added blender export script

example/aframe/sandbox/example.gltf

@@ -1 +0,0 @@
-assets/example.gltf

example/aframe/sandbox/index.glb

@@ -0,0 +1 @@
+assets/index.glb

example/assets/index.py

@@ -0,0 +1,70 @@
+#
+# This is a convenient way to convert the scene to lowpoly
+# (by adding decimate-modifiers)
+# and then exporting a gltf to to <blenderdocument>.glb
+# 
+# All this is done automatically when saving the blender file
+#
+import bpy
+import os
+from bpy_extras.io_utils import ImportHelper
+
+# uncomment below in case you want to hardcode the exported filename
+data = {
+ #gltf_file="/some/path/foo.index.glb"
+}
+
+def notify(message = "", title = "Message Box", icon = 'INFO'):
+    def draw(self, context):
+        self.layout.label(text=message)
+    bpy.context.window_manager.popup_menu(draw, title = title, icon = icon)
+
+# redirect print to all consoles
+def print(data):
+    for window in bpy.context.window_manager.windows:
+        screen = window.screen
+        for area in screen.areas:
+            if area.type == 'CONSOLE':
+                override = {'window': window, 'screen': screen, 'area': area}
+                bpy.ops.console.scrollback_append(override, text=str(data), type="OUTPUT")
+                
+
+# Function to add Decimate Modifier to objects without one (except those in the exclusion list)
+def add_decimate_modifier_to_objects():
+    for obj in bpy.data.objects:
+        print(obj.type)
+        if obj is not None and (obj.type == 'FONT' or (obj.type == 'MESH' and len(obj.data.polygons) > 8)):
+            if not obj.modifiers.get("Decimate"):
+                #if obj.name not in exclusion_list and "Decimate" not in obj.modifiers:
+                print("adding decimate-modifier to:"+obj.name)
+                bpy.context.view_layer.objects.active = obj
+                bpy.data.objects[obj.name].select_set(True)
+
+                # Add Decimate Modifier with ratio 0.5
+                bpy.ops.object.modifier_add(type='DECIMATE')
+                bpy.context.object.modifiers["Decimate"].ratio = 0.5
+
+# Function to be called on file save
+def on_save_handler(blenderdoc):
+    if 'gltf_file' not in data:
+        gltf_file = bpy.data.filepath.replace('.blend','.glb')
+    else:
+        gltf_file = data['gltf_file']
+    
+    add_decimate_modifier_to_objects()
+    
+    # Export to glTF with specified settings and apply modifiers
+    bpy.ops.export_scene.gltf(
+        filepath=gltf_file,
+        export_format='GLB',
+        export_extras=True,
+        export_lights=True,
+        export_apply=True,
+        export_force_sampling=False,
+    )
+    notify(os.path.basename(gltf_file),"OK export")
+
+# Register the handler
+bpy.app.handlers.save_post.clear()
+bpy.app.handlers.save_post.append(on_save_handler)
+print("sourced gltf_export_on_save")