Topic       : ATARI ST Picture formats
Author      : David Baggett/Jan K⌐upka
Version     : atari_gf.hyp 0.01 (17/09/96)
Subject     : Documentation/File formats
Nodes       : 52
Index Size  : 1328
HCP-Version : 3
Compiled on : Atari
@charset    : atarist
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@options    : -i -s +y +z
@width      : 75  Spin Template File Format        *.SPN

  The CAD-3D spin tool template file is a convenient way to store
often-used templates for spun objects.  It is an ideal way to send
a simple spun object to another user of CAD-3D 2.0 (they cannot be used by
CAD-3D 1.0), since the compact template file is smaller than the resulting
3D object, making transmission via telecommunications network an economical
option.

  The template file contains all information necessary to create a spun
object except for the number of degrees or the percentage for a partial
spin. The file contains the number  of points in the template, the number
of segments, a flag which tells whether or not the first point is connected
to the last, and the actual coordinate data for the template.

  The format of the file is as follows:

1 wordword = 2 bytes
    Number of points in the template, a number from 1 to 99.

1 wordword = 2 bytes
    Number of segments in the spun object, a number from 1 to 48.
          Note that segment values less than 3 may not execute in partial
          or full spin operations.

1 wordword = 2 bytes
    Connect flag.  0 indicates that the first point and the last
          point are not connected, 1 indicates that they are connected.
          When a template is loaded, the "Connect" selection in the
          drop-down menu will be set to the appropriate setting.

The following section of the file is a table of the X coordinates of all
the points in the template.  There are n words in this table, where n is
the number of points in the template, specified in the first wordword = 2 bytes
 of the
file.

n words   The values of the X coordinates of the points in the spin
          template.  These values range from 0 to 300.  A value of zero
          indicates that the point lies on the spin tool's central axis
          at the center of the spin tool window; a value of 300 indicates
          that the point lies at the far right of the window.

The following section of the file is a table of the Y coordinates of all
the points in the template.  There are n WORDs in this table, where n is
the number of points in the template, specified in the first wordword = 2 bytes
 of the
file.

n words   The values of the Y coordinates of the points in the spin
          template.  These values range from -150 to 150. A value of -150
          indicates that the point lies at the top of the spin tool window;
          a value of 150 indicates that the point lies at the bottom of
          the window.