Use assimp 3d library directly rather than calling the binary

.github/actions/setup/action.yml

@@ -7,7 +7,7 @@ runs:
     - name: Install system requirements
       uses: awalsh128/cache-apt-pkgs-action@latest
       with:
-        packages: assimp-utils
+        packages: libassimp-dev
     - name: Set up Ruby and install gems
       uses: ruby/setup-ruby@v1
       with:

Gemfile

@@ -215,3 +215,5 @@ gem "image_processing"
 gem "csv", "~> 3.3"
 
 gem "arel_extensions", "~> 2.3"
+
+gem "assimp-ffi", git: "https://github.com/Kerilk/assimp-ruby.git"

Gemfile.lock

@@ -1,3 +1,10 @@
+GIT
+  remote: https://github.com/Kerilk/assimp-ruby.git
+  revision: a36639b60556dcd9982e6305089fe32e6d716d6a
+  specs:
+    assimp-ffi (0.1.8)
+      ffi (~> 1.9, >= 1.9.19)
+
 GIT
   remote: https://github.com/el-cms/capybara-screenshot.git
   revision: 386c0541a428b8d025c936e3b6ebd6d2d2240523
@@ -930,6 +937,7 @@ DEPENDENCIES
   acts_as_favoritor (~> 6.0)
   altcha-rails (~> 0.0.6)
   arel_extensions (~> 2.3)
+  assimp-ffi!
   aws-sdk-s3 (< 1.200)
   better_content_security_policy (~> 0.1)
   bootsnap (~> 1.18)
@@ -1065,6 +1073,7 @@ CHECKSUMS
   aes_key_wrap (1.1.0) sha256=b935f4756b37375895db45669e79dfcdc0f7901e12d4e08974d5540c8e0776a5
   altcha-rails (0.0.6) sha256=0da0f081439abae730a797ab2f6b86a46ad2b533017db2a872488785cc35fae4
   arel_extensions (2.3.3) sha256=65bd6f4286d11447be528f4bb153d84a951870999149c76b4cbf3929226f4c1d
+  assimp-ffi (0.1.8)
   ast (2.4.3) sha256=954615157c1d6a382bc27d690d973195e79db7f55e9765ac7c481c60bdb4d383
   attr_required (1.0.2) sha256=f0ebfc56b35e874f4d0ae799066dbc1f81efefe2364ca3803dc9ea6a4de6cb99
   aws-eventstream (1.4.0) sha256=116bf85c436200d1060811e6f5d2d40c88f65448f2125bc77ffce5121e6e183b

app/uploaders/application_uploader.rb

@@ -61,29 +61,33 @@ def generate_location(io, record: nil, derivative: nil, metadata: {}, **)
   rescue NoMethodError
   end
 
-  BB_REGEXP = /Minimum point\s+\((?<min_x>[[:digit:]\-\.]+)\s+(?<min_y>[[:digit:]\-\.]+)\s(?<min_z>[[:digit:]\-\.]+)\)\nMaximum point\s+\((?<max_x>[[:digit:]\-\.]+)\s+(?<max_y>[[:digit:]\-\.]+)\s(?<max_z>[[:digit:]\-\.]+)\)/
-
   add_metadata :object do |io|
     Shrine.with_file(io) do |it|
-      output = Open3.capture2 "assimp", "info", it.path
-      if (match = output.first.match(BB_REGEXP))
-        {
-          "bounding_box" => {
-            "minimum" => {
-              "x" => match[:min_x].to_f,
-              "y" => match[:min_y].to_f,
-              "z" => match[:min_z].to_f
-            },
-            "maximum" => {
-              "x" => match[:max_x].to_f,
-              "y" => match[:max_y].to_f,
-              "z" => match[:max_z].to_f
-            }
+      scene = Assimp.import_file(it.path)
+      scene.apply_post_processing(
+        0x80000000 # GenBoundingBox step, currently missing from assimp-ffi
+      )
+      bboxes = scene.meshes.map(&:aabb)
+      {
+        "bounding_box" => {
+          "minimum" => {
+            "x" => bboxes.map { |it| it.min.x }.min,
+            "y" => bboxes.map { |it| it.min.y }.min,
+            "z" => bboxes.map { |it| it.min.z }.min
+          },
+          "maximum" => {
+            "x" => bboxes.map { |it| it.max.x }.max,
+            "y" => bboxes.map { |it| it.max.y }.max,
+            "z" => bboxes.map { |it| it.max.z }.max
           }
         }
-      end
+      }
+    rescue => ex
+      # Assimp doesn't raise a specific error for failed load,
+      # just throws a string, so we have to catch all and absorb
+      Rails.logger.debug { "Load error: '#{ex.message}'" }
+      nil
     end
-  rescue NoMethodError
   end
 
   Attacher.derivatives do |original|

docker/build.dockerfile

@@ -19,7 +19,8 @@ RUN apk add --no-cache \
   imagemagick \
   imagemagick-jpeg \
   imagemagick-webp \
-  imagemagick-heic
+  imagemagick-heic \
+  assimp-dev
 
 COPY package.json .
 COPY yarn.lock .

docker/runtime.dockerfile

@@ -10,7 +10,7 @@ RUN apk add --no-cache \
   imagemagick-jpeg \
   imagemagick-webp \
   imagemagick-heic \
-  assimp
+  assimp-dev
 
 COPY . .
 COPY --from=build /usr/src/app/vendor/bundle vendor/bundle