/usr/games/xracer-mktube is in xracer-tools 0.96.9.1-8.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# XRACER (C) 1999-2000 Richard W.M. Jones <rich@annexia.org> and other AUTHORS
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
# $Id: xracer-mktube.pl,v 1.6 2000/01/02 14:13:32 rich Exp $
# You have made the basic tubular outline of the track in Blender,
# converted it to a mesh and saved it as a VideoScape file. This
# script takes that file and converts it to a list of roughly
# cylindrical segments. The result is saved as a suitable C
# file for the track, and also as an intermediate .tube file which
# is used by the other track processing scripts.
use strict;
use Getopt::Long;
use Data::Dumper;
use lib '../../XRacer/blib/lib'; # So you can run this without installing it.
use XRacer::Math;
# Read command line arguments.
my $nr_steps;
my $coutputfilename;
my $tubeoutputfilename;
my $verbose;
my $help;
GetOptions ("steps=i" => \$nr_steps,
"outputc=s" => \$coutputfilename,
"outputtube=s" => \$tubeoutputfilename,
"verbose" => \$verbose,
"help|?" => \$help);
if ($help)
{
print STDERR "$0 --steps STEPS [--outputc OUTPUTFILE] [--outputtube TUBEOUTPUTFILE] [--verbose] [INPUTFILE]\n";
print STDERR "where: STEPS is the number of vertices in each segment\n";
print STDERR " OUTPUTFILE is the C file to write\n";
print STDERR " TUBEOUTPUTFILE is the .tube file to write\n";
print STDERR " INPUTFILE is the input VideoScape file\n";
exit 1;
}
die "--steps argument is required" if !$nr_steps;
# Read input lines.
my $state = "expect 3DG1";
my $vcount;
my $nr_segments;
my @vertices = ();
while (<>)
{
s/[\n\r]+$//g; # Removes trailing CR, LF.
if ($state eq "expect 3DG1")
{
die "expecting first line to be 3DG1" if $_ ne "3DG1";
$state = "expect vcount";
}
elsif ($state eq "expect vcount")
{
die "expecting vertex count" if $_ !~ m/^[1-9][0-9]*$/;
$vcount = $_;
# Check that steps divides number of vertices.
die "number of steps must divide number of vertices ($vcount)"
if ($vcount / $nr_steps != int ($vcount / $nr_steps));
$nr_segments = $vcount / $nr_steps;
$state = "reading vertices";
}
elsif ($state eq "reading vertices")
{
my @vs = split /[ \t]+/, $_;
push @vertices, \@vs;
$vcount--;
}
last if $state eq "reading vertices" && $vcount == 0;
}
# Print a summary of the file.
print "number of vertices: ", scalar (@vertices), "\n" if $verbose;
print "number of segments: $nr_segments\n" if $verbose;
# Group the vertices by segment.
my @segments = ();
for (my $i = 0; $i < @vertices; $i += $nr_steps)
{
my @vs = ();
for (my $j = $i; $j < $i + $nr_steps; $j++)
{
push @vs, $vertices[$j];
}
my %th = ('vertices' => \@vs,
'n' => $i / $nr_steps);
push @segments, \%th;
}
# Now process the vertices in each segment to fill in the rest
# of the information for each segment in the @segments array.
my $segment;
foreach $segment (@segments)
{
my $n = $segment->{n};
my @vs = @{$segment->{vertices}};
print "segment: $n, number of vertices: ", scalar (@vs), "\n" if $verbose;
print "vertices: ", cinitializer (@vs), "\n" if $verbose;
# Compute the midpoint of the enter plane.
my $midpoint = XRacer::Math::midpoint (@vs);
print "midpoint: $midpoint->[0], $midpoint->[1], $midpoint->[2]\n"
if $verbose;
# Compute the distance from each vertex to the midpoint. It
# should be rougly the same. If not, then probably we are
# not grouping the vertices correctly into segments (ie.
# $nr_steps is wrong). Anyway, we should get the radius of
# the tube this way.
my $radius = XRacer::Math::distance ($vs[0], $midpoint);
foreach (@vs)
{
my $d = XRacer::Math::distance ($_, $midpoint);
if (abs ($radius - $d) > 0.01)
{
print STDERR "segment: $n: points do not form a circle\n";
print STDERR " This probably means that the --steps argument is wrong.\n";
print STDERR " Radius = $radius. Distance = $d.\n";
print STDERR " Point = ",
$_->[0], ", ", $_->[1], ", ", $_->[2], "\n";
exit 1;
}
}
print "radius: $radius\n" if $verbose;
# Calculate the enter plane. Assuming the points are coplanar,
# we can just take ANY three points and compute the plane. However,
# for more accuracy, take the midpoint and two points on the
# edge which form a right angle.
my $point1 = $vs[0];
my $point2 = $vs[@vs/4];
my $enterplane = XRacer::Math::plane_coefficients ($point1, $midpoint, $point2);
print "enter plane coefficients: ",
"$enterplane->[0], $enterplane->[1], $enterplane->[2], $enterplane->[3]\n"
if $verbose;
# Save all this information in the segment hash.
$segment->{midpoint} = $midpoint;
$segment->{radius} = $radius;
$segment->{enterplane} = $enterplane;
# Delete the vertices - don't need these any more, and we don't
# particularly want them dumped out into the tube file.
delete $segment->{vertices};
}
# Write out the tube file.
if ($tubeoutputfilename)
{
open TUBE, ">$tubeoutputfilename"
or die "$tubeoutputfilename: $!";
print TUBE "# This is a TUBE file for XRacer. It is automatically generated.\n";
print TUBE Dumper (\@segments);
print TUBE "# End of file.\n";
close TUBE;
}
# Write the C file.
if ($coutputfilename)
{
open C, ">$coutputfilename"
or die "$coutputfilename: $!";
print C "/* This file describes the outline tube around the track.\n * It is automatically generated.\n */\n\n#include \"common.h\"\n\n";
print C "int nr_segments = ", $nr_segments, ";\n";
print C "GLfloat midpoints[][3] = ",
cinitializer (map { $_->{midpoint} } @segments), ";\n";
print C "GLfloat radii[] = ",
cinitializer (map { $_->{radius} } @segments), ";\n";
print C "GLfloat enterplanes[][4] = ",
cinitializer (map { $_->{enterplane} } @segments), ";\n";
print C "/* End of file. */\n";
close C;
}
exit 0;
#----------------------------------------------------------------------
# This small helper function takes a list of either numbers of
# array refs, and returns an equivalent C string for initializing
# a C multi-dimensional array or structure.
sub cinitializer
{
return "{ " . join (", ",
map ({ ref ($_) eq 'ARRAY' ? cinitializer (@$_) : $_ }
@_)) . " }";
}
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