New utility script to split STL plates into individual STL files

lib/Slic3r/STL.pm

@@ -83,4 +83,42 @@ sub _read_binary {
     }
 }
 
+sub write_file {
+    my $self = shift;
+    my ($file, $mesh, $binary) = @_;
+    
+    open my $fh, '>', $file;
+    
+    $binary
+        ? _write_binary($fh, $mesh->facets)
+        : _write_ascii($fh, $mesh->facets);
+    
+    close $fh;
+}
+
+sub _write_binary {
+    my ($fh, $facets) = @_;
+    
+    die "bigfloat" unless length(pack "f", 1) == 4;
+    
+    binmode $fh;
+    print $fh pack 'x80';
+    print $fh pack 'L', ($#$facets + 1);
+    print $fh pack '(f<3)4S', (map @$_, @$_), 0 for @$facets;
+}
+
+sub _write_ascii {
+    my ($fh, $facets) = @_;
+    
+    printf $fh "solid\n";
+    foreach my $facet (@$facets) {
+        printf $fh "   facet normal %f %f %f\n", @{$facet->[0]};
+        printf $fh "      outer loop\n";
+        printf $fh "         vertex %f %f %f\n", @$_ for @$facet[1,2,3];
+        printf $fh "      endloop\n";
+        printf $fh "   endfacet\n";
+    }
+    printf $fh "endsolid\n";
+}
+
 1;

lib/Slic3r/TriangleMesh.pm

@@ -457,4 +457,20 @@ sub edge_id {
     return join "-", sort @point_ids;
 }
 
+sub get_connected_facets {
+    my $self = shift;
+    my ($facet_id) = @_;
+    
+    my @facets = ();
+    foreach my $edge_facets (values %{$self->edge_facets}) {
+        if (grep $_ == $facet_id, @$edge_facets) {
+            # this edge belongs to the current facet, so let's get
+            # the other facet(s)
+            push @facets, grep $_ != $facet_id, @$edge_facets;
+        }
+    }
+    
+    return @facets;
+}
+
 1;

utils/split_stl.pl

@@ -0,0 +1,74 @@
+#!/usr/bin/perl
+# This script splits a STL plate into individual files
+
+use strict;
+use warnings;
+
+BEGIN {
+    use FindBin;
+    use lib "$FindBin::Bin/../lib";
+}
+
+use File::Basename qw(basename);
+use Getopt::Long qw(:config no_auto_abbrev);
+use Slic3r;
+$|++;
+
+my %opt = ();
+{
+    my %options = (
+        'help'                  => sub { usage() },
+        'ascii'                 => \$opt{ascii},
+    );
+    GetOptions(%options) or usage(1);
+    $ARGV[0] or usage(1);
+}
+
+{
+    my $mesh = Slic3r::STL->read_file($ARGV[0]);
+    my $basename = $ARGV[0];
+    $basename =~ s/\.stl$//i;
+    
+    # loop while we have remaining facets
+    my $part_count = 0;
+    $mesh->make_edge_table;
+    while (1) {
+        # get the first facet
+        my @facet_queue = ();
+        my @facets = ();
+        for (my $i = 0; $i <= $#{$mesh->facets}; $i++) {
+            if (defined $mesh->facets->[$i]) {
+                push @facet_queue, $i;
+                last;
+            }
+        }
+        last if !@facet_queue;
+        
+        while (defined (my $facet_id = shift @facet_queue)) {
+            next unless defined $mesh->facets->[$facet_id];
+            push @facets, $mesh->facets->[$facet_id];
+            push @facet_queue, $mesh->get_connected_facets($facet_id);
+            $mesh->facets->[$facet_id] = undef;
+        }
+        
+        my $output_file = sprintf '%s_%02d.stl', $basename, ++$part_count;
+        printf "Writing to %s\n", basename($output_file);
+        Slic3r::STL->write_file($output_file, Slic3r::TriangleMesh->new(facets => \@facets), !$opt{ascii});
+    }
+}
+
+
+sub usage {
+    my ($exit_code) = @_;
+    
+    print <<"EOF";
+Usage: split_stl.pl [ OPTIONS ] file.stl
+
+    --help              Output this usage screen and exit
+    --ascii             Generate ASCII STL files (default: binary)
+    
+EOF
+    exit ($exit_code || 0);
+}
+
+__END__