g-egg [-v89] [-x _rt_debug_] [-X _nmg_debug_] [-a _abs_tol_] [-r _rel_tol_] [-n _norm_tol_] [-D _dist_tol_] [-P _ncpu_] [-o _output.egg_] _database.g_ _object_ [_object ..._]G-EGG(1)
NAME
g-egg - convert BRL-CAD geometry to a Panda3D EGG file
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SYNOPSIS
DESCRIPTION
g-egg converts the specified geometry object(s) from a BRL-CAD
database.g to a Panda3D EGG file. Each object is tessellated into a
triangulated NMG via the boolean evaluator and written as an EGG
<Group> containing a vertex pool and the resulting polygons. The
output uses a Z-Up coordinate system.
If no output file is given with -o, the EGG data is written to standard output. A count of the triangles produced is printed to standard error on completion.
OPTIONS
- -a abs_tol
-
Absolute tessellation tolerance, in mm. Setting this disables the relative tolerance.
- -r rel_tol
-
Relative tessellation tolerance, as a fraction of the bounding box. The default is 0.01.
- -n norm_tol
-
Surface normal tessellation tolerance, in degrees. Setting this disables the relative tolerance.
- -D dist_tol
-
Calculational distance tolerance, in mm, used when deciding whether vertices are coincident.
- -P ncpu
-
Number of CPUs to use during tessellation.
- -o output.egg
-
Write output to the named file instead of standard output.
- -8
-
Use the marching cubes algorithm for facetization.
- -9
-
Use the experimental "bottess" algorithm for facetization.
- -v
-
Verbose output (printed to standard error).
- -x rt_debug
-
Set the librt debugging flags (a hexadecimal bit vector).
- -X nmg_debug
-
Set the NMG debugging flags (a hexadecimal bit vector).
- -h, -?
-
Print the usage message and exit.
EXAMPLES
Example 1. Convert objects from a database to an EGG file
g-egg -r 0.005 -o havoc.egg havoc.g body wingsTessellates the body and wings regions from havoc.g using a tighter relative tolerance of 0.005 and writes the combined Panda3D EGG model to havoc.egg, ready to be loaded into a Panda3D scene.
Example 2. Generate geometry on demand and pipe it onward
g-egg -a 0.5 moss.g all.g > moss.eggFacetizes the all.g assembly from the moss.g sample database with a 0.5 mm absolute tolerance and redirects the EGG output (which would otherwise go to standard output) into moss.egg.
SEE ALSO
brlcad(1), g-obj(1), g-stl(1), gcv(1), mged(1)
AUTHOR
BRL-CAD Team
COPYRIGHT
This software is Copyright (c) 1989-2026 by the United States Government as represented by U.S. Army Research Laboratory.
BUG REPORTS
Reports of bugs or problems should be submitted via electronic mail to devs@brlcad.org