change draco compression for gltf files to optional. toggle shows in panel when gltf format is selected. disabled by default.

Author: speculative-artefact

operators.py

@@ -1634,8 +1634,8 @@ def convert_axis_for_export(axis_value):
                     export_jpeg_quality=export_quality,
                     export_image_quality=export_quality,
                     export_def_bones=False, # Don't export bones
-                    # Enable Draco compression for geometry
-                    export_draco_mesh_compression_enable=True,
+                    # Enable Draco compression for geometry based on user setting
+                    export_draco_mesh_compression_enable=scene_props.mesh_export_use_draco_compression,
                     export_draco_mesh_compression_level=6,
                     export_draco_position_quantization=14,
                     export_draco_normal_quantization=10,

panels.py

@@ -84,6 +84,9 @@ def draw(self, context):
             col = layout.column(heading="Materials", align=True)
             row = col.row(align=True)
             row.prop(settings, "mesh_export_gltf_materials")
+            
+            col = layout.column(heading="Compression", align=True)
+            col.prop(settings, "mesh_export_use_draco_compression")
 
         # Coordinate system settings
         if self.format_has_coordinates(settings.mesh_export_format):

properties.py

@@ -70,6 +70,13 @@ class MeshExporterSettings(PropertyGroup):
         ],
         default="EXPORT"
     )
+    
+    # GLTF Draco compression property
+    mesh_export_use_draco_compression: BoolProperty(
+        name="Draco Compression",
+        description="Enable Draco mesh compression for smaller file sizes. Note: Godot has its own runtime compression, so this is typically not needed for Godot imports",
+        default=False
+    )
 
     # Scale property
     mesh_export_scale: FloatProperty(