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|
#!/bin/bash
#
# Convenient BRL-CAD to G-Code (RS274NGC) converter script
#
# Copyright (c) 2009 Michael Buesch <mb@bu3sch.de>
# Licensed under the GNU/GPL version 2 or later.
#
# Below you can define alternative paths to the conversion tools
# Default is to use the tool found in $PATH
# BRL-CAD G-to-VRML conversion tool
G2VRML="g-vrml"
# VRML to PGM conversion tool
MESH2HMAP="mesh2hmap"
# PGM to PNG conversion tool
PGM2PNG="pnmtopng"
# Image to GCODE conversion tool
IMAGE2GCODE="image-to-gcode"
# GNU bc calculator
BC="bc"
tmp_prefix="/tmp/brlcad2gcode-$RANDOM"
log_file="$tmp_prefix.log"
vrml_file="$tmp_prefix.vrml"
pgm_file="$tmp_prefix.pgm"
png_file="$tmp_prefix.png"
function cleanup
{
rm -f ${log_file}
rm -f ${vrml_file}
rm -f ${pgm_file}
rm -f ${png_file}
}
# cleanup_and_exit(exit_code)
function cleanup_and_exit
{
cleanup
exit $1
}
function sigterm
{
echo "Terminating."
cleanup_and_exit 1
}
trap sigterm TERM INT
cleanup
# check_tool(tool, args, expected_return_code, install_hint, debian_package)
function check_tool
{
local tool="$1"
local args="$2"
local expected_return="$3"
local install_hint="$4"
local debian_package="$5"
$tool $args > ${log_file} 2>&1
res=$?
if [ $res -ne $expected_return ]; then
cat ${log_file}
echo
echo "ERROR: Failed to probe $tool"
echo "Please install $install_hint"
if [ -n "$debian_package" ]; then
echo
echo "If you are running Debian Linux, please run the"
echo "following command (as root) to install the package:"
echo " apt-get install $debian_package"
fi
cleanup_and_exit 1
fi
}
check_tool $G2VRML --help 1 "'BRL-CAD' (http://brlcad.org/)" ""
check_tool $MESH2HMAP --help 0 "'mesh2hmap' (http://mesh2hmap.sf.net/)" ""
check_tool $PGM2PNG --help 1 "'netpbm' (http://netpbm.sf.net/)" "netpbm"
check_tool $IMAGE2GCODE /dev/zero 1 "'EMC2' (http://linuxcnc.org/)" ""
check_tool $BC --help 0 "'GNU bc' (http://www.gnu.org/software/bc/)" "bc"
function usage
{
echo "BRL-CAD to GCODE (RS274NGC) converter"
echo
echo "Usage: $0 [options] brlcad_db.g brlcad-db-object gcode.ngc"
echo
echo "Valid options are:"
echo " --proj PLANE The projection axis plane in the 3D data used"
echo " for the height in the heightmap."
echo " PLANE may be either of:"
echo " +z -z +y -y +x -x"
echo " +z is default"
echo " --imperial If set, use imperial units (inch) instead of metric"
echo " units (mm)."
echo " --meshres RES Resolution (in units; see --imperial) for the mesh."
echo " You also need to specify this value in the"
echo " image-to-gcode dialog 'Pixel size' field!"
}
METRIC=1
projection="+z"
meshres=
brlcad_g_file=
brlcad_g_object=
ngc_file=
# Parse commandline args
while [ $# -gt 0 ]; do
case "$1" in
--proj)
shift
if [ $# -lt 1 ]; then
echo "Missing argument to --proj"
cleanup_and_exit 1
fi
projection="$1"
case "$projection" in
"+z" | "-z" | "+y" | "-y" | "+x" | "-x" )
;;
*)
echo "Invalid --proj plane. Must be one of +z -z +y -y +x -x"
cleanup_and_exit 1
;;
esac
;;
--imperial)
METRIC=0
;;
--meshres)
shift
if [ $# -lt 1 ]; then
echo "Missing argument to --meshres"
cleanup_and_exit 1
fi
meshres="$1"
;;
*)
if [ $# -ne 3 ]; then
usage
cleanup_and_exit 1
fi
brlcad_g_file="$1"
brlcad_g_object="$2"
ngc_file="$3"
break
;;
esac
shift
done
if [ -z "$brlcad_g_file" -o -z "$brlcad_g_object" -o -z "$ngc_file" ]; then
usage
cleanup_and_exit 1
fi
if ! [ -r "${brlcad_g_file}" ]; then
echo "ERROR: Could not read input .g file ${brlcad_g_file}"
cleanup_and_exit 1
fi
if [ $METRIC -eq 0 ]; then
UNITS="inch"
else
UNITS="mm"
fi
if [ -z "$meshres" ]; then
if [ $METRIC -eq 0 ]; then
meshres="0.004"
else
meshres="0.100"
fi
fi
# Convert the BRL-CAD database to VRML
echo "Converting BRL-CAD database object to VRML..."
$G2VRML ${brlcad_g_file} ${brlcad_g_object} > ${vrml_file}
res=$?
if [ $res -ne 0 ]; then
echo "BRL-CAD to VRML conversion failed: $res"
cleanup_and_exit 1
fi
# Convert the VRML file to a PGM image
r="$meshres"
if [ $METRIC -eq 0 ]; then
r=$(echo "scale=6; $r * 25.4" | bc)
fi
echo "Converting VRML to PGM image (Mesh resolution = $r mm)..."
$MESH2HMAP "--normal=$projection" "--m-pix=$r" ${vrml_file} ${pgm_file} > ${log_file} 2>&1
res=$?
if [ $res -ne 0 ]; then
cat ${log_file}
echo "VRML to PGM conversion failed: $res"
cleanup_and_exit 1
fi
# Convert the PGM image to a PNG image
echo "Converting PGM image to PNG image..."
$PGM2PNG ${pgm_file} > ${png_file}
res=$?
if [ $res -ne 0 ]; then
echo "PGM to PNG conversion failed: $res"
cleanup_and_exit 1
fi
# Convert PNG image to GCODE
echo "Converting PNG image to GCODE..."
echo; echo
echo "--- IMPORTANT ---"
echo "Please use $meshres $UNITS as 'Pixel size' inside of the following dialog box."
echo "--- IMPORTANT ---"
echo; echo
$IMAGE2GCODE ${png_file} > ${ngc_file}
res=$?
if [ $res -ne 0 ]; then
echo "PNG to GCODE conversion failed: $res"
rm -f ${ngc_file}
cleanup_and_exit 1
fi
# Done! :)
cleanup_and_exit 0
|
