converter: Add option to save animations to separate files

This is can be accessed via the CLI using `--animations separate`

gltf/cli.py

@@ -62,6 +62,17 @@ def main():
         help='convert imported PBR materials to legacy materials'
     )
 
+    parser.add_argument(
+        '--animations',
+        choices=[
+            'embed',
+            'separate',
+            'skip',
+        ],
+        default='embed',
+        help='control what to do with animation data'
+    )
+
     args = parser.parse_args()
 
     settings = gltf.GltfSettings(
@@ -71,6 +82,7 @@ def main():
         no_srgb=args.no_srgb,
         textures=args.textures,
         legacy_materials=args.legacy_materials,
+        animations=args.animations
     )
 
     gltf.converter.convert(args.src, args.dst, settings)

gltf/converter.py

@@ -36,6 +36,7 @@
     'no_srgb',
     'textures',
     'legacy_materials',
+    'animations',
 ))
 GltfSettings.__new__.__defaults__ = (
     'builtin', # physics engine
@@ -44,6 +45,7 @@
     False, # do not load textures as sRGB
     'ref', # reference external textures
     False, # use PBR materials
+    'embed', # keep animations in the same BAM file
 )
 
 
@@ -1054,11 +1056,14 @@ def build_character(self, char, nodeid, jvtmap, cvsmap, gltf_data, recurse=True)
 
         # Find animations that affect the collected nodes.
         #print("Looking for actions for", skinname, node_ids)
-        anims = [
-            (animid, anim)
-            for animid, anim in enumerate(gltf_data.get('animations', []))
-            if affected_nodeids & {chan['target']['node'] for chan in anim['channels']}
-        ]
+        if self.settings.animations != 'skip':
+            anims = [
+                (animid, anim)
+                for animid, anim in enumerate(gltf_data.get('animations', []))
+                if affected_nodeids & {chan['target']['node'] for chan in anim['channels']}
+            ]
+        else:
+            anims = []
 
         for animid, gltf_anim in anims:
             anim_name = gltf_anim.get('name', 'anim'+str(animid))
@@ -1711,6 +1716,13 @@ def convert(src, dst, settings=None):
     if settings.print_scene:
         converter.active_scene.ls()
 
+    if settings.animations == 'separate':
+        for bundlenode in converter.active_scene.find_all_matches('**/+AnimBundleNode'):
+            anim_name = bundlenode.node().bundle.name
+            anim_dst = dst.get_fullpath_wo_extension() \
+                + f'_{anim_name}.' \
+                + dst.get_extension()
+            bundlenode.write_bam_file(anim_dst)
     converter.active_scene.write_bam_file(dst)