs
    We have not as yet developed any software for the PDS-1.
    We have used the Imlac provided text and graphics support
    software to utilize the PDS-1's as alphameric and limited
    graphics consoles (at 1200 baud).
    These are used only with the SEX timesharing system.
 B.  DEC 340
    We have over several years developed a package of Library
    routines* which interface to FORTRAN programs for use with
    the DEC 340 and its associated devices.  This station is
    used only with a stand alone system (RAD 75).
    Several programs have been implemented using these facilities
    among them are:

*SMOG (sub-program manager for On-Line Graphics).

                                                              [Page 1]

NWG J. Postel, V. Cerf RFC # 174 UCLA-NMC NIC # 6799 Computer Science

                                                   8 June 71
       1. MOSAIC
          MOSAIC is an experimental computer graphics program
          which permits a user to manipulate the parameters of
          a fairly complex polar co-ordinate equation. The ob-
          ject is to explore the space of interesting images
          which can be produced.  Library facilities are provid-
          ed so that the user can save interesting images.  He
          can also combine the images in many ways to form mo-
          saic-like patterns.  An Arriflex 16mm camera can be
          driven through the use of this program, and we have
          used the system to generate several films which serv-
          ed as a basis for video-graphics experiments (TV video-
       2. FISHEYE
          Using the interactive part of MOSAIC, and a peculiar,
          exponential mapping function, studies were made in the
          presentation of CRT images too large to fit in normal
          form on our 10" scope.  The images are mapped in such
          a way that part of the image is shown at linear scale,
          the remainder being squeezed up at the outer edges of
          the screen.  Thus, the global image is always visible,
          but details are apparent mainly in the linear region.
          This study formed the basis of an M.S. thesis.
       3. MOVIE
          This is a movie script language which allows the user
          to compose a scenario describing the entrance and exit
          of images on the CRT.  Mosaics can be created.  Images
          can fade-in, fade-out, dissolve, expand, zoom, contract,
          Dramatis personae (in the form of MOSAIC images) can
          be defined and their movements described.  The program
          computes the movements of all images for the duration
          of the film and then calls on the MOSAIC generating
          routines to make the film.  Camera control is automa-
                                                              [Page 2]

NWG J. Postel, V. Cerf RFC # 174 UCLA-NMC NIC # 6799 Computer Science

                                                   8 June 71

III. Intentions

 A. Imlacs
    We intend to equip our PDS-1's with the mouse and keyset
    configuration used at SRI-ARC.  We intend to attempt to
    make use of PDS-1 programs developed at other sites.  We
    intend to develop an assembler for PDS-1 programs.  We are
    thinking about a subroutine Library for PDS-1 graphics for
    FORTRAN (or other higher level languages).
 B. DEC 340
    We intend eventually to bring the DEC 340 hardware and soft-
    ware facilities into the SEX system.
    [ This RFC was put into machine readable form for entry ]
    [ into the online RFC archives by Ignacio Goyret 6/97 ]
                                                              [Page 3]
/data/webs/external/dokuwiki/data/pages/rfc/rfc174.txt · Last modified: 1997/06/12 18:32 (external edit)