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vs3d.doc
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1995-11-25
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June 4, 1989
Charles:
Here is some basic documentation for the VS3D.TTP program.
VS3D.TTP is a program designed to convert 3D object files between
the Aegis Videoscape-3D file format and the Antic CAD-3D 2.0 file
format. The program converts either file format to the other
format.
The program runs on the Atari ST computers. To use, double click
on the program's icon from the desktop, and a parameters entry
screen will appear. Enter the filename of the file(s) you wish
to convert, including drive and path if the file is in a different
directory than the current one. Wildcards are valid, but the
extension MUST be either .GEO or .3D2. For example, to convert all
of the .GEO files on drive B: to .3D2 format , enter:
b:\*.GEO
No wildcards are allowed in the drive or path names.
The program can also be run from a command-line environment. Start
the program by typing:
VS3D <filename>
where filename is the fully pathed file spec as above.
The program uses the extension you supply as the basis for the
conversion. If you entered .GEO, it converts from videoscape format
to CAD-3D format. If you enter .3D2, it converts from CAD-3D to
videoscape format. The converted file is written to the current drive
and directory.
Some notes and limitations:
There is no limit to the number of objects, vertices, or faces that
can be in a file to be converted. However, since CAD-3D and
Videoscape both have object count and complexity limitations, you
must be sure that your converted object does not exceed that program's
limits.
The converter will only convert .GEO files from Videoscape that contain
3 or 4 vertice polygons - no more complex polygons are supported. This
can be easily overcome if you have an object with complex polygons by
using interchange to convert the object to Sculpt-3D or Turbo Silver
format (which only use triangles), then convert that converted file
back to videoscape format. This has the additional advantage of
converting videoscape's "surface details" to polygons for easier
loading into CAD-3D. Alternatively, the .GEO files can be loaded
into Modeler-3D to be modified. Simply select all polygons with
more than 4 vertices, and use the subdivide command to break the
polygons down into simpler polygons.
Color palette conversion for CAD-3D to Videoscape files is done on
the assumption that all surfaces will be matte finish. Since this
limits the colors to 16 (really only 12), some of the colors may not
match "exactly", as there is not as great a range of color for
Videoscape objects as in CAD-3D.
Please let me know if you find any bugs or problems with the program,
or if there are any enhancements you would like done.
Paul LeFevre
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