From 02de08e04b38f1e8607038dc5fa464f99bfe7a78 Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Mon, 19 Feb 2024 23:38:17 +0000
Subject: [PATCH 01/23] add outline test for 3mf export

---
 test/exporters/test_3mf_exporter.rb | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 test/exporters/test_3mf_exporter.rb

diff --git a/test/exporters/test_3mf_exporter.rb b/test/exporters/test_3mf_exporter.rb
new file mode 100644
index 0000000..f2b4753
--- /dev/null
+++ b/test/exporters/test_3mf_exporter.rb
@@ -0,0 +1,20 @@
+require 'minitest_helper'
+
+class Test3MFExporter < Minitest::Test
+  def test_3mf_container
+    # Create a test object
+    box = Mittsu::Mesh.new(
+      Mittsu::BoxGeometry.new(1.0, 1.0, 1.0)
+    )
+    obj = Mittsu::Object3D.new
+    obj.add(box)
+    group = Mittsu::Group.new
+    group.add obj
+
+    # Export to 3MF
+    exporter = Mittsu::ThreeMFExporter.new
+    file = exporter.parse(group)
+
+    assert_equal file, 42
+  end
+end

From fba5abc8a7e0d5dc47bf80d0fbbe5a5ed127aa61 Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Mon, 19 Feb 2024 23:42:08 +0000
Subject: [PATCH 02/23] add 3mf exporter class skeleton

---
 lib/mittsu.rb                        |  1 +
 lib/mittsu/exporters.rb              |  1 +
 lib/mittsu/exporters/3mf_exporter.rb | 10 ++++++++++
 3 files changed, 12 insertions(+)
 create mode 100644 lib/mittsu/exporters.rb
 create mode 100644 lib/mittsu/exporters/3mf_exporter.rb

diff --git a/lib/mittsu.rb b/lib/mittsu.rb
index 71022d0..2c54979 100644
--- a/lib/mittsu.rb
+++ b/lib/mittsu.rb
@@ -12,3 +12,4 @@
 require "mittsu/scenes"
 require "mittsu/textures"
 require "mittsu/constants"
+require "mittsu/exporters"
diff --git a/lib/mittsu/exporters.rb b/lib/mittsu/exporters.rb
new file mode 100644
index 0000000..e0e834d
--- /dev/null
+++ b/lib/mittsu/exporters.rb
@@ -0,0 +1 @@
+require 'mittsu/exporters/3mf_exporter'
diff --git a/lib/mittsu/exporters/3mf_exporter.rb b/lib/mittsu/exporters/3mf_exporter.rb
new file mode 100644
index 0000000..06ce643
--- /dev/null
+++ b/lib/mittsu/exporters/3mf_exporter.rb
@@ -0,0 +1,10 @@
+module Mittsu
+  class ThreeMFExporter
+    def initialize(options = {})
+    end
+
+    def parse(scene)
+      "ceci n'est pas une 3mf"
+    end
+  end
+end

From 560a171b4679c02eef97eb57eb4d5c4795035270 Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Wed, 21 Feb 2024 12:35:14 +0000
Subject: [PATCH 03/23] rename parse to export, and add alias for compatibility

---
 lib/mittsu/exporters/3mf_exporter.rb | 6 +++++-
 test/exporters/test_3mf_exporter.rb  | 8 +++++++-
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/lib/mittsu/exporters/3mf_exporter.rb b/lib/mittsu/exporters/3mf_exporter.rb
index 06ce643..c3d4069 100644
--- a/lib/mittsu/exporters/3mf_exporter.rb
+++ b/lib/mittsu/exporters/3mf_exporter.rb
@@ -3,8 +3,12 @@ class ThreeMFExporter
     def initialize(options = {})
     end
 
-    def parse(scene)
+    def export(object)
       "ceci n'est pas une 3mf"
     end
+
+    # Parse is here for consistency with THREE.js's weird naming of exporter methods
+    alias_method :parse, :export
+
   end
 end
diff --git a/test/exporters/test_3mf_exporter.rb b/test/exporters/test_3mf_exporter.rb
index f2b4753..574c226 100644
--- a/test/exporters/test_3mf_exporter.rb
+++ b/test/exporters/test_3mf_exporter.rb
@@ -13,8 +13,14 @@ def test_3mf_container
 
     # Export to 3MF
     exporter = Mittsu::ThreeMFExporter.new
-    file = exporter.parse(group)
+    file = exporter.export(group)
 
     assert_equal file, 42
   end
+
+  def test_export_method_alias
+    exporter = Mittsu::ThreeMFExporter.new
+    result = exporter.parse(Mittsu::Group.new())
+    assert_kind_of(String, result)
+  end
 end

From 73f003a933a511e02ef14e90b910efdc65e4e512 Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Wed, 21 Feb 2024 12:36:47 +0000
Subject: [PATCH 04/23] add #export_uncompressed for easier testing of 3MF
 content

---
 lib/mittsu/exporters/3mf_exporter.rb | 7 ++++++-
 test/exporters/test_3mf_exporter.rb  | 4 ++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/lib/mittsu/exporters/3mf_exporter.rb b/lib/mittsu/exporters/3mf_exporter.rb
index c3d4069..4998b0b 100644
--- a/lib/mittsu/exporters/3mf_exporter.rb
+++ b/lib/mittsu/exporters/3mf_exporter.rb
@@ -4,11 +4,16 @@ def initialize(options = {})
     end
 
     def export(object)
-      "ceci n'est pas une 3mf"
+      export_uncompressed(object)
     end
 
     # Parse is here for consistency with THREE.js's weird naming of exporter methods
     alias_method :parse, :export
 
+    private
+
+    def export_uncompressed(object)
+      "ceci n'est pas une 3mf"
+    end
   end
 end
diff --git a/test/exporters/test_3mf_exporter.rb b/test/exporters/test_3mf_exporter.rb
index 574c226..ed689a5 100644
--- a/test/exporters/test_3mf_exporter.rb
+++ b/test/exporters/test_3mf_exporter.rb
@@ -1,7 +1,7 @@
 require 'minitest_helper'
 
 class Test3MFExporter < Minitest::Test
-  def test_3mf_container
+  def test_3mf_content
     # Create a test object
     box = Mittsu::Mesh.new(
       Mittsu::BoxGeometry.new(1.0, 1.0, 1.0)
@@ -13,7 +13,7 @@ def test_3mf_container
 
     # Export to 3MF
     exporter = Mittsu::ThreeMFExporter.new
-    file = exporter.export(group)
+    file = exporter.send(:export_uncompressed, group)
 
     assert_equal file, 42
   end

From 4057766a87c8d182ea7ed527fd1f5d4cd0516fb4 Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Wed, 21 Feb 2024 12:37:20 +0000
Subject: [PATCH 05/23] remove extraneous Object3D and Group in export test

---
 test/exporters/test_3mf_exporter.rb | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/test/exporters/test_3mf_exporter.rb b/test/exporters/test_3mf_exporter.rb
index ed689a5..c830e06 100644
--- a/test/exporters/test_3mf_exporter.rb
+++ b/test/exporters/test_3mf_exporter.rb
@@ -6,14 +6,10 @@ def test_3mf_content
     box = Mittsu::Mesh.new(
       Mittsu::BoxGeometry.new(1.0, 1.0, 1.0)
     )
-    obj = Mittsu::Object3D.new
-    obj.add(box)
-    group = Mittsu::Group.new
-    group.add obj
 
     # Export to 3MF
     exporter = Mittsu::ThreeMFExporter.new
-    file = exporter.send(:export_uncompressed, group)
+    file = exporter.send(:export_uncompressed, box)
 
     assert_equal file, 42
   end

From d8e3a899cb6801ad7db21230ec0b7ab671b0433f Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Wed, 21 Feb 2024 13:19:58 +0000
Subject: [PATCH 06/23] 3MF: skeleton model file export

---
 lib/mittsu/exporters/3mf_exporter.rb | 15 ++++++++++++---
 test/exporters/test_3mf_exporter.rb  | 25 ++++++++++++++-----------
 2 files changed, 26 insertions(+), 14 deletions(-)

diff --git a/lib/mittsu/exporters/3mf_exporter.rb b/lib/mittsu/exporters/3mf_exporter.rb
index 4998b0b..0617249 100644
--- a/lib/mittsu/exporters/3mf_exporter.rb
+++ b/lib/mittsu/exporters/3mf_exporter.rb
@@ -4,7 +4,10 @@ def initialize(options = {})
     end
 
     def export(object)
-      export_uncompressed(object)
+      Dir.mktmpdir do |dir|
+        export_uncompressed(dir, object)
+        # TODO compress into single file
+      end
     end
 
     # Parse is here for consistency with THREE.js's weird naming of exporter methods
@@ -12,8 +15,14 @@ def export(object)
 
     private
 
-    def export_uncompressed(object)
-      "ceci n'est pas une 3mf"
+    def export_uncompressed(dir, object)
+      FileUtils.mkdir_p File.join(dir, "3D")
+      export_3d_model_part(dir, object)
+    end
+
+    def export_3d_model_part(dir, object)
+      filename = File.join(dir, "3D/#{object.name || SecureRandom.uuid}.model")
+      File.write(filename, "ceci n'est pas une 3mf")
     end
   end
 end
diff --git a/test/exporters/test_3mf_exporter.rb b/test/exporters/test_3mf_exporter.rb
index c830e06..333a5dc 100644
--- a/test/exporters/test_3mf_exporter.rb
+++ b/test/exporters/test_3mf_exporter.rb
@@ -1,22 +1,25 @@
 require 'minitest_helper'
 
 class Test3MFExporter < Minitest::Test
-  def test_3mf_content
-    # Create a test object
-    box = Mittsu::Mesh.new(
+  def setup
+    @tmpdir = Dir.mktmpdir
+    @box = Mittsu::Mesh.new(
       Mittsu::BoxGeometry.new(1.0, 1.0, 1.0)
     )
+    @box.name = "box"
+    @exporter = Mittsu::ThreeMFExporter.new
+  end
 
-    # Export to 3MF
-    exporter = Mittsu::ThreeMFExporter.new
-    file = exporter.send(:export_uncompressed, box)
-
-    assert_equal file, 42
+  def test_3mf_exports_3d_model_part
+    @exporter.send(:export_uncompressed, @tmpdir, @box)
+    assert File.exist?(File.join(@tmpdir, "3D/box.model"))
   end
 
   def test_export_method_alias
-    exporter = Mittsu::ThreeMFExporter.new
-    result = exporter.parse(Mittsu::Group.new())
-    assert_kind_of(String, result)
+    assert @exporter.parse(Mittsu::Group.new())
+  end
+
+  def teardown
+    FileUtils.remove_entry @tmpdir
   end
 end

From c03a1ebfd02581d073d32785df0fa887a49abc5d Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Wed, 21 Feb 2024 14:41:16 +0000
Subject: [PATCH 07/23] add builder as direct dependency for writing XML files

it's already an indirect dependency because of minitest, so this seemed the neatest thing to use
---
 mittsu.gemspec | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mittsu.gemspec b/mittsu.gemspec
index ea66e7b..37a11cf 100644
--- a/mittsu.gemspec
+++ b/mittsu.gemspec
@@ -26,6 +26,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency 'opengl-bindings'
   spec.add_runtime_dependency 'ffi'
   spec.add_runtime_dependency 'chunky_png'
+  spec.add_runtime_dependency 'builder'
 
   spec.add_development_dependency "bundler"
   spec.add_development_dependency "rake"

From 16b4f673aeb93e29c05948d13f0514556584d3ef Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Wed, 21 Feb 2024 14:41:41 +0000
Subject: [PATCH 08/23] test building an outline XML model for 3mf

---
 lib/mittsu/exporters/3mf_exporter.rb | 10 +++++++++-
 test/exporters/test_3mf_exporter.rb  |  6 +++++-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/lib/mittsu/exporters/3mf_exporter.rb b/lib/mittsu/exporters/3mf_exporter.rb
index 0617249..74615b1 100644
--- a/lib/mittsu/exporters/3mf_exporter.rb
+++ b/lib/mittsu/exporters/3mf_exporter.rb
@@ -1,3 +1,5 @@
+require 'builder'
+
 module Mittsu
   class ThreeMFExporter
     def initialize(options = {})
@@ -22,7 +24,13 @@ def export_uncompressed(dir, object)
 
     def export_3d_model_part(dir, object)
       filename = File.join(dir, "3D/#{object.name || SecureRandom.uuid}.model")
-      File.write(filename, "ceci n'est pas une 3mf")
+      File.open(filename, "wb") do |file|
+        xml = Builder::XmlMarkup.new(target: file, indent: 2)
+        xml.instruct! :xml, encoding: "UTF-8"
+        xml.model unit: "millimeter", "xml:lang": "en-US", xmlns:"http://schemas.microsoft.com/3dmanufacturing/core/2015/02" do
+
+        end
+      end
     end
   end
 end
diff --git a/test/exporters/test_3mf_exporter.rb b/test/exporters/test_3mf_exporter.rb
index 333a5dc..964a687 100644
--- a/test/exporters/test_3mf_exporter.rb
+++ b/test/exporters/test_3mf_exporter.rb
@@ -1,4 +1,6 @@
 require 'minitest_helper'
+require 'rexml/document'
+require 'rexml/xpath'
 
 class Test3MFExporter < Minitest::Test
   def setup
@@ -12,9 +14,11 @@ def setup
 
   def test_3mf_exports_3d_model_part
     @exporter.send(:export_uncompressed, @tmpdir, @box)
-    assert File.exist?(File.join(@tmpdir, "3D/box.model"))
+    REXML::Document.new File.read(File.join(@tmpdir, "3D/box.model"))
+    assert_equal "millimeter", REXML::XPath.first(xml, "/model/@unit").value
   end
 
+
   def test_export_method_alias
     assert @exporter.parse(Mittsu::Group.new())
   end

From abcd9891574963a1cc4600e8d8e749e592881c93 Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Thu, 22 Feb 2024 15:15:11 +0000
Subject: [PATCH 09/23] create 3MF OPC package metadata files

---
 lib/mittsu/exporters/3mf_exporter.rb | 38 +++++++++++++++++++++++++---
 test/exporters/test_3mf_exporter.rb  | 12 +++++++++
 2 files changed, 46 insertions(+), 4 deletions(-)

diff --git a/lib/mittsu/exporters/3mf_exporter.rb b/lib/mittsu/exporters/3mf_exporter.rb
index 74615b1..d5dad4b 100644
--- a/lib/mittsu/exporters/3mf_exporter.rb
+++ b/lib/mittsu/exporters/3mf_exporter.rb
@@ -18,19 +18,49 @@ def export(object)
     private
 
     def export_uncompressed(dir, object)
-      FileUtils.mkdir_p File.join(dir, "3D")
-      export_3d_model_part(dir, object)
+      export_content_types(dir)
+      filename = export_3d_model_part(dir, object)
+      export_rels(dir, [filename])
     end
 
-    def export_3d_model_part(dir, object)
-      filename = File.join(dir, "3D/#{object.name || SecureRandom.uuid}.model")
+    def export_content_types(dir)
+      filename = File.join(dir, "[Content_Types].xml")
+      File.open(filename, "wb") do |file|
+        xml = Builder::XmlMarkup.new(target: file, indent: 2)
+        xml.instruct! :xml, encoding: "UTF-8"
+        xml.Types xmlns: "http://schemas.openxmlformats.org/package/2006/content-types" do
+          xml.Default Extension: "rels", ContentType: "application/vnd.openxmlformats-package.relationships+xml"
+          xml.Default Extension: "model", ContentType: "application/vnd.ms-package.3dmanufacturing-3dmodel+xml"
+        end
+      end
+    end
+
+    def export_rels(dir, models)
+      FileUtils.mkdir_p File.join(dir, "_rels")
+      filename = File.join(dir, "_rels/.rels")
       File.open(filename, "wb") do |file|
+        xml = Builder::XmlMarkup.new(target: file, indent: 2)
+        xml.instruct! :xml, encoding: "UTF-8"
+        xml.Relationships xmlns: "http://schemas.openxmlformats.org/package/2006/relationships" do
+          models.each do |name|
+            xml.Relationship Target: "/3D/#{name}.model", Id: name, ContentType: "http://schemas.microsoft.com/3dmanufacturing/2013/01/3dmodel"
+          end
+        end
+      end
+    end
+
+    def export_3d_model_part(dir, object)
+      FileUtils.mkdir_p File.join(dir, "3D")
+      filename = object.name.parameterize || SecureRandom.uuid
+      pathname = File.join(dir, "3D/#{filename}.model")
+      File.open(pathname, "wb") do |file|
         xml = Builder::XmlMarkup.new(target: file, indent: 2)
         xml.instruct! :xml, encoding: "UTF-8"
         xml.model unit: "millimeter", "xml:lang": "en-US", xmlns:"http://schemas.microsoft.com/3dmanufacturing/core/2015/02" do
 
         end
       end
+      filename
     end
   end
 end
diff --git a/test/exporters/test_3mf_exporter.rb b/test/exporters/test_3mf_exporter.rb
index 964a687..ef164a7 100644
--- a/test/exporters/test_3mf_exporter.rb
+++ b/test/exporters/test_3mf_exporter.rb
@@ -16,8 +16,20 @@ def test_3mf_exports_3d_model_part
     @exporter.send(:export_uncompressed, @tmpdir, @box)
     REXML::Document.new File.read(File.join(@tmpdir, "3D/box.model"))
     assert_equal "millimeter", REXML::XPath.first(xml, "/model/@unit").value
+
+  def test_3mf_exports_content_types
+    @exporter.send(:export_uncompressed, @tmpdir, @box)
+    xml = REXML::Document.new File.read(File.join(@tmpdir, "[Content_Types].xml"))
+    assert_equal "application/vnd.openxmlformats-package.relationships+xml",
+      REXML::XPath.first(xml, "/Types/Default[@Extension='rels']/@ContentType").value
   end
 
+  def test_3mf_exports_rels
+    @exporter.send(:export_uncompressed, @tmpdir, @box)
+    xml = REXML::Document.new File.read(File.join(@tmpdir, "_rels/.rels"))
+    assert_equal "/3D/box.model",
+      REXML::XPath.first(xml, "/Relationships/Relationship/@Target").value
+  end
 
   def test_export_method_alias
     assert @exporter.parse(Mittsu::Group.new())

From e44571f53c8edd5ab99348ed909983b9fb3d2f20 Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Thu, 22 Feb 2024 15:15:44 +0000
Subject: [PATCH 10/23] store actual mesh data in 3MF

---
 lib/mittsu/exporters/3mf_exporter.rb | 25 ++++++++++++++++++++++++-
 test/exporters/test_3mf_exporter.rb  |  6 ++++--
 2 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/lib/mittsu/exporters/3mf_exporter.rb b/lib/mittsu/exporters/3mf_exporter.rb
index d5dad4b..6fc05a5 100644
--- a/lib/mittsu/exporters/3mf_exporter.rb
+++ b/lib/mittsu/exporters/3mf_exporter.rb
@@ -57,7 +57,30 @@ def export_3d_model_part(dir, object)
         xml = Builder::XmlMarkup.new(target: file, indent: 2)
         xml.instruct! :xml, encoding: "UTF-8"
         xml.model unit: "millimeter", "xml:lang": "en-US", xmlns:"http://schemas.microsoft.com/3dmanufacturing/core/2015/02" do
-
+          objectIDs = []
+          xml.resources do
+            uuid = SecureRandom.uuid
+            objectIDs << uuid
+            xml.object id: uuid, type: "model" do
+              xml.mesh do
+                xml.vertices do
+                  object.geometry.vertices.each do |vertex|
+                    xml.vertex x: vertex.x, y: vertex.y, z: vertex.z
+                  end
+                end
+                xml.triangles do
+                  object.geometry.faces.each do |face|
+                    xml.triangle v1: face.a, v2: face.b, v3: face.c
+                  end
+                end
+              end
+            end
+          end
+          xml.build do
+            objectIDs.each do |id|
+              xml.item objectid: id
+            end
+          end
         end
       end
       filename
diff --git a/test/exporters/test_3mf_exporter.rb b/test/exporters/test_3mf_exporter.rb
index ef164a7..345b0da 100644
--- a/test/exporters/test_3mf_exporter.rb
+++ b/test/exporters/test_3mf_exporter.rb
@@ -14,8 +14,10 @@ def setup
 
   def test_3mf_exports_3d_model_part
     @exporter.send(:export_uncompressed, @tmpdir, @box)
-    REXML::Document.new File.read(File.join(@tmpdir, "3D/box.model"))
+    xml = REXML::Document.new File.read(File.join(@tmpdir, "3D/box.model"))
     assert_equal "millimeter", REXML::XPath.first(xml, "/model/@unit").value
+    assert_equal "model", REXML::XPath.first(xml, "/model/resources/object/@type").value
+  end
 
   def test_3mf_exports_content_types
     @exporter.send(:export_uncompressed, @tmpdir, @box)
@@ -32,7 +34,7 @@ def test_3mf_exports_rels
   end
 
   def test_export_method_alias
-    assert @exporter.parse(Mittsu::Group.new())
+    assert @exporter.parse(@box)
   end
 
   def teardown

From e876535b29bc72cfb87037fc2740218f247dd96a Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Fri, 23 Feb 2024 10:34:47 +0000
Subject: [PATCH 11/23] add zip compression for 3mf output

---
 lib/mittsu/exporters/3mf_exporter.rb | 9 +++++++--
 mittsu.gemspec                       | 1 +
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/lib/mittsu/exporters/3mf_exporter.rb b/lib/mittsu/exporters/3mf_exporter.rb
index 6fc05a5..ad9d2ee 100644
--- a/lib/mittsu/exporters/3mf_exporter.rb
+++ b/lib/mittsu/exporters/3mf_exporter.rb
@@ -1,4 +1,5 @@
 require 'builder'
+require 'zip/filesystem'
 
 module Mittsu
   class ThreeMFExporter
@@ -7,9 +8,13 @@ def initialize(options = {})
 
     def export(object)
       Dir.mktmpdir do |dir|
-        export_uncompressed(dir, object)
-        # TODO compress into single file
+        Zip::File.open("output.3mf", Zip::File::CREATE) do |zip|
+          Dir.glob("**/*", File::FNM_DOTMATCH, base: dir) do |f|
+            zip.add(f, File.join(dir, f))
+          end
+        end
       end
+      true
     end
 
     # Parse is here for consistency with THREE.js's weird naming of exporter methods
diff --git a/mittsu.gemspec b/mittsu.gemspec
index 37a11cf..645b9df 100644
--- a/mittsu.gemspec
+++ b/mittsu.gemspec
@@ -27,6 +27,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency 'ffi'
   spec.add_runtime_dependency 'chunky_png'
   spec.add_runtime_dependency 'builder'
+  spec.add_runtime_dependency 'rubyzip'
 
   spec.add_development_dependency "bundler"
   spec.add_development_dependency "rake"

From 6fe4fc78c22bac1c974a914495a551043f51a4ed Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Fri, 23 Feb 2024 14:19:25 +0000
Subject: [PATCH 12/23] test vertex/face output in 3MF model file

---
 test/exporters/test_3mf_exporter.rb | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/test/exporters/test_3mf_exporter.rb b/test/exporters/test_3mf_exporter.rb
index 345b0da..7f2877d 100644
--- a/test/exporters/test_3mf_exporter.rb
+++ b/test/exporters/test_3mf_exporter.rb
@@ -17,11 +17,8 @@ def test_3mf_exports_3d_model_part
     xml = REXML::Document.new File.read(File.join(@tmpdir, "3D/box.model"))
     assert_equal "millimeter", REXML::XPath.first(xml, "/model/@unit").value
     assert_equal "model", REXML::XPath.first(xml, "/model/resources/object/@type").value
-  end
-
-  def test_3mf_exports_content_types
-    @exporter.send(:export_uncompressed, @tmpdir, @box)
-    xml = REXML::Document.new File.read(File.join(@tmpdir, "[Content_Types].xml"))
+    assert_equal 8, REXML::XPath.match(xml, "/model/resources/object/mesh/vertices/vertex").count
+    assert_equal 12, REXML::XPath.match(xml, "/model/resources/object/mesh/triangles/triangle").count
     assert_equal "application/vnd.openxmlformats-package.relationships+xml",
       REXML::XPath.first(xml, "/Types/Default[@Extension='rels']/@ContentType").value
   end

From d81f515706369a9de263b63cf0381bb46f9278c3 Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Fri, 23 Feb 2024 14:20:31 +0000
Subject: [PATCH 13/23] refactor 3mf creation to require fewer temporary files
 on disk

---
 lib/mittsu/exporters/3mf_exporter.rb | 62 +++++++++++++++-------------
 test/exporters/test_3mf_exporter.rb  | 17 +++++---
 2 files changed, 44 insertions(+), 35 deletions(-)

diff --git a/lib/mittsu/exporters/3mf_exporter.rb b/lib/mittsu/exporters/3mf_exporter.rb
index ad9d2ee..9a9d1ed 100644
--- a/lib/mittsu/exporters/3mf_exporter.rb
+++ b/lib/mittsu/exporters/3mf_exporter.rb
@@ -6,13 +6,24 @@ class ThreeMFExporter
     def initialize(options = {})
     end
 
-    def export(object)
-      Dir.mktmpdir do |dir|
-        Zip::File.open("output.3mf", Zip::File::CREATE) do |zip|
-          Dir.glob("**/*", File::FNM_DOTMATCH, base: dir) do |f|
-            zip.add(f, File.join(dir, f))
-          end
+    def export(object, filename)
+      Zip::OutputStream.open(filename) do |zip|
+        # OPC content types file
+        store(zip, "[Content_Types].xml", content_types_file)
+        # Add models
+        models = [object]
+        model_names = models.map do |model|
+          # Set a model name if there isn't one
+          model.name ||= SecureRandom.uuid
+          # Make model name filesystem-safe
+          name = model.name.parameterize
+          # Store model
+          store(zip, "3D/#{name}.model", model_file(model))
+          # Remember the name for later
+          name
         end
+        # Add OPC rels file with list of contained models
+        store(zip, "_rels/.rels", rels_file(model_names))
       end
       true
     end
@@ -22,17 +33,20 @@ def export(object)
 
     private
 
-    def export_uncompressed(dir, object)
-      export_content_types(dir)
-      filename = export_3d_model_part(dir, object)
-      export_rels(dir, [filename])
+    def store(zip, filename, data)
+      zip.put_next_entry(filename)
+      zip.write(data)
+    end
+
+    def build &block
+      xml = Builder::XmlMarkup.new
+      xml.instruct! :xml, encoding: "UTF-8"
+      yield xml
+      xml.target!
     end
 
-    def export_content_types(dir)
-      filename = File.join(dir, "[Content_Types].xml")
-      File.open(filename, "wb") do |file|
-        xml = Builder::XmlMarkup.new(target: file, indent: 2)
-        xml.instruct! :xml, encoding: "UTF-8"
+    def content_types_file
+      build do |xml|
         xml.Types xmlns: "http://schemas.openxmlformats.org/package/2006/content-types" do
           xml.Default Extension: "rels", ContentType: "application/vnd.openxmlformats-package.relationships+xml"
           xml.Default Extension: "model", ContentType: "application/vnd.ms-package.3dmanufacturing-3dmodel+xml"
@@ -40,12 +54,8 @@ def export_content_types(dir)
       end
     end
 
-    def export_rels(dir, models)
-      FileUtils.mkdir_p File.join(dir, "_rels")
-      filename = File.join(dir, "_rels/.rels")
-      File.open(filename, "wb") do |file|
-        xml = Builder::XmlMarkup.new(target: file, indent: 2)
-        xml.instruct! :xml, encoding: "UTF-8"
+    def rels_file(models)
+      build do |xml|
         xml.Relationships xmlns: "http://schemas.openxmlformats.org/package/2006/relationships" do
           models.each do |name|
             xml.Relationship Target: "/3D/#{name}.model", Id: name, ContentType: "http://schemas.microsoft.com/3dmanufacturing/2013/01/3dmodel"
@@ -54,13 +64,8 @@ def export_rels(dir, models)
       end
     end
 
-    def export_3d_model_part(dir, object)
-      FileUtils.mkdir_p File.join(dir, "3D")
-      filename = object.name.parameterize || SecureRandom.uuid
-      pathname = File.join(dir, "3D/#{filename}.model")
-      File.open(pathname, "wb") do |file|
-        xml = Builder::XmlMarkup.new(target: file, indent: 2)
-        xml.instruct! :xml, encoding: "UTF-8"
+    def model_file(object)
+      build do |xml|
         xml.model unit: "millimeter", "xml:lang": "en-US", xmlns:"http://schemas.microsoft.com/3dmanufacturing/core/2015/02" do
           objectIDs = []
           xml.resources do
@@ -88,7 +93,6 @@ def export_3d_model_part(dir, object)
           end
         end
       end
-      filename
     end
   end
 end
diff --git a/test/exporters/test_3mf_exporter.rb b/test/exporters/test_3mf_exporter.rb
index 7f2877d..58e1755 100644
--- a/test/exporters/test_3mf_exporter.rb
+++ b/test/exporters/test_3mf_exporter.rb
@@ -12,20 +12,25 @@ def setup
     @exporter = Mittsu::ThreeMFExporter.new
   end
 
-  def test_3mf_exports_3d_model_part
-    @exporter.send(:export_uncompressed, @tmpdir, @box)
-    xml = REXML::Document.new File.read(File.join(@tmpdir, "3D/box.model"))
+  def test_3mf_model_file
+    file = @exporter.send(:model_file, @box)
+    xml = REXML::Document.new file
     assert_equal "millimeter", REXML::XPath.first(xml, "/model/@unit").value
     assert_equal "model", REXML::XPath.first(xml, "/model/resources/object/@type").value
     assert_equal 8, REXML::XPath.match(xml, "/model/resources/object/mesh/vertices/vertex").count
     assert_equal 12, REXML::XPath.match(xml, "/model/resources/object/mesh/triangles/triangle").count
+  end
+
+  def test_content_types_file
+    file = @exporter.send(:content_types_file)
+    xml = REXML::Document.new file
     assert_equal "application/vnd.openxmlformats-package.relationships+xml",
       REXML::XPath.first(xml, "/Types/Default[@Extension='rels']/@ContentType").value
   end
 
-  def test_3mf_exports_rels
-    @exporter.send(:export_uncompressed, @tmpdir, @box)
-    xml = REXML::Document.new File.read(File.join(@tmpdir, "_rels/.rels"))
+  def test_rels_file
+    file = @exporter.send(:rels_file, ["box"])
+    xml = REXML::Document.new file
     assert_equal "/3D/box.model",
       REXML::XPath.first(xml, "/Relationships/Relationship/@Target").value
   end

From 3ce76049a253074f996eecadb5bb713ee80bbfbd Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Fri, 23 Feb 2024 14:21:52 +0000
Subject: [PATCH 14/23] remove temp directory from 3mf tests

---
 test/exporters/test_3mf_exporter.rb | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/test/exporters/test_3mf_exporter.rb b/test/exporters/test_3mf_exporter.rb
index 58e1755..93e0a39 100644
--- a/test/exporters/test_3mf_exporter.rb
+++ b/test/exporters/test_3mf_exporter.rb
@@ -4,7 +4,6 @@
 
 class Test3MFExporter < Minitest::Test
   def setup
-    @tmpdir = Dir.mktmpdir
     @box = Mittsu::Mesh.new(
       Mittsu::BoxGeometry.new(1.0, 1.0, 1.0)
     )
@@ -36,10 +35,11 @@ def test_rels_file
   end
 
   def test_export_method_alias
-    assert @exporter.parse(@box)
+    Dir.mktmpdir do |dir|
+      filename = File.join(dir, "test.3mf")
+      @exporter.parse(@box, filename)
+      assert File.exist?(filename)
+    end
   end
 
-  def teardown
-    FileUtils.remove_entry @tmpdir
-  end
 end

From 05ef5007791ab6a6b61242a407ea2f25b0b04f48 Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Fri, 23 Feb 2024 14:50:05 +0000
Subject: [PATCH 15/23] include exporters in simplecov

---
 test/minitest_helper.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/test/minitest_helper.rb b/test/minitest_helper.rb
index 5a84cac..7c7e343 100644
--- a/test/minitest_helper.rb
+++ b/test/minitest_helper.rb
@@ -11,6 +11,7 @@
   add_filter "/test/"
   add_group 'Cameras', 'lib/mittsu/cameras'
   add_group 'Core', 'lib/mittsu/core'
+  add_group 'Exporters', 'lib/mittsu/exporters'
   add_group 'Extras', 'lib/mittsu/extras'
   add_group 'Lights', 'lib/mittsu/lights'
   add_group 'Loaders', 'lib/mittsu/loaders'

From f0b1b16f2b14ac443eff7763f12b79efbba89d18 Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Fri, 23 Feb 2024 14:58:03 +0000
Subject: [PATCH 16/23] remove model name parameterization

---
 lib/mittsu/exporters/3mf_exporter.rb | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/lib/mittsu/exporters/3mf_exporter.rb b/lib/mittsu/exporters/3mf_exporter.rb
index 9a9d1ed..24599de 100644
--- a/lib/mittsu/exporters/3mf_exporter.rb
+++ b/lib/mittsu/exporters/3mf_exporter.rb
@@ -15,12 +15,10 @@ def export(object, filename)
         model_names = models.map do |model|
           # Set a model name if there isn't one
           model.name ||= SecureRandom.uuid
-          # Make model name filesystem-safe
-          name = model.name.parameterize
           # Store model
-          store(zip, "3D/#{name}.model", model_file(model))
+          store(zip, "3D/#{model.name}.model", model_file(model))
           # Remember the name for later
-          name
+          model.name
         end
         # Add OPC rels file with list of contained models
         store(zip, "_rels/.rels", rels_file(model_names))

From 11db7451cea0b034c0e29caeba751089cc5c1b27 Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Fri, 23 Feb 2024 15:11:04 +0000
Subject: [PATCH 17/23] add example for exporting 3MF

---
 .gitignore                          | 1 +
 examples/10_3mf_exporter_example.rb | 7 +++++++
 2 files changed, 8 insertions(+)
 create mode 100644 examples/10_3mf_exporter_example.rb

diff --git a/.gitignore b/.gitignore
index 470dc23..f6e1f58 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,3 +10,4 @@
 /test/reports
 *.gem
 .tool-versions
+/examples/output.3mf
diff --git a/examples/10_3mf_exporter_example.rb b/examples/10_3mf_exporter_example.rb
new file mode 100644
index 0000000..895fc08
--- /dev/null
+++ b/examples/10_3mf_exporter_example.rb
@@ -0,0 +1,7 @@
+require_relative './example_helper'
+
+loader = Mittsu::OBJLoader.new
+object = loader.load(File.expand_path('../male02.obj', __FILE__))
+
+exporter = Mittsu::ThreeMFExporter.new
+exporter.export(object, File.expand_path('../output.3mf', __FILE__))

From eae599c2496976de21f5e8a275a546966cebb634 Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Mon, 26 Feb 2024 10:46:02 +0000
Subject: [PATCH 18/23] traverse all meshes in an object for 3mf output

---
 lib/mittsu/exporters/3mf_exporter.rb | 40 ++++++++++++++++++----------
 1 file changed, 26 insertions(+), 14 deletions(-)

diff --git a/lib/mittsu/exporters/3mf_exporter.rb b/lib/mittsu/exporters/3mf_exporter.rb
index 24599de..0e4da65 100644
--- a/lib/mittsu/exporters/3mf_exporter.rb
+++ b/lib/mittsu/exporters/3mf_exporter.rb
@@ -67,20 +67,9 @@ def model_file(object)
         xml.model unit: "millimeter", "xml:lang": "en-US", xmlns:"http://schemas.microsoft.com/3dmanufacturing/core/2015/02" do
           objectIDs = []
           xml.resources do
-            uuid = SecureRandom.uuid
-            objectIDs << uuid
-            xml.object id: uuid, type: "model" do
-              xml.mesh do
-                xml.vertices do
-                  object.geometry.vertices.each do |vertex|
-                    xml.vertex x: vertex.x, y: vertex.y, z: vertex.z
-                  end
-                end
-                xml.triangles do
-                  object.geometry.faces.each do |face|
-                    xml.triangle v1: face.a, v2: face.b, v3: face.c
-                  end
-                end
+            object.traverse do |x|
+              if (x.is_a? Mesh)
+                objectIDs << build_object(xml, x)
               end
             end
           end
@@ -92,5 +81,28 @@ def model_file(object)
         end
       end
     end
+
+    def build_object(xml, object)
+      uuid = SecureRandom.uuid
+      xml.object id: uuid, type: "model" do
+        build_mesh_element(xml, object.geometry)
+      end
+      uuid
+    end
+
+    def build_mesh_element(xml, geometry)
+      xml.mesh do
+        xml.vertices do
+          geometry.vertices.each do |vertex|
+            xml.vertex x: vertex.x, y: vertex.y, z: vertex.z
+          end
+        end
+        xml.triangles do
+          geometry.faces.each do |face|
+            xml.triangle v1: face.a, v2: face.b, v3: face.c
+          end
+        end
+      end
+    end
   end
 end

From aa8893bbee6a16f0fef4e06b055483a2463c233d Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Mon, 26 Feb 2024 11:00:31 +0000
Subject: [PATCH 19/23] test that grouped meshes are all exported

---
 test/exporters/test_3mf_exporter.rb | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/test/exporters/test_3mf_exporter.rb b/test/exporters/test_3mf_exporter.rb
index 93e0a39..7e6730a 100644
--- a/test/exporters/test_3mf_exporter.rb
+++ b/test/exporters/test_3mf_exporter.rb
@@ -20,6 +20,16 @@ def test_3mf_model_file
     assert_equal 12, REXML::XPath.match(xml, "/model/resources/object/mesh/triangles/triangle").count
   end
 
+  def test_grouped_meshes
+    group = Mittsu::Group.new
+    group.add(@box)
+    group.add(Mittsu::Mesh.new(Mittsu::SphereGeometry.new()))
+    file = @exporter.send(:model_file, group)
+    xml = REXML::Document.new file
+    assert_equal 2, REXML::XPath.match(xml, "/model/resources/object/mesh").count
+    assert_equal 2, REXML::XPath.match(xml, "/model/build/item").count
+  end
+
   def test_content_types_file
     file = @exporter.send(:content_types_file)
     xml = REXML::Document.new file

From 49f8356e885d0615993ada4a9b1d690a2e69dec2 Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Mon, 26 Feb 2024 12:08:53 +0000
Subject: [PATCH 20/23] check that geometry is exported correct for multi-mesh
 3MF models

---
 test/exporters/test_3mf_exporter.rb | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/test/exporters/test_3mf_exporter.rb b/test/exporters/test_3mf_exporter.rb
index 7e6730a..f4cd7fb 100644
--- a/test/exporters/test_3mf_exporter.rb
+++ b/test/exporters/test_3mf_exporter.rb
@@ -27,6 +27,10 @@ def test_grouped_meshes
     file = @exporter.send(:model_file, group)
     xml = REXML::Document.new file
     assert_equal 2, REXML::XPath.match(xml, "/model/resources/object/mesh").count
+    assert_equal 8, REXML::XPath.match(xml, "/model/resources/object[1]/mesh/vertices/vertex").count
+    assert_equal 12, REXML::XPath.match(xml, "/model/resources/object[1]/mesh/triangles/triangle").count
+    assert_equal 63, REXML::XPath.match(xml, "/model/resources/object[2]/mesh/vertices/vertex").count
+    assert_equal 88, REXML::XPath.match(xml, "/model/resources/object[2]/mesh/triangles/triangle").count
     assert_equal 2, REXML::XPath.match(xml, "/model/build/item").count
   end
 

From 9e2c05644138dbb10f7334f37bda72e1245cf75e Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Mon, 26 Feb 2024 14:58:12 +0000
Subject: [PATCH 21/23] add simple OBJ example file and use it in 3MF
 conversion example

---
 .gitignore                          |    2 +-
 examples/10_3mf_exporter_example.rb |    4 +-
 examples/mittsu.obj                 | 2082 +++++++++++++++++++++++++++
 3 files changed, 2085 insertions(+), 3 deletions(-)
 create mode 100644 examples/mittsu.obj

diff --git a/.gitignore b/.gitignore
index f6e1f58..4d7ff8e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,4 +10,4 @@
 /test/reports
 *.gem
 .tool-versions
-/examples/output.3mf
+/examples/mittsu-export.3mf
diff --git a/examples/10_3mf_exporter_example.rb b/examples/10_3mf_exporter_example.rb
index 895fc08..078a760 100644
--- a/examples/10_3mf_exporter_example.rb
+++ b/examples/10_3mf_exporter_example.rb
@@ -1,7 +1,7 @@
 require_relative './example_helper'
 
 loader = Mittsu::OBJLoader.new
-object = loader.load(File.expand_path('../male02.obj', __FILE__))
+object = loader.load(File.expand_path('../mittsu.obj', __FILE__))
 
 exporter = Mittsu::ThreeMFExporter.new
-exporter.export(object, File.expand_path('../output.3mf', __FILE__))
+exporter.export(object, File.expand_path('../mittsu-export.3mf', __FILE__))
diff --git a/examples/mittsu.obj b/examples/mittsu.obj
new file mode 100644
index 0000000..9dcfca4
--- /dev/null
+++ b/examples/mittsu.obj
@@ -0,0 +1,2082 @@
+# Object Export From Tinkercad Server 2015
+
+mtllib obj.mtl
+
+o obj_0
+v -35.32 		3.63 		0
+v -35.32 		3.63 		10
+v -35.32 		23.47 		10
+v -35.32 		23.47 		0
+v 36.24 		18.53 		0
+v 38.72 		18.53 		0
+v 36.04 		8.47 		0
+v 36.151 		9.17 		0
+v 36.218 		9.937 		0
+v 36.24 		10.77 		0
+v 38.72 		3.63 		0
+v 33.036 		5.43 		0
+v 33.656 		5.55 		0
+v 34.2 		5.75 		0
+v 34.662 		6.017 		0
+v 35.062 		6.363 		0
+v 35.4 		6.79 		0
+v 35.667 		7.279 		0
+v 35.88 		7.839 		0
+v 36.36 		5.61 		0
+v 36.22 		5.61 		0
+v 35.978 		5.239 		0
+v 35.704 		4.899 		0
+v 35.4 		4.59 		0
+v 35.082 		4.326 		0
+v 36.72 		3.63 		0
+v 34.742 		4.092 		0
+v 34.38 		3.89 		0
+v 34 		3.73 		0
+v 33.607 		3.597 		0
+v 33.2 		3.49 		0
+v 32.782 		3.412 		0
+v 26.94 		18.53 		0
+v 29.4 		18.53 		0
+v 20.62 		16.45 		0
+v 21.2 		18.49 		0
+v 21.909 		18.283 		0
+v 22.596 		18.037 		0
+v 23.26 		17.75 		0
+v 20.004 		16.606 		0
+v 19.384 		16.699 		0
+v 18.76 		16.73 		0
+v 17.931 		16.679 		0
+v 17.258 		16.526 		0
+v 16.66 		18.53 		0
+v 17.322 		18.674 		0
+v 18.029 		18.761 		0
+v 18.78 		18.79 		0
+v 19.636 		18.757 		0
+v 20.442 		18.657 		0
+v 29.4 		8.91 		0
+v 26.94 		8.79 		0
+v 29.48 		7.834 		0
+v 29.72 		6.954 		0
+v 30.12 		6.27 		0
+v 30.687 		5.781 		0
+v 31.427 		5.488 		0
+v 32.34 		5.39 		0
+v 32.356 		3.366 		0
+v 31.92 		3.35 		0
+v 31.138 		3.383 		0
+v 30.418 		3.483 		0
+v 29.76 		3.65 		0
+v 29.169 		3.901 		0
+v 28.649 		4.228 		0
+v 28.2 		4.63 		0
+v 27.809 		5.112 		0
+v 27.489 		5.679 		0
+v 27.24 		6.33 		0
+v 27.073 		7.057 		0
+v 26.973 		7.877 		0
+v 22.42 		15.75 		0
+v 21.829 		16.006 		0
+v 21.229 		16.239 		0
+v 16.74 		16.27 		0
+v 16.533 		13.706 		0
+v 16.76 		13.49 		0
+v 17.04 		13.277 		0
+v 17.373 		13.063 		0
+v 17.76 		12.85 		0
+v 18.22 		12.63 		0
+v 18.747 		12.397 		0
+v 20.84 		8.27 		0
+v 20.733 		8.494 		0
+v 20.573 		8.714 		0
+v 20.531 		11.599 		0
+v 21.06 		11.33 		0
+v 21.542 		11.05 		0
+v 21.976 		10.743 		0
+v 22.36 		10.41 		0
+v 22.68 		10.059 		0
+v 22.947 		9.672 		0
+v 23.16 		9.25 		0
+v -8.8 		22.53 		0
+v 23.327 		8.792 		0
+v 23.427 		8.272 		0
+v -8.811 		22.794 		0
+v 20.36 		8.93 		0
+v -8.844 		23.028 		0
+v 20.091 		9.157 		0
+v -8.9 		23.23 		0
+v 19.764 		9.383 		0
+v -8.989 		23.417 		0
+v -9.096 		23.577 		0
+v 19.38 		9.61 		0
+v 18.927 		9.846 		0
+v -9.22 		23.71 		0
+v -9.36 		23.83 		0
+v 18.393 		10.099 		0
+v -9.513 		23.923 		0
+v 19.34 		12.15 		0
+v 19.958 		11.872 		0
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+f 630 	642 	629
+f 373 	385 	395
+f 396 	397 	376
+f 375 	374 	399
+f 643 	642 	641
+f 643 	641 	644
+f 320 	305 	322
+f 319 	306 	321
+f 318 	307 	319
+f 317 	303 	318
+f 316 	304 	317
+f 315 	304 	316
+f 579 	576 	530
+f 314 	302 	315
+f 190 	191 	326
+f 332 	338 	333
+f 639 	646 	645
+f 639 	645 	640
+f 4 	630 	629
+f 336 	333 	338
+f 332 	326 	338
+f 328 	326 	330
+f 332 	330 	326
+f 325 	338 	326
+f 78 	77 	467
+f 468 	78 	467
+f 630 	4 	3
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+f 123 	121 	113
+f 123 	113 	110
+f 123 	110 	108
+f 123 	108 	107
+f 123 	107 	104
+f 123 	104 	103
+f 123 	103 	101
+f 123 	101 	99
+f 123 	99 	97
+f 94 	163 	97
+f 136 	163 	94
+f 80 	468 	470
+f 132 	163 	136
+f 131 	163 	132
+f 127 	126 	163
+f 142 	163 	126
+f 470 	472 	80
+f 2 	1 	647
+f 2 	647 	648
+f 82 	472 	473
+f 649 	650 	648
+f 649 	648 	647
+f 378 	377 	401
+f 191 	566 	567
+f 190 	327 	566
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+f 155 	97 	157
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+f 123 	97 	153
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+f 142 	146 	144
+f 142 	144 	143
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+f 584 	532 	544
+f 225 	224 	617
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+f 325 	532 	338
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+f 532 	534 	544
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+f 229 	228 	619
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+f 232 	622 	625
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+f 582 	579 	530
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+f 4 	629 	652
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+f 4 	652 	653
+f 4 	653 	654
+f 4 	654 	655
+f 4 	655 	656
+f 4 	656 	657
+f 4 	657 	658
+f 4 	658 	659
+f 4 	659 	660
+f 4 	660 	649
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+f 4 	649 	1
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+f 669 	170 	591
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+f 662 	672 	664
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+f 402 	664 	676
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+f 394 	395 	385
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+f 374 	376 	397
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+f 399 	398 	375
+f 398 	400 	375
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+f 401 	377 	400
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+f 388 	381 	201
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+f 413 	414 	678
+f 412 	413 	677
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+f 683 	684 	680
+f 409 	664 	402
+f 171 	204 	577
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+f 685 	686 	682
+f 387 	386 	195
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+f 681 	680 	684
+f 204 	578 	577
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+f 195 	197 	387
+f 197 	199 	387
+f 181 	460 	481
+f 482 	485 	181
+f 206 	581 	207
+f 485 	245 	181
+f 208 	181 	245
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+f 205 	242 	270
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+f 241 	235 	270
+f 257 	260 	216
+f 230 	216 	260
+f 260 	263 	230
+f 226 	230 	263
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+f 266 	265 	227
+f 265 	269 	227
+f 234 	227 	269
+f 270 	234 	269
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+f 335 	327 	331
+f 335 	334 	339
+f 339 	327 	335
+f 324 	327 	339
+f 329 	331 	327
+f 379 	254 	252
+f 352 	665 	351
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+f 344 	349 	343
+f 345 	349 	344
+f 346 	349 	345
+f 347 	349 	346
+f 348 	349 	347
+f 350 	341 	349
+f 351 	341 	350
+f 142 	143 	359
+f 595 	594 	220
+f 340 	351 	358
+f 353 	355 	351
+f 355 	356 	351
+f 357 	351 	356
+f 382 	259 	381
+f 258 	381 	259
+f 360 	143 	361
+f 382 	383 	259
+f 144 	362 	361
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+f 148 	363 	362
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+f 366 	661 	364
+f 661 	663 	364
+f 352 	364 	663
+f 352 	663 	665
+f 359 	351 	665
+f 360 	351 	359
+f 361 	351 	360
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+f 363 	354 	351
+f 354 	353 	351
+f 361 	362 	351
+f 385 	264 	384
+f 262 	384 	264
+f 669 	591 	670
+f 593 	670 	591
+f 126 	354 	148
+f 192 	568 	194
+f 339 	494 	324
+f 324 	494 	186
+f 571 	196 	569
+f 352 	123 	153
+f 352 	153 	364
+f 386 	267 	682
+f 287 	682 	267
+f 365 	364 	155
+f 153 	155 	364
+f 480 	481 	460
+f 481 	482 	181
+f 365 	155 	366
+f 157 	366 	155
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+f 660 	650 	649
+f 268 	387 	258
+f 189 	186 	461
+f 661 	366 	160
+f 157 	160 	366
+f 659 	690 	689
+f 659 	689 	660
+f 461 	186 	494
+f 372 	273 	256
+f 651 	645 	646
+f 651 	646 	691
+f 661 	160 	663
+f 162 	663 	160
+f 461 	464 	189
+f 464 	466 	453
+f 373 	376 	243
+f 658 	692 	690
+f 658 	690 	659
+f 665 	663 	163
+f 162 	163 	663
+f 657 	693 	692
+f 657 	692 	658
+f 665 	163 	359
+f 142 	359 	163
+f 458 	453 	469
+f 466 	469 	453
+f 469 	471 	458
+f 471 	474 	458
+f 474 	476 	458
+f 460 	458 	476
+f 476 	478 	460
+f 478 	480 	460
+f 656 	694 	693
+f 656 	693 	657
+f 340 	358 	94
+f 698 	652 	691
+f 655 	695 	694
+f 655 	694 	656
+f 209 	208 	248
+f 248 	250 	209
+f 211 	209 	250
+f 250 	253 	211
+f 222 	211 	253
+f 253 	255 	222
+f 340 	94 	341
+f 97 	341 	94
+f 453 	189 	464
+f 654 	696 	695
+f 654 	695 	655
+f 97 	99 	341
+f 342 	341 	99
+f 651 	691 	652
+f 609 	615 	624
+f 605 	609 	624
+f 653 	697 	696
+f 653 	696 	654
+f 600 	605 	624
+f 342 	99 	343
+f 101 	343 	99
+f 652 	698 	697
+f 652 	697 	653
+f 103 	344 	343
+f 103 	343 	101
+f 473 	505 	82
+f 607 	601 	624
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+f 615 	614 	624
+f 614 	632 	624
+f 256 	254 	372
+f 620 	611 	628
+f 624 	628 	611
+f 611 	607 	624
+f 344 	103 	345
+f 104 	345 	103
+f 489 	95 	490
+f 628 	644 	620
+f 93 	491 	490
+f 93 	490 	95
+f 104 	107 	345
+f 346 	345 	107
+f 632 	634 	624
+f 638 	624 	634
+f 638 	634 	636
+f 92 	492 	93
+f 630 	691 	641
+f 107 	108 	347
+f 107 	347 	346
+f 620 	644 	639
+f 644 	641 	639
+f 639 	641 	646
+f 348 	347 	110
+f 108 	110 	347
+f 493 	91 	90
+f 348 	110 	349
+f 113 	349 	110
+f 268 	267 	386
+f 646 	641 	691
+f 350 	349 	117
+f 113 	117 	349
+f 698 	691 	630
+f 117 	121 	351
+f 117 	351 	350
+f 284 	388 	201
+f 284 	201 	298
+f 87 	487 	486
+f 3 	698 	630
+f 352 	351 	123
+f 127 	353 	126
+f 353 	127 	355
+f 129 	355 	127
+f 281 	391 	282
+f 690 	3 	689
+f 692 	3 	690
+f 650 	689 	3
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+f 694 	3 	693
+f 695 	3 	694
+f 696 	3 	695
+f 697 	3 	696
+f 698 	3 	697
+f 3 	2 	650
+f 648 	650 	2
+f 355 	129 	356
+f 131 	356 	129
+f 280 	392 	281
+f 475 	83 	130
+f 6 	5 	666
+f 6 	666 	662
+f 131 	132 	356
+f 357 	132 	358
+f 8 	7 	667
+f 8 	667 	668
+f 136 	94 	358
+f 9 	8 	668
+f 9 	668 	671
+f 10 	9 	671
+f 10 	671 	672
+f 360 	359 	143
+f 672 	666 	10
+f 5 	10 	666
+f 144 	361 	143
+f 578 	204 	203
+f 203 	580 	578
+f 202 	215 	580
+f 27 	415 	414
+f 14 	678 	679
+f 14 	679 	408
+f 404 	415 	27
+f 26 	11 	409
+f 463 	76 	207
+f 100 	98 	496
+f 585 	215 	214
+f 675 	18 	17
+f 587 	214 	213
+f 100 	496 	102
+f 497 	102 	496
+f 20 	409 	402
+f 213 	588 	587
+f 676 	667 	7
+f 588 	210 	589
+f 115 	502 	501
+f 678 	13 	677
+f 403 	20 	402
+f 102 	497 	105
+f 105 	498 	499
+f 15 	14 	408
+f 21 	20 	403
+f 194 	569 	196
+f 21 	403 	407
+f 673 	16 	408
+f 502 	115 	503
+f 571 	198 	196
+f 200 	198 	575
+f 499 	500 	109
+f 200 	575 	206
+f 109 	500 	503
+f 73 	72 	456
+f 412 	411 	31
+f 203 	202 	580
+f 276 	396 	277
+f 275 	397 	276
+f 271 	398 	272
+f 585 	580 	215
+f 17 	673 	674
+f 398 	271 	274
+f 674 	675 	17
+f 12 	677 	13
+f 588 	213 	212
+f 14 	13 	678
+f 212 	210 	588
+f 15 	408 	16
+f 673 	17 	16
+f 401 	274 	273
+f 675 	676 	18
+f 19 	18 	676
+f 220 	589 	210
+f 372 	401 	273
+f 676 	7 	19
+f 220 	219 	595
+f 554 	285 	180
+f 219 	218 	596
+f 219 	596 	595
+f 404 	27 	25
+f 683 	555 	288
+f 555 	179 	288
+f 596 	218 	597
+f 217 	597 	218
+f 404 	25 	405
+f 24 	405 	25
+f 554 	680 	285
+f 116 	501 	217
+f 406 	405 	23
+f 24 	23 	405
+f 681 	286 	680
+f 285 	680 	286
+f 603 	602 	221
+f 287 	286 	682
+f 681 	682 	286
+f 23 	22 	406
+f 407 	406 	22
+f 409 	20 	26
+f 224 	602 	616
+f 664 	409 	11
+f 410 	447 	32
+f 288 	684 	683
+f 31 	410 	32
+f 617 	224 	616
+f 30 	412 	31
+f 289 	290 	685
+f 289 	685 	684
+f 30 	29 	412
+f 413 	412 	29
+f 413 	29 	414
+f 28 	414 	29
+f 686 	685 	291
+f 290 	291 	685
+f 414 	28 	27
+f 228 	617 	618
+f 687 	686 	292
+f 291 	292 	686
+f 51 	34 	416
+f 34 	33 	417
+f 34 	417 	416
+f 292 	293 	688
+f 292 	688 	687
+f 619 	228 	618
+f 293 	193 	688
+f 456 	459 	73
+f 74 	73 	459
+f 40 	418 	423
+f 40 	423 	424
+f 240 	368 	221
+f 459 	418 	74
+f 233 	625 	626
+f 419 	72 	39
+f 603 	221 	368
+f 75 	44 	462
+f 626 	523 	233
+f 431 	46 	432
+f 46 	433 	432
+f 462 	568 	75
+f 192 	75 	568
+f 35 	74 	418
+f 463 	77 	76
+f 79 	78 	468
+f 468 	80 	79
+f 81 	80 	472
+f 472 	82 	81
+f 489 	96 	95
+f 425 	426 	43
+f 43 	426 	427
+f 43 	427 	44
+f 91 	493 	92
+f 428 	49 	429
+f 484 	90 	89
+f 430 	429 	48
+f 49 	48 	429
+f 486 	484 	88
+f 89 	88 	484
+f 48 	431 	430
+f 88 	87 	486
+f 35 	418 	40
+f 84 	83 	475
+f 84 	475 	477
+f 420 	419 	38
+f 39 	38 	419
+f 477 	479 	84
+f 85 	84 	479
+f 420 	38 	421
+f 37 	421 	38
+f 37 	36 	422
+f 37 	422 	421
+f 479 	495 	85
+f 36 	428 	422
+f 86 	112 	504
+f 424 	41 	40
+f 425 	42 	424
+f 41 	424 	42
+f 505 	504 	111
+f 112 	111 	504
+f 42 	425 	43
+f 111 	82 	505
+f 98 	85 	495
+f 427 	462 	44
+f 495 	496 	98
+f 36 	50 	428
+f 50 	49 	428
+f 217 	501 	597
+f 431 	48 	47
+f 47 	46 	431
+f 433 	46 	45
+f 501 	116 	115
+f 45 	546 	433
+f 416 	434 	51
+f 105 	499 	106
+f 51 	434 	436
+f 435 	417 	52
+f 33 	52 	417
+f 114 	503 	115
+f 452 	435 	71
+f 499 	109 	106
+f 503 	114 	109
+f 54 	436 	437
+f 54 	437 	438
+f 57 	439 	440
+f 58 	57 	440
+f 58 	440 	441
+f 441 	677 	58
+f 59 	32 	447
+f 435 	52 	71
+f 454 	69 	455
+f 69 	448 	455
+f 138 	137 	520
+f 145 	141 	522
+f 147 	233 	523
+f 524 	149 	523
+f 147 	523 	149
+f 525 	149 	524
+f 65 	64 	451
+f 158 	529 	531
+f 63 	443 	442
+f 159 	158 	531
+f 159 	531 	533
+f 443 	63 	444
+f 62 	444 	63
+f 533 	535 	159
+f 61 	445 	444
+f 61 	444 	62
+f 507 	118 	535
+f 445 	61 	446
+f 60 	446 	61
+f 168 	543 	371
+f 446 	60 	447
+f 59 	447 	60
+f 167 	538 	543
+f 167 	543 	168
+f 538 	167 	539
+f 166 	539 	167
+f 539 	166 	540
+f 165 	540 	166
+f 164 	541 	540
+f 164 	540 	165
+f 71 	70 	454
+f 71 	454 	452
+f 70 	69 	454
+f 69 	68 	448
+f 506 	118 	507
+f 449 	448 	67
+f 68 	67 	448
+f 67 	66 	450
+f 67 	450 	449
+f 450 	66 	451
+f 65 	451 	66
+f 53 	51 	436
+f 54 	53 	436
+f 55 	54 	438
+f 130 	512 	513
+f 438 	439 	55
+f 56 	55 	439
+f 439 	57 	56
+f 130 	513 	475
+f 677 	12 	58
+f 442 	451 	64
+f 64 	63 	442
+f 519 	139 	520
+f 119 	118 	506
+f 120 	119 	508
+f 506 	508 	119
+f 122 	120 	508
+f 122 	508 	509
+f 509 	510 	122
+f 124 	122 	510
+f 510 	511 	124
+f 125 	124 	511
+f 511 	512 	125
+f 128 	125 	512
+f 512 	130 	128
+f 514 	135 	515
+f 134 	515 	135
+f 133 	516 	515
+f 133 	515 	134
+f 489 	516 	96
+f 133 	96 	516
+f 517 	522 	141
+f 517 	141 	518
+f 140 	518 	141
+f 139 	519 	518
+f 139 	518 	140
+f 138 	520 	139
+f 521 	520 	137
+f 514 	521 	137
+f 514 	137 	135
+f 522 	541 	164
+f 145 	522 	164
+# 1368 faces
+
+ #end of obj_0
+

From a9f84f13c92534169f68ded19ec1e46735ab3953 Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Wed, 28 Feb 2024 10:03:14 +0000
Subject: [PATCH 22/23] require rexml in dev for testing 3mf output

---
 mittsu.gemspec | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mittsu.gemspec b/mittsu.gemspec
index 645b9df..d63bf2c 100644
--- a/mittsu.gemspec
+++ b/mittsu.gemspec
@@ -36,4 +36,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'pry'
   spec.add_development_dependency 'benchmark-ips'
   spec.add_development_dependency 'simplecov', '0.17.1'
+  spec.add_development_dependency 'rexml'
 end

From 57986ea60449962c3cd43e54eee0b70e3254aeff Mon Sep 17 00:00:00 2001
From: James Smith <james@floppy.org.uk>
Date: Mon, 13 May 2024 11:04:23 +0100
Subject: [PATCH 23/23] sanitize filenames in 3mf output

---
 lib/mittsu/exporters/3mf_exporter.rb | 9 +++++++--
 test/exporters/test_3mf_exporter.rb  | 6 ++++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/lib/mittsu/exporters/3mf_exporter.rb b/lib/mittsu/exporters/3mf_exporter.rb
index 0e4da65..ee6b1c7 100644
--- a/lib/mittsu/exporters/3mf_exporter.rb
+++ b/lib/mittsu/exporters/3mf_exporter.rb
@@ -16,9 +16,10 @@ def export(object, filename)
           # Set a model name if there isn't one
           model.name ||= SecureRandom.uuid
           # Store model
-          store(zip, "3D/#{model.name}.model", model_file(model))
+          name = filesystem_safe_name(model)
+          store(zip, "3D/#{name}.model", model_file(model))
           # Remember the name for later
-          model.name
+          name
         end
         # Add OPC rels file with list of contained models
         store(zip, "_rels/.rels", rels_file(model_names))
@@ -31,6 +32,10 @@ def export(object, filename)
 
     private
 
+    def filesystem_safe_name(model)
+      model.name.delete("/\\?*:|\"<>")
+    end
+
     def store(zip, filename, data)
       zip.put_next_entry(filename)
       zip.write(data)
diff --git a/test/exporters/test_3mf_exporter.rb b/test/exporters/test_3mf_exporter.rb
index f4cd7fb..10b061d 100644
--- a/test/exporters/test_3mf_exporter.rb
+++ b/test/exporters/test_3mf_exporter.rb
@@ -11,6 +11,12 @@ def setup
     @exporter = Mittsu::ThreeMFExporter.new
   end
 
+  def test_filename_sanitization
+    @box.name = "<box>"
+    name = @exporter.send(:filesystem_safe_name, @box)
+    assert_equal "box", name
+  end
+
   def test_3mf_model_file
     file = @exporter.send(:model_file, @box)
     xml = REXML::Document.new file