#!/usr/bin/perl
#
# plysets2conf:  This program takes a bunch of ply sets, and then
# generates a conf file, which grabs the first listed ply file
# for each set, and the matrix transform. 


if (($#ARGV == -1) || ($ARGV[0] eq "-h")) {
    print STDERR "\n";
    print STDERR "Usage: plysets2conf [-l n] <1.set> <2.set> ... > all.conf\n";
    print STDERR "\n";
    print STDERR "The program will add the first-listed ply file for\n";
    print STDERR "Each set to the conf file, as well as the xf.\n";
    print STDERR "\n";
    print STDERR "  -l    Use the nth level mesh.  E.g. if n is 1,\n";
    print STDERR "        use the first mesh listed in each set file.\n";
    print STDERR "\n";
    print STDERR "Ex:  plysets2conf -l 4 a.set b.set\n";
    print STDERR "     Will generate a .conf file with level 4 of each set.\n";
    print STDERR "\n";
    exit(-1);
}

# Set a resolution level.  1 is highest, 4 is lowest
$reslev = 1;
if ($ARGV[0] eq "-l") {
    $reslev = int($ARGV[1]);
    ($reslev > 0) || die "Error: res level must be greater than 0.\n";
    # Cut first 2 arguments off the list so we ignore the number... :-)
    splice(@ARGV, 0,2);
}


for ($argc=0; $argc <= $#ARGV; $argc++) {
    $set = $ARGV[$argc];
    open(SET, $set);
    print STDERR "Using mesh $reslev of set $set...\n";
    # skip first two lines, then skip to the right reslev...
    for ($i=1; $i < 2+$reslev; $i++) {
	<SET>;
    }
    $line = <SET>;
    @words = split(' ', $line);
    # Assertion check
    if ($#words != 2) {
	print STDERR "Error: $set does not contain a mesh number $reslev.\n";
	exit(-1);
    }
    # Get directory, too
    $plydir = $set;
    while (length($plydir) > 0 && substr($plydir, -1, 1) ne "/") {
	chop $plydir;
    }

    $plyname = $words[2];
    $xf = $set;
    $xf =~ s/.set/.xf/g;
    $quat = `matrix2quat < $xf`;
    $outline = "bmesh $plydir$plyname $quat";
    print $outline;
    close(SET);
}