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diff --git a/scene/resources/skeleton_modification_3d.h b/scene/resources/skeleton_modification_3d.h
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+++ b/scene/resources/skeleton_modification_3d.h
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+/*************************************************************************/
+/*  skeleton_modification_3d.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 SKELETONMODIFICATION3D_H
+#define SKELETONMODIFICATION3D_H
+
+#include "scene/3d/skeleton_3d.h"
+#include "scene/resources/skeleton_modification_stack_3d.h"
+
+class SkeletonModificationStack3D;
+
+class SkeletonModification3D : public Resource {
+	GDCLASS(SkeletonModification3D, Resource);
+	friend class Skeleton3D;
+	friend class SkeletonModificationStack3D;
+
+protected:
+	static void _bind_methods();
+
+	SkeletonModificationStack3D *stack;
+	int execution_mode = 0; // 0 = process
+
+	bool enabled = true;
+	bool is_setup = false;
+	bool execution_error_found = false;
+
+	bool _print_execution_error(bool p_condition, String p_message);
+
+	GDVIRTUAL1(_execute, double)
+	GDVIRTUAL1(_setup_modification, Ref<SkeletonModificationStack3D>)
+
+public:
+	virtual void _execute(real_t p_delta);
+	virtual void _setup_modification(SkeletonModificationStack3D *p_stack);
+
+	real_t clamp_angle(real_t p_angle, real_t p_min_bound, real_t p_max_bound, bool p_invert);
+
+	void set_enabled(bool p_enabled);
+	bool get_enabled();
+
+	void set_execution_mode(int p_mode);
+	int get_execution_mode() const;
+
+	Ref<SkeletonModificationStack3D> get_modification_stack();
+
+	void set_is_setup(bool p_setup);
+	bool get_is_setup() const;
+
+	SkeletonModification3D();
+};
+
+#endif // SKELETONMODIFICATION3D_H