Generate progressive mesh derivative files

Gemfile

@@ -105,8 +105,9 @@ gem "acts_as_favoritor", "~> 6.0"
 gem "sqlite3_ar_regexp", "~> 3.0"
 
 gem "mittsu", "~> 0.5"
-gem "mittsu-mesh_analysis"
+gem "mittsu-mesh_analysis", github: "manyfold3d/mittsu-mesh_analysis"
 gem "mittsu-3mf"
+gem "mittsu-gltf", github: "manyfold3d/mittsu-gltf"
 
 gem "rails-controller-testing", "~> 1.0", group: :test
 

Gemfile.lock

@@ -14,6 +14,21 @@ GIT
     caber (0.4.0)
       rails (>= 7.1.4)
 
+GIT
+  remote: https://github.com/manyfold3d/mittsu-gltf.git
+  revision: 82ca727a6f84d23765bb67c75240b6577885fa6a
+  specs:
+    mittsu-gltf (0.2.0)
+      jbuilder (~> 2.13)
+      mittsu (~> 0.4)
+
+GIT
+  remote: https://github.com/manyfold3d/mittsu-mesh_analysis.git
+  revision: 63bff9274a054e67973956048d3b057fea4ce8f6
+  specs:
+    mittsu-mesh_analysis (0.1.0)
+      mittsu (~> 0.4)
+
 GIT
   remote: https://github.com/manyfold3d/rubocop-pundit.git
   revision: 1f511e087a58867279ca8d77e0bb97dc2ce2da75
@@ -489,8 +504,6 @@ GEM
       builder (~> 3.3)
       mittsu (~> 0.4)
       rubyzip (~> 2.3)
-    mittsu-mesh_analysis (0.1.0)
-      mittsu (~> 0.4)
     msgpack (1.8.0)
     multi_json (1.15.0)
     mysql2 (0.5.6)
@@ -977,7 +990,8 @@ DEPENDENCIES
   memoist (~> 0.16)
   mittsu (~> 0.5)
   mittsu-3mf
-  mittsu-mesh_analysis
+  mittsu-gltf!
+  mittsu-mesh_analysis!
   mysql2 (~> 0.5)
   nanoid (~> 2.0)
   omniauth (~> 2.1)

app/controllers/settings_controller.rb

@@ -96,6 +96,7 @@ def update_download_settings(settings)
     SiteSettings.pregenerate_downloads = (settings[:pregenerate] == "1")
     SiteSettings.download_expiry_time_in_hours = (settings[:expiry].to_i)
     SiteSettings.generate_image_derivatives = (settings[:image_derivatives] == "1")
+    SiteSettings.generate_progressive_meshes = (settings[:progressive_meshes] == "1")
   end
 
   def update_integrations_settings(settings)

app/jobs/analysis/geometric_analysis_job.rb

@@ -34,6 +34,20 @@ def perform(file_id)
         #     !mesh.solid?
         #   )
         # end
+        if SiteSettings.generate_progressive_meshes && mesh.manifold?
+          pmesh = Mittsu::MeshAnalysis::ProgressiveMesh.new(
+            file.mesh.geometry,
+            file.mesh.material
+          )
+          pmesh.progressify(ratio: 0.9)
+          exporter = Mittsu::GLTFExporter.new
+          Tempfile.create do |f|
+            exporter.export(pmesh, f.path, mode: :binary)
+            f.rewind
+            file.attachment_attacher.add_derivatives({progressive: f})
+            file.save(touch: false)
+          end
+        end
       else
         raise MeshLoadError.new
       end

app/models/site_settings.rb

@@ -39,6 +39,7 @@ class SiteSettings < RailsSettings::Base
   field :pregenerate_downloads, type: :boolean, default: false
   field :download_expiry_time_in_hours, type: :integer, default: 24
   field :generate_image_derivatives, type: :boolean, default: false
+  field :generate_progressive_meshes, type: :boolean, default: false
 
   field :allow_robots, type: :boolean, default: false
   field :allow_ai_bots, type: :boolean, default: false

app/views/settings/downloads.html.erb

@@ -30,5 +30,12 @@
       <small><%= t(".derivatives.images.help") %></small>
     </div>
   </div>
+  <div class="row mb-2">
+    <%= form.label nil, t(".derivatives.progressive_meshes.label"), for: "downloads[progressive_meshes]", class: "col-sm-4 col-form-label" %>
+    <div class="col-sm-8 form-check form-switch">
+      <%= form.check_box "downloads[progressive_meshes]", checked: SiteSettings.generate_progressive_meshes, class: "form-check-input" %>
+      <small><%= t(".derivatives.progressive_meshes.help") %></small>
+    </div>
+  </div>
   <%= render "submit", form: form %>
 <% end %>

config/locales/settings/en.yml

@@ -65,11 +65,14 @@ en:
         title: New Domain Block
     downloads:
       derivatives:
-        description: Manyfold can create alternative versions of some files to increase site performance. Note that this will use more disk space.
+        description: Manyfold can create alternative versions of some files to increase site performance. Note that this will use more disk space; it won't clutter up your model folders though, the derived files are kept separate.
         heading: File Derivatives
         images:
           help: Generates lower-resolution versions of images that will load quicker on list and model pages.
           label: Image thumbnails
+        progressive_meshes:
+          help: Generates streamable versions of 3d models that will load quickly at a low resolution, then refine.
+          label: Streamable meshes
       description: Manyfold will generate ZIP files of models on request, but for busy sites you may want these available more quickly. Here you can tell Manyfold to create ZIP files immediately, and also set how long they are kept in the download cache. Beware; this may use a lot of disk space!
       expiry:
         help: A setting of 0 means keep forever.

spec/jobs/analysis/geometric_analysis_job_spec.rb

@@ -21,6 +21,13 @@
     expect { described_class.perform_now(file.id) }.not_to change(Problem, :count)
   end
 
+  it "creates progressive derivative" do
+    allow(SiteSettings).to receive(:generate_progressive_meshes).and_return(true)
+    allow(file).to receive(:mesh).and_return(mesh)
+    described_class.perform_now(file.id)
+    expect(file.reload.attachment(:progressive)).to be_present
+  end
+
   it "creates a Problem for a non-manifold mesh" do # rubocop:todo RSpec/MultipleExpectations
     allow(mesh).to receive(:manifold?).and_return(false)
     allow(file).to receive(:mesh).and_return(mesh)