Parse and write multi-material AMF files. Convert multiple STL files into a single multi-material AMF

lib/Slic3r/AMF.pm

@@ -14,53 +14,75 @@ sub read_file {
     open my $fh, '<', $file or die "Failed to open $file\n";
     
     my $vertices = [];
-    my $facets = [];
+    my $materials = {};
+    my $meshes_by_material = {};
     XML::SAX::ExpatXS
         ->new(Handler => Slic3r::AMF::Parser->new(
-            _vertices    => $vertices,
-            _facets      => $facets,
+            _vertices           => $vertices,
+            _materials          => $materials,
+            _meshes_by_material => $meshes_by_material,
          ))
         ->parse_file($fh);
     
     close $fh;
     
-    return Slic3r::TriangleMesh->new(vertices => $vertices, facets => $facets);
+    $_ = Slic3r::TriangleMesh->new(vertices => $vertices, facets => $_)
+        for values %$meshes_by_material;
+    
+    return $materials, $meshes_by_material;
 }
 
 sub write_file {
     my $self = shift;
-    my ($file, $mesh) = @_;
+    my ($file, $materials, $meshes_by_material) = @_;
+    
+    my %vertices_offset = ();
     
     open my $fh, '>', $file;
     binmode $fh, ':utf8';
-    
     printf $fh qq{<?xml version="1.0" encoding="UTF-8"?>\n};
     printf $fh qq{<amf unit="millimeter">\n};
     printf $fh qq{  <metadata type="cad">Slic3r %s</metadata>\n}, $Slic3r::VERSION;
+    foreach my $material_id (keys %$materials) {
+        printf $fh qq{  <material id="%s">\n}, $material_id;
+        for (keys %{$materials->{$material_id}}) {
+             printf $fh qq{    <metadata type=\"%s\">%s</metadata>\n}, $_, $materials->{$material_id}{$_};
+        }
+        printf $fh qq{  </material>\n};
+    }
     printf $fh qq{  <object id="0">\n};
     printf $fh qq{    <mesh>\n};
     printf $fh qq{      <vertices>\n};
-    foreach my $vertex (@{$mesh->vertices}) {
-        printf $fh qq{        <vertex>\n};
-        printf $fh qq{          <coordinates>\n};
-        printf $fh qq{            <x>%s</x>\n}, $vertex->[X];
-        printf $fh qq{            <y>%s</y>\n}, $vertex->[Y];
-        printf $fh qq{            <z>%s</z>\n}, $vertex->[Z];
-        printf $fh qq{          </coordinates>\n};
-        printf $fh qq{        </vertex>\n};
+    my $vertices_count = 0;
+    foreach my $mesh (values %$meshes_by_material) {
+        $vertices_offset{$mesh} = $vertices_count;
+        foreach my $vertex (@{$mesh->vertices}, ) {
+            printf $fh qq{        <vertex>\n};
+            printf $fh qq{          <coordinates>\n};
+            printf $fh qq{            <x>%s</x>\n}, $vertex->[X];
+            printf $fh qq{            <y>%s</y>\n}, $vertex->[Y];
+            printf $fh qq{            <z>%s</z>\n}, $vertex->[Z];
+            printf $fh qq{          </coordinates>\n};
+            printf $fh qq{        </vertex>\n};
+            $vertices_count++;
+        }
     }
     printf $fh qq{      </vertices>\n};
-    printf $fh qq{      <volume>\n};
-    foreach my $facet (@{$mesh->facets}) {
-        printf $fh qq{        <triangle>\n};
-        printf $fh qq{          <v%d>%d</v%d>\n}, $_, $facet->[$_], $_ for 1..3;
-        printf $fh qq{        </triangle>\n};
+    foreach my $material_id (sort keys %$meshes_by_material) {
+        my $mesh = $meshes_by_material->{$material_id};
+        printf $fh qq{      <volume%s>\n},
+            ($material_id eq '_') ? '' : " materialid=\"$material_id\"";
+        foreach my $facet (@{$mesh->facets}) {
+            printf $fh qq{        <triangle>\n};
+            printf $fh qq{          <v%d>%d</v%d>\n}, $_, $facet->[$_] + $vertices_offset{$mesh}, $_
+                for 1..3;
+            printf $fh qq{        </triangle>\n};
+        }
+        printf $fh qq{      </volume>\n};
     }
-    printf $fh qq{      </volume>\n};
     printf $fh qq{    </mesh>\n};
     printf $fh qq{  </object>\n};
     printf $fh qq{</amf>\n};
-    
     close $fh;
 }
 

lib/Slic3r/AMF/Parser.pm

@@ -3,6 +3,8 @@ use strict;
 use warnings;
 
 use XML::SAX::ExpatXS;
+use XXX;
+
 use base 'XML::SAX::Base';
 
 my %xyz_index = (x => 0, y => 1, z => 2); #=
@@ -21,10 +23,19 @@ sub start_element {
         $self->{_vertex} = ["", "", ""];
     } elsif ($self->{_vertex} && $data->{LocalName} =~ /^[xyz]$/ && $self->{_tree}[-1] eq 'coordinates') {
         $self->{_coordinate} = $data->{LocalName};
+    } elsif ($data->{LocalName} eq 'volume') {
+        $self->{_volume_materialid} = $self->_get_attribute($data, 'materialid');
+        $self->{_volume} = [];
     } elsif ($data->{LocalName} eq 'triangle') {
         $self->{_triangle} = [[], "", "", ""];  # empty normal
     } elsif ($self->{_triangle} && $data->{LocalName} =~ /^v([123])$/ && $self->{_tree}[-1] eq 'triangle') {
         $self->{_vertex_idx} = $1;
+    } elsif ($data->{LocalName} eq 'material') {
+        $self->{_material_id} = $self->_get_attribute($data, 'id') || '_';
+        $self->{_material} = {};
+    } elsif ($data->{LocalName} eq 'metadata' && $self->{_tree}[-1] eq 'material') {
+        $self->{_material_metadata_type} = $self->_get_attribute($data, 'type');
+        $self->{_material}{ $self->{_material_metadata_type} } = "";
     }
     
     push @{$self->{_tree}}, $data->{LocalName};
@@ -38,6 +49,8 @@ sub characters {
         $self->{_vertex}[ $xyz_index{$self->{_coordinate}} ] .= $data->{Data};
     } elsif ($self->{_triangle} && defined $self->{_vertex_idx}) {
         $self->{_triangle}[ $self->{_vertex_idx} ] .= $data->{Data};
+    } elsif ($self->{_material_metadata_type}) {
+        $self->{_material}{ $self->{_material_metadata_type} } .= $data->{Data};
     }
 }
 
@@ -52,13 +65,29 @@ sub end_element {
         $self->{_vertex} = undef;
     } elsif ($self->{_coordinate} && $data->{LocalName} =~ /^[xyz]$/) {
         $self->{_coordinate} = undef;
+    } elsif ($data->{LocalName} eq 'volume') {
+        $self->{_meshes_by_material}{ $self->{_volume_materialid} } ||= [];
+        push @{ $self->{_meshes_by_material}{ $self->{_volume_materialid} } }, @{$self->{_volume}};
+        $self->{_volume} = undef;
     } elsif ($data->{LocalName} eq 'triangle') {
-        push @{$self->{_facets}}, $self->{_triangle};
+        push @{$self->{_volume}}, $self->{_triangle};
         $self->{_triangle} = undef;
     } elsif ($self->{_vertex_idx} && $data->{LocalName} =~ /^v[123]$/) {
         $self->{_vertex_idx} = undef;
+    } elsif ($data->{LocalName} eq 'material') {
+        $self->{_materials}{ $self->{_material_id} } = $self->{_material};
+        $self->{_material_id} = undef;
+        $self->{_material} = undef;
+    } elsif ($data->{LocalName} eq 'metadata' && $self->{_material}) {
+        $self->{_material_metadata_type} = undef;
     }
+}
+
+sub _get_attribute {
+    my $self = shift;
+    my ($data, $name) = @_;
     
+    return +(map $_->{Value}, grep $_->{Name} eq $name, values %{$data->{Attributes}})[0];
 }
 
 1;

lib/Slic3r/STL.pm

@@ -126,7 +126,7 @@ sub _read_ascii {
     
     my $facet;
     seek $fh, 0, 0;
-    while (<$fh>) {
+    while (my $_ = <$fh>) {
         s/\R+$//;
         if (!$facet) {
             /^\s*facet\s+normal\s+$point_re/ or next;
@@ -153,7 +153,7 @@ sub _read_binary {
     
     binmode $fh;
     seek $fh, 80 + 4, 0;
-    while (read $fh, $_, 4*4*3+2) {
+    while (read $fh, my $_, 4*4*3+2) {
         my @v = unpack '(f<3)4';
         push @$facets, [ [@v[0..2]], [@v[3..5]], [@v[6..8]], [@v[9..11]] ];
     }

lib/Slic3r/Skein.pm

@@ -25,14 +25,16 @@ sub go {
     # each layer has surfaces with holes
     $self->status_cb->(10, "Processing triangulated mesh");
     my $print;
-    {
-        my $mesh = $self->input_file =~ /\.stl$/i
-            ? Slic3r::STL->read_file($self->input_file)
-            : $self->input_file =~ /\.amf(\.xml)?$/i
-                ? Slic3r::AMF->read_file($self->input_file)
-                : die "Input file must have .stl or .amf(.xml) extension\n";
+    if ($self->input_file =~ /\.stl$/i) {
+        my $mesh = Slic3r::STL->read_file($self->input_file);
         $mesh->check_manifoldness;
         $print = Slic3r::Print->new_from_mesh($mesh);
+    } elsif ( $self->input_file =~ /\.amf(\.xml)?$/i) {
+        my ($materials, $meshes_by_material) = Slic3r::AMF->read_file($self->input_file);
+        $_->check_manifoldness for values %$meshes_by_material;
+        $print = Slic3r::Print->new_from_mesh($meshes_by_material->{_} || +(values %$meshes_by_material)[0]);
+    } else {
+        die "Input file must have .stl or .amf(.xml) extension\n";
     }
     
     # make perimeters

utils/stl-to-amf.pl

@@ -24,12 +24,23 @@ my %opt = ();
 }
 
 {
-    my $mesh = Slic3r::STL->read_file($ARGV[0]);
+    my @meshes = map Slic3r::STL->read_file($_), @ARGV;
     my $output_file = $ARGV[0];
     $output_file =~ s/\.stl$/.amf.xml/i;
     
+    my $materials = {};
+    my $meshes_by_material = {};
+    if (@meshes == 1) {
+        $meshes_by_material->{_} = $meshes[0];
+    } else {
+        for (0..$#meshes) {
+            $materials->{$_+1} = { Name => basename($ARGV[$_]) };
+            $meshes_by_material->{$_+1} = $meshes[$_];
+        }
+    }
+    
     printf "Writing to %s\n", basename($output_file);
-    Slic3r::AMF->write_file($output_file, $mesh);
+    Slic3r::AMF->write_file($output_file, $materials, $meshes_by_material);
 }
 
 
@@ -37,7 +48,7 @@ sub usage {
     my ($exit_code) = @_;
     
     print <<"EOF";
-Usage: amf-to-stl.pl [ OPTIONS ] file.stl
+Usage: amf-to-stl.pl [ OPTIONS ] file.stl [ file2.stl [ file3.stl ] ]
 
     --help              Output this usage screen and exit