G-DXF(1)

NAME

g-dxf - BRL-CAD geometry to AutoCAD DXF converter

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SYNOPSIS
DESCRIPTION
OPTIONS
EXAMPLES
SEE ALSO
AUTHOR
COPYRIGHT
BUG REPORTS

SYNOPSIS

g-dxf [-v] [-i] [-p] [-x lvl] [-X lvl] [-a abs_tol] [-r rel_tol] [-n norm_tol] [-D dist_tol] [-P ncpus] [-o output.dxf] database.g object(s)

g-dxf converts the specified object(s) from a BRL-CAD database.g file to an AutoCAD DXF file. Each region is tessellated into triangles via the NMG boolean evaluator and written out, with one DXF layer per region colored to the nearest matching DXF color. By default geometry is emitted as 3DFACE entities; use -p to emit POLYFACE MESH entities instead. If no output file is given with -o, the DXF is written to standard output.

OPTIONS

-v: Verbose output, including object names and the tolerances in use.
-i: Output coordinates in inches instead of the default millimeters.
-p: Emit POLYFACE MESH entities instead of the default 3DFACE entities.
-x lvl: Set the librt debug flag to the given hexadecimal value.
-X lvl: Set the NMG debug flag to the given hexadecimal value.
-a abs_tol: Absolute tessellation tolerance in millimeters (the maximum chord error). Setting this disables the relative tolerance.
-r rel_tol: Relative tessellation tolerance, a fraction of the bounding box used to bound the chord error (default 0.01).
-n norm_tol: Surface normal tessellation tolerance in degrees. Setting this disables the relative tolerance.
-D dist_tol: Calculation distance tolerance in millimeters; vertices closer than this are considered identical (default 0.0005).
-P ncpus: Number of CPUs to use. Currently disabled: the value is accepted but not used.
-o output.dxf: Write to the named DXF file instead of standard output.
-h, -?: Print a usage message and exit.

EXAMPLES

Example 1. Convert geometry to a DXF file

g-dxf -o hull.dxf ship.g hull

Tessellate the hull region from ship.g and write the resulting 3DFACE entities to hull.dxf.

Example 2. Tighten tolerances and emit a polyface mesh in inches

g-dxf -p -i -a 0.1 -o turret.dxf ship.g turret

Export the turret region as POLYFACE MESH entities in inches, using a 0.1 mm absolute tessellation tolerance for a finer mesh suitable for import into AutoCAD-style packages.