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- POLY3D-H - 3d polygonal hidden line removal
- -------------------------------------------
-
- BECAUSE POLY3D-H IS LICENSED FREE OF CHARGE, I PROVIDE ABSOLUTELY NO
- WARRANTY, TO THE EXTENT PERMITTED BY APPLICABLE STATE LAW. EXCEPT WHEN
- OTHERWISE STATED IN WRITING, I GERSHON ELBER PROVIDE POLY3D-H PROGRAM "AS IS"
- WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT
- NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
- PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
- PROGRAM IS WITH YOU. SHOULD THE POLY3D-H PROGRAM PROVE DEFECTIVE, YOU ASSUME
- THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
-
- IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW WILL GERSHON ELBER,
- BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY LOST PROFITS, LOST MONIES,
- OR OTHER SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
- USE OR INABILITY TO USE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR A
- FAILURE OF THE PROGRAM TO OPERATE WITH PROGRAMS NOT DISTRIBUTED BY GERSHON
- ELBER) THE PROGRAM, EVEN IF YOU HAVE BEEN ADVISED OF THE POSSIBILITY OF
- SUCH DAMAGES, OR FOR ANY CLAIM BY ANY OTHER PARTY.
-
- A program to remove hidden line of a given polygonal model. The
- program does 4 passes over the input:
- 1. Preprocess and map all polgons in scene, and sort them.
- 2. Generating edges out of the polygonal model and sort them (preproceesing
- for the scan line algorithm) into buckets.
- 3. Intersects edges, and split edges with non homogeneous visibility (the
- scan line algorithm)
- 4. Visibility test of each edge.
-
- This programs can handle CONVEX polygons only. See poly3d.doc,
- Appendix A, for exact text format definition. From irit given object O,
- issue the command 'O = convex(O);' to make sure object has convex polygons
- only before dumping it out.
-
- Options:
- --------
-
- poly3d-h [-b] [-m] [-i] [-e #Edges] [-o Objects...] [-v ViewFile] [-z] DFiles
- [> OutFile]
-
- -b : BackFacing - if object is closed (such models dumped from irit solid
- modeller), back facing polygons will be deleted, and therefore speed
- up the process by at list factor of two.
- -m : More - give some more information on the data file(s) parsed.
- -i : Internal edges (created by IRIT) - default is not to display them, and
- this option will force displaying them also.
- -e n : # Edges to use from each given polygon (default all). Very handy to do
- '-e 2' on data created from DRAWFN3D.
- -o Object(s) : Objects to display (all by default). Object is the name as
- appears after the OBJECT key word the data files
- (do 'grep OBJECT datafile'...).
- -v ViewFile : View file - file of the view matrix transformation
- -z : Print version number and current defaults.
-
- Configuration:
- --------------
-
- The program can be configured using a configuration file named poly3d-h.cfg.
- This is a plain ascii file you can edit directly and set the parameters
- according to the comments there. executing 'poly3d-h -z' will show the
- current configuration as read from the configuration file. This file, in
- msdos environment, can be in any directory which is in your path - the same
- place as poly3d-h.exe is probably a good choice. In unix environment, this
- file is searched in current directory, or if an environment variable IRIT_PATH
- is set, it is assumed to hold the directory to look for the config file with
- postfix '/' (i.e. 'poly3d-h.cfg' is simply appended to it.).
-
- MSDOS version:
- The program will use 80?87 (msdos only...) if it detects one - again uses
- the Turbo C 80?87 autodetect, or will run (much!) slower without it...
-
- Usage:
- ------
- As this program is not interactive, usage is quite simple, and only
- control available is using the command lines options.
-
- Bugs:
- -----
- O.k. if you do have any question, suggestion, or even want to report a bug
- feel free to send me email (see below)
-
- Feel free to make copies of this program, and distribute them FREE of
- charge, provided that all this package is distributed.
-
- Have Fun
-
- Gershon Elber
- gershon@cs.utah.edu
-