Don't send bone positions that are at rest

This reduces the required bandwidth by about 30%.

Scenes/sync_controller.gd

@@ -119,7 +119,7 @@ func sync_model_animation(
 	# 256 bones (and blendshapes) should be enough, right?
 	for i in stream.read_uint8():
 		var lookup := stream.read_uint8()
-		all_bones[lookup].pose = stream.read_bone_pose()
+		all_bones[lookup].pose = stream.read_bone_pose(all_bones[lookup].pose)
 	for i in stream.read_uint8():
 		var lookup := stream.read_uint8()
 		all_blendshapes[lookup].value = stream.read_range16()
@@ -157,7 +157,7 @@ static func send_model_animation(module: copyMultiplayer) -> void:
 		var bone_pose := skeleton.get_bone_pose(bone_idx)
 		var bone_rest := skeleton.get_bone_rest(bone_idx)
 		if not bone_pose.is_equal_approx(bone_rest):
-			restless_bones.append({ lookup = i, pose = bone_pose })
+			restless_bones.append({ lookup = i, pose = bone_pose, rest = bone_rest })
 
 	for i in module.blendshape_lookup.size():
 		var anim_path := module.blendshape_lookup[i]
@@ -169,7 +169,7 @@ static func send_model_animation(module: copyMultiplayer) -> void:
 	write_stream.write_uint8(restless_bones.size())
 	for bone in restless_bones:
 		write_stream.write_uint8(bone.lookup)
-		write_stream.write_bone_pose(bone.pose)
+		write_stream.write_bone_pose(bone.pose, bone.rest)
 
 	write_stream.write_uint8(active_blendshapes.size())
 	for blendshape in active_blendshapes:

Utility/stream_buffer.gd

@@ -155,11 +155,11 @@ func read_string() -> String:
 
 # Optimized way to write a bone transform, since bones are likely to not contain offset or scale.
 
-func write_bone_pose(value: Transform3D) -> void:
-	var pos   := value.origin
-	var rot   := value.basis.get_euler()
-	var scale := value.basis.get_scale()
-	var has_pos    := !pos.is_zero_approx()
+func write_bone_pose(pose: Transform3D, rest: Transform3D) -> void:
+	var pos   := pose.origin
+	var rot   := pose.basis.get_euler()
+	var scale := pose.basis.get_scale()
+	var has_pos    := !pos.is_equal_approx(rest.origin)
 	var has_rot    := !rot.is_zero_approx()
 	var has_scale  := !scale.is_equal_approx(Vector3.ONE)
 	var has_scale3 := !is_equal_approx(scale.x, scale.y) or !is_equal_approx(scale.x, scale.y)
@@ -169,7 +169,7 @@ func write_bone_pose(value: Transform3D) -> void:
 	if has_scale3: write_vector16(scale)
 	elif has_scale: write_float16((scale.x + scale.y + scale.z) / 3)
 
-func read_bone_pose() -> Transform3D:
+func read_bone_pose(rest: Transform3D) -> Transform3D:
 	var pos   := Vector3.ZERO
 	var rot   := Vector3.ZERO
 	var scale := Vector3.ONE
@@ -177,7 +177,7 @@ func read_bone_pose() -> Transform3D:
 	var has_rot    := read_bit()
 	var has_scale  := read_bit()
 	var has_scale3 := read_bit()
-	if has_pos: pos = read_vector16()
+	pos = read_vector16() if has_pos else rest.origin
 	if has_rot: rot = Vector3(read_range16() * TAU, read_range16() * TAU, read_range16() * TAU)
 	if has_scale3: scale = read_vector16()
 	elif has_scale: var s := read_float16(); scale = Vector3(s, s, s)