io_scene_fbx/__init__.py

@@ -5,7 +5,7 @@
 bl_info = {
     "name": "FBX format",
     "author": "Campbell Barton, Bastien Montagne, Jens Restemeier, @Mysteryem",
-    "version": (5, 7, 4),
+    "version": (5, 7, 5),
     "blender": (3, 6, 0),
     "location": "File > Import-Export",
     "description": "FBX IO meshes, UVs, vertex colors, materials, textures, cameras, lamps and actions",

io_scene_fbx/export_fbx_bin.py

@@ -1981,12 +1981,6 @@ def fbx_data_animation_elements(root, scene_data):
     animations = scene_data.animations
     if not animations:
         return
-    scene = scene_data.scene
-
-    fps = scene.render.fps / scene.render.fps_base
-
-    def keys_to_ktimes(keys):
-        return (int(v) for v in convert_sec_to_ktime_iter((f / fps for f, _v in keys)))
 
     # Animation stacks.
     for astack_key, alayers, alayer_key, name, f_start, f_end in animations:
@@ -2026,18 +2020,18 @@ def fbx_data_animation_elements(root, scene_data):
                 acn_tmpl = elem_props_template_init(scene_data.templates, b"AnimationCurveNode")
                 acn_props = elem_properties(acurvenode)
 
-                for fbx_item, (acurve_key, def_value, keys, _acurve_valid) in acurves.items():
+                for fbx_item, (acurve_key, def_value, (keys, values), _acurve_valid) in acurves.items():
                     elem_props_template_set(acn_tmpl, acn_props, "p_number", fbx_item.encode(),
                                             def_value, animatable=True)
 
                     # Only create Animation curve if needed!
-                    if keys:
+                    nbr_keys = len(keys)
+                    if nbr_keys:
                         acurve = elem_data_single_int64(root, b"AnimationCurve", get_fbx_uuid_from_key(acurve_key))
                         acurve.add_string(fbx_name_class(b"", b"AnimCurve"))
                         acurve.add_string(b"")
 
                         # key attributes...
-                        nbr_keys = len(keys)
                         # flags...
                         keyattr_flags = (
                             1 << 2 |   # interpolation mode, 1 = constant, 2 = linear, 3 = cubic.
@@ -2052,8 +2046,8 @@ def fbx_data_animation_elements(root, scene_data):
                         # And now, the *real* data!
                         elem_data_single_float64(acurve, b"Default", def_value)
                         elem_data_single_int32(acurve, b"KeyVer", FBX_ANIM_KEY_VERSION)
-                        elem_data_single_int64_array(acurve, b"KeyTime", keys_to_ktimes(keys))
+                        elem_data_single_int64_array(acurve, b"KeyTime", astype_view_signedness(keys, np.int64))
-                        elem_data_single_float32_array(acurve, b"KeyValueFloat", (v for _f, v in keys))
+                        elem_data_single_float32_array(acurve, b"KeyValueFloat", values.astype(np.float32, copy=False))
                         elem_data_single_int32_array(acurve, b"KeyAttrFlags", keyattr_flags)
                         elem_data_single_float32_array(acurve, b"KeyAttrDataFloat", keyattr_datafloat)
                         elem_data_single_int32_array(acurve, b"KeyAttrRefCount", (nbr_keys,))
@@ -2254,42 +2248,121 @@ def fbx_animations_do(scene_data, ref_id, f_start, f_end, start_zero, objects=No
     dupli_parent_bdata = {dup.get_parent().bdata for dup in animdata_ob if dup.is_dupli}
     has_animated_duplis = bool(dupli_parent_bdata)
 
-    currframe = f_start
+    # Initialize keyframe times array. Each AnimationCurveNodeWrapper will share the same instance.
-    while currframe <= f_end:
+    # `np.arange` excludes the `stop` argument like when using `range`, so we use np.nextafter to get the next
-        real_currframe = currframe - f_start if start_zero else currframe
+    # representable value after f_end and use that as the `stop` argument instead.
-        scene.frame_set(int(currframe), subframe=currframe - int(currframe))
+    currframes = np.arange(f_start, np.nextafter(f_end, np.inf), step=bake_step)
+
+    # Convert from Blender time to FBX time.
+    fps = scene.render.fps / scene.render.fps_base
+    real_currframes = currframes - f_start if start_zero else currframes
+    real_currframes = (real_currframes / fps * FBX_KTIME).astype(np.int64)
+
+    # Generator that yields the animated values of each frame in order.
+    def frame_values_gen():
+        # Precalculate integer frames and subframes.
+        int_currframes = currframes.astype(int)
+        subframes = currframes - int_currframes
+
+        # Create simpler iterables that return only the values we care about.
+        animdata_shapes_only = [shape for _anim_shape, _me, shape in animdata_shapes.values()]
+        animdata_cameras_only = [camera for _anim_camera_lens, _anim_camera_focus_distance, camera
+                                 in animdata_cameras.values()]
+        # Previous frame's rotation for each object in animdata_ob, this will be updated each frame.
+        animdata_ob_p_rots = p_rots.values()
+
+        # Iterate through each frame and yield the values for that frame.
+        # Iterating .data, the memoryview of an array, is faster than iterating the array directly.
+        for int_currframe, subframe in zip(int_currframes.data, subframes.data):
+            scene.frame_set(int_currframe, subframe=subframe)
 
             if has_animated_duplis:
-            # Changing the scene's frame invalidates existing dupli instances. To get the updated matrices of duplis for
+                # Changing the scene's frame invalidates existing dupli instances. To get the updated matrices of duplis
-            # this frame, we must get the duplis from the depsgraph again.
+                # for this frame, we must get the duplis from the depsgraph again.
                 for dup in depsgraph.object_instances:
                     if (parent := dup.parent) and parent.original in dupli_parent_bdata:
                         # ObjectWrapper caches its instances. Attempting to create a new instance updates the existing
                         # ObjectWrapper instance with the current frame's matrix and then returns the existing instance.
                         ObjectWrapper(dup)
-        for ob_obj, (anim_loc, anim_rot, anim_scale) in animdata_ob.items():
+            next_p_rots = []
+            for ob_obj, p_rot in zip(animdata_ob, animdata_ob_p_rots):
                 # We compute baked loc/rot/scale for all objects (rot being euler-compat with previous value!).
-            p_rot = p_rots.get(ob_obj, None)
                 loc, rot, scale, _m, _mr = ob_obj.fbx_object_tx(scene_data, rot_euler_compat=p_rot)
-            p_rots[ob_obj] = rot
+                next_p_rots.append(rot)
-            anim_loc.add_keyframe(real_currframe, loc)
+                yield from loc
-            anim_rot.add_keyframe(real_currframe, tuple(convert_rad_to_deg_iter(rot)))
+                yield from rot
-            anim_scale.add_keyframe(real_currframe, scale)
+                yield from scale
-        for anim_shape, me, shape in animdata_shapes.values():
+            animdata_ob_p_rots = next_p_rots
-            anim_shape.add_keyframe(real_currframe, (shape.value * 100.0,))
+            for shape in animdata_shapes_only:
-        for anim_camera_lens, anim_camera_focus_distance, camera in animdata_cameras.values():
+                yield shape.value
-            anim_camera_lens.add_keyframe(real_currframe, (camera.lens,))
+            for camera in animdata_cameras_only:
-            anim_camera_focus_distance.add_keyframe(real_currframe, (camera.dof.focus_distance * 1000 * gscale,))
+                yield camera.lens
-        currframe += bake_step
+                yield camera.dof.focus_distance
 
+    # Providing `count` to np.fromiter pre-allocates the array, avoiding extra memory allocations while iterating.
+    num_ob_values = len(animdata_ob) * 9  # Location, rotation and scale, each of which have x, y, and z components
+    num_shape_values = len(animdata_shapes)  # Only 1 value per shape key
+    num_camera_values = len(animdata_cameras) * 2  # Focal length (`.lens`) and focus distance
+    num_values_per_frame = num_ob_values + num_shape_values + num_camera_values
+    num_frames = len(real_currframes)
+    all_values_flat = np.fromiter(frame_values_gen(), dtype=float, count=num_frames * num_values_per_frame)
+
+    # Restore the scene's current frame.
     scene.frame_set(back_currframe, subframe=0.0)
 
+    # View such that each column is all values for a single frame and each row is all values for a single curve.
+    all_values = all_values_flat.reshape(num_frames, num_values_per_frame).T
+    # Split into views of the arrays for each curve type.
+    split_at = [num_ob_values, num_shape_values, num_camera_values]
+    # For unequal sized splits, np.split takes indices to split at, which can be acquired through a cumulative sum
+    # across the list.
+    # The last value isn't needed, because the last split is assumed to go to the end of the array.
+    split_at = np.cumsum(split_at[:-1])
+    all_ob_values, all_shape_key_values, all_camera_values = np.split(all_values, split_at)
+
+    all_anims = []
+
+    # Set location/rotation/scale curves.
+    # Split into equal sized views of the arrays for each object.
+    split_into = len(animdata_ob)
+    per_ob_values = np.split(all_ob_values, split_into) if split_into > 0 else ()
+    for anims, ob_values in zip(animdata_ob.values(), per_ob_values):
+        # Split again into equal sized views of the location, rotation and scaling arrays.
+        loc_xyz, rot_xyz, sca_xyz = np.split(ob_values, 3)
+        # In-place convert from Blender rotation to FBX rotation.
+        np.rad2deg(rot_xyz, out=rot_xyz)
+
+        anim_loc, anim_rot, anim_scale = anims
+        anim_loc.set_keyframes(real_currframes, loc_xyz)
+        anim_rot.set_keyframes(real_currframes, rot_xyz)
+        anim_scale.set_keyframes(real_currframes, sca_xyz)
+        all_anims.extend(anims)
+
+    # Set shape key curves.
+    # There's only one array per shape key, so there's no need to split `all_shape_key_values`.
+    for (anim_shape, _me, _shape), shape_key_values in zip(animdata_shapes.values(), all_shape_key_values):
+        # In-place convert from Blender Shape Key Value to FBX Deform Percent.
+        shape_key_values *= 100.0
+        anim_shape.set_keyframes(real_currframes, shape_key_values)
+        all_anims.append(anim_shape)
+
+    # Set camera curves.
+    # Split into equal sized views of the arrays for each camera.
+    split_into = len(animdata_cameras)
+    per_camera_values = np.split(all_camera_values, split_into) if split_into > 0 else ()
+    zipped = zip(animdata_cameras.values(), per_camera_values)
+    for (anim_camera_lens, anim_camera_focus_distance, _camera), (lens_values, focus_distance_values) in zipped:
+        # In-place convert from Blender focus distance to FBX.
+        focus_distance_values *= (1000 * gscale)
+        anim_camera_lens.set_keyframes(real_currframes, lens_values)
+        anim_camera_focus_distance.set_keyframes(real_currframes, focus_distance_values)
+        all_anims.append(anim_camera_lens)
+        all_anims.append(anim_camera_focus_distance)
+
     animations = {}
 
     # And now, produce final data (usable by FBX export code)
-    # Objects-like loc/rot/scale...
+    for anim in all_anims:
-    for ob_obj, anims in animdata_ob.items():
-        for anim in anims:
         anim.simplify(simplify_fac, bake_step, force_keep)
         if not anim:
             continue
@@ -2297,32 +2370,6 @@ def fbx_animations_do(scene_data, ref_id, f_start, f_end, start_zero, objects=No
             anim_data = animations.setdefault(obj_key, ("dummy_unused_key", {}))
             anim_data[1][fbx_group] = (group_key, group, fbx_gname)
 
-    # And meshes' shape keys.
-    for channel_key, (anim_shape, me, shape) in animdata_shapes.items():
-        final_keys = {}
-        anim_shape.simplify(simplify_fac, bake_step, force_keep)
-        if not anim_shape:
-            continue
-        for elem_key, group_key, group, fbx_group, fbx_gname in anim_shape.get_final_data(scene, ref_id, force_keep):
-            anim_data = animations.setdefault(elem_key, ("dummy_unused_key", {}))
-            anim_data[1][fbx_group] = (group_key, group, fbx_gname)
-
-    # And cameras' lens and focus distance keys.
-    for cam_key, (anim_camera_lens, anim_camera_focus_distance, camera) in animdata_cameras.items():
-        final_keys = {}
-        anim_camera_lens.simplify(simplify_fac, bake_step, force_keep)
-        anim_camera_focus_distance.simplify(simplify_fac, bake_step, force_keep)
-        if anim_camera_lens:
-            for elem_key, group_key, group, fbx_group, fbx_gname in \
-                    anim_camera_lens.get_final_data(scene, ref_id, force_keep):
-                anim_data = animations.setdefault(elem_key, ("dummy_unused_key", {}))
-                anim_data[1][fbx_group] = (group_key, group, fbx_gname)
-        if anim_camera_focus_distance:
-            for elem_key, group_key, group, fbx_group, fbx_gname in \
-                    anim_camera_focus_distance.get_final_data(scene, ref_id, force_keep):
-                anim_data = animations.setdefault(elem_key, ("dummy_unused_key", {}))
-                anim_data[1][fbx_group] = (group_key, group, fbx_gname)
-
     astack_key = get_blender_anim_stack_key(scene, ref_id)
     alayer_key = get_blender_anim_layer_key(scene, ref_id)
     name = (get_blenderID_name(ref_id) if ref_id else scene.name).encode()
@@ -2848,8 +2895,8 @@ def fbx_data_from_scene(scene, depsgraph, settings):
             for _alayer_key, alayer in astack.values():
                 for _acnode_key, acnode, _acnode_name in alayer.values():
                     nbr_acnodes += 1
-                    for _acurve_key, _dval, acurve, acurve_valid in acnode.values():
+                    for _acurve_key, _dval, (keys, _values), acurve_valid in acnode.values():
-                        if acurve:
+                        if len(keys):
                             nbr_acurves += 1
 
         templates[b"AnimationStack"] = fbx_template_def_animstack(scene, settings, nbr_users=nbr_astacks)
@@ -2983,8 +3030,8 @@ def fbx_data_from_scene(scene, depsgraph, settings):
                 connections.append((b"OO", acurvenode_id, alayer_id, None))
                 # Animcurvenode -> object property.
                 connections.append((b"OP", acurvenode_id, elem_id, fbx_prop.encode()))
-                for fbx_item, (acurve_key, default_value, acurve, acurve_valid) in acurves.items():
+                for fbx_item, (acurve_key, default_value, (keys, values), acurve_valid) in acurves.items():
-                    if acurve:
+                    if len(keys):
                         # Animcurve -> Animcurvenode.
                         connections.append((b"OP", get_fbx_uuid_from_key(acurve_key), acurvenode_id, fbx_item.encode()))
 

io_scene_fbx/fbx_utils.py

@@ -1234,8 +1234,10 @@ class AnimationCurveNodeWrapper:
     and easy API to handle those.
     """
     __slots__ = (
-        'elem_keys', '_keys', 'default_values', 'fbx_group', 'fbx_gname', 'fbx_props',
+        'elem_keys', 'default_values', 'fbx_group', 'fbx_gname', 'fbx_props',
-        'force_keying', 'force_startend_keying')
+        'force_keying', 'force_startend_keying',
+        '_frame_times_array', '_frame_values_array', '_frame_write_mask_array',
+    )
 
     kinds = {
         'LCL_TRANSLATION': ("Lcl Translation", "T", ("X", "Y", "Z")),
@@ -1254,7 +1256,9 @@ class AnimationCurveNodeWrapper:
         self.fbx_props = [self.kinds[kind][2]]
         self.force_keying = force_keying
         self.force_startend_keying = force_startend_keying
-        self._keys = []  # (frame, values, write_flags)
+        self._frame_times_array = None
+        self._frame_values_array = None
+        self._frame_write_mask_array = None
         if default_values is not ...:
             assert(len(default_values) == len(self.fbx_props[0]))
             self.default_values = default_values
@@ -1263,7 +1267,7 @@ class AnimationCurveNodeWrapper:
 
     def __bool__(self):
         # We are 'True' if we do have some validated keyframes...
-        return bool(self._keys) and (True in ((True in k[2]) for k in self._keys))
+        return self._frame_write_mask_array is not None and bool(np.any(self._frame_write_mask_array))
 
     def add_group(self, elem_key, fbx_group, fbx_gname, fbx_props):
         """
@@ -1276,19 +1280,31 @@ class AnimationCurveNodeWrapper:
         self.fbx_gname.append(fbx_gname)
         self.fbx_props.append(fbx_props)
 
-    def add_keyframe(self, frame, values):
+    def set_keyframes(self, keyframe_times, keyframe_values):
         """
-        Add a new keyframe to all curves of the group.
+        Set all keyframe times and values of the group.
+        Values can be a 2D array where each row is the values for a separate curve.
         """
-        assert(len(values) == len(self.fbx_props[0]))
+        # View 1D keyframe_values as 2D with a single row, so that the same code can be used for both 1D and
-        self._keys.append((frame, values, [True] * len(values)))  # write everything by default.
+        # 2D inputs.
+        if len(keyframe_values.shape) == 1:
+            keyframe_values = keyframe_values[np.newaxis]
+        # There must be a time for each column of values.
+        assert(len(keyframe_times) == keyframe_values.shape[1])
+        # There must be as many rows of values as there are properties.
+        assert(len(self.fbx_props[0]) == len(keyframe_values))
+        write_mask = np.full_like(keyframe_values, True, dtype=bool)  # write everything by default
+        self._frame_times_array = keyframe_times
+        self._frame_values_array = keyframe_values
+        self._frame_write_mask_array = write_mask
 
     def simplify(self, fac, step, force_keep=False):
         """
         Simplifies sampled curves by only enabling samples when:
             * their values relatively differ from the previous sample ones.
         """
-        if not self._keys:
+        if self._frame_times_array is None:
+            # Keyframes have not been added yet.
             return
 
         if fac == 0.0:
@@ -1297,15 +1313,22 @@ class AnimationCurveNodeWrapper:
         # So that, with default factor and step values (1), we get:
         min_reldiff_fac = fac * 1.0e-3  # min relative value evolution: 0.1% of current 'order of magnitude'.
         min_absdiff_fac = 0.1  # A tenth of reldiff...
-        keys = self._keys
 
-        p_currframe, p_key, p_key_write = keys[0]
+        are_keyed = []
-        p_keyed = list(p_key)
+        for values, frame_write_mask in zip(self._frame_values_array, self._frame_write_mask_array):
-        are_keyed = [False] * len(p_key)
+            # Initialise to no frames written.
-        for currframe, key, key_write in keys:
+            frame_write_mask[:] = False
+
+            # Create views of the 'previous' and 'current' mask and values. The memoryview, .data, of each array is used
+            # for its iteration and indexing performance compared to the array.
+            key = values[1:].data
+            p_key = values[:-1].data
+            key_write = frame_write_mask[1:].data
+            p_key_write = frame_write_mask[:-1].data
+
+            p_keyedval = values[0]
+            is_keyed = False
             for idx, (val, p_val) in enumerate(zip(key, p_key)):
-                key_write[idx] = False
-                p_keyedval = p_keyed[idx]
                 if val == p_val:
                     # Never write keyframe when value is exactly the same as prev one!
                     continue
@@ -1319,14 +1342,14 @@ class AnimationCurveNodeWrapper:
                     # If enough difference from previous sampled value, key this value *and* the previous one!
                     key_write[idx] = True
                     p_key_write[idx] = True
-                    p_keyed[idx] = val
+                    p_keyedval = val
-                    are_keyed[idx] = True
+                    is_keyed = True
                 elif abs(val - p_keyedval) > (min_reldiff_fac * max((abs(val) + abs(p_keyedval)), min_absdiff_fac)):
                     # Else, if enough difference from previous keyed value, key this value only!
                     key_write[idx] = True
-                    p_keyed[idx] = val
+                    p_keyedval = val
-                    are_keyed[idx] = True
+                    is_keyed = True
-            p_currframe, p_key, p_key_write = currframe, key, key_write
+            are_keyed.append(is_keyed)
 
         # If we write nothing (action doing nothing) and are in 'force_keep' mode, we key everything! :P
         # See T41766.
@@ -1339,20 +1362,20 @@ class AnimationCurveNodeWrapper:
 
         # If we did key something, ensure first and last sampled values are keyed as well.
         if self.force_startend_keying:
-            for idx, is_keyed in enumerate(are_keyed):
+            for is_keyed, frame_write_mask in zip(are_keyed, self._frame_write_mask_array):
                 if is_keyed:
-                    keys[0][2][idx] = keys[-1][2][idx] = True
+                    frame_write_mask[:1] = True
+                    frame_write_mask[-1:] = True
 
     def get_final_data(self, scene, ref_id, force_keep=False):
         """
         Yield final anim data for this 'curvenode' (for all curvenodes defined).
         force_keep is to force to keep a curve even if it only has one valid keyframe.
         """
-        curves = [[] for k in self._keys[0][1]]
+        curves = [
-        for currframe, key, key_write in self._keys:
+            (self._frame_times_array[write_mask], values[write_mask])
-            for curve, val, wrt in zip(curves, key, key_write):
+            for values, write_mask in zip(self._frame_values_array, self._frame_write_mask_array)
-                if wrt:
+        ]
-                    curve.append((currframe, val))
 
         force_keep = force_keep or self.force_keying
         for elem_key, fbx_group, fbx_gname, fbx_props in \
@@ -1363,8 +1386,9 @@ class AnimationCurveNodeWrapper:
                 fbx_item = FBX_ANIM_PROPSGROUP_NAME + "|" + fbx_item
                 curve_key = get_blender_anim_curve_key(scene, ref_id, elem_key, fbx_group, fbx_item)
                 # (curve key, default value, keyframes, write flag).
-                group[fbx_item] = (curve_key, def_val, c,
+                times = c[0]
-                                   True if (len(c) > 1 or (len(c) > 0 and force_keep)) else False)
+                write_flag = len(times) > (0 if force_keep else 1)
+                group[fbx_item] = (curve_key, def_val, c, write_flag)
             yield elem_key, group_key, group, fbx_group, fbx_gname