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diff --git a/modules/fbx/data/fbx_bone.h b/modules/fbx/data/fbx_bone.h
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+/*************************************************************************/
+/*  fbx_bone.h                                                           */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef FBX_BONE_H
+#define FBX_BONE_H
+
+#include "fbx_node.h"
+#include "import_state.h"
+
+#include "fbx_parser/FBXDocument.h"
+
+struct PivotTransform;
+
+struct FBXBone : public Reference {
+	uint64_t parent_bone_id = 0;
+	uint64_t bone_id = 0;
+
+	bool valid_parent = false; // if the parent bone id is set up.
+	String bone_name = String(); // bone name
+
+	bool is_root_bone() const {
+		return !valid_parent;
+	}
+
+	// Godot specific data
+	int godot_bone_id = -2; // godot internal bone id assigned after import
+
+	// if a bone / armature is the root then FBX skeleton will contain the bone not any other skeleton.
+	// this is to support joints by themselves in scenes
+	bool valid_armature_id = false;
+	uint64_t armature_id = 0;
+
+	/* link node is the parent bone */
+	mutable const FBXDocParser::Geometry *geometry = nullptr;
+	mutable const FBXDocParser::ModelLimbNode *limb_node = nullptr;
+
+	void set_node(Ref<FBXNode> p_node) {
+		node = p_node;
+	}
+
+	// Stores the pivot xform for this bone
+
+	Ref<FBXNode> node = nullptr;
+	Ref<FBXBone> parent_bone = nullptr;
+	Ref<FBXSkeleton> fbx_skeleton = nullptr;
+};
+
+struct FBXSkinDeformer {
+	FBXSkinDeformer(Ref<FBXBone> p_bone, const FBXDocParser::Cluster *p_cluster) :
+			cluster(p_cluster), bone(p_bone) {}
+	~FBXSkinDeformer() {}
+	const FBXDocParser::Cluster *cluster;
+	Ref<FBXBone> bone;
+
+	/* get associate model - the model can be invalid sometimes */
+	Ref<FBXBone> get_associate_model() const {
+		return bone->parent_bone;
+	}
+
+	Ref<FBXNode> get_link(const ImportState &state) const;
+};
+
+#endif // FBX_BONE_H