GODOT IS OPEN SOURCE

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diff --git a/scene/resources/surface_tool.h b/scene/resources/surface_tool.h
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+/*************************************************************************/
+/*  surface_tool.h                                                       */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                    http://www.godotengine.org                         */
+/*************************************************************************/
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                 */
+/*                                                                       */
+/* 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 SURFACE_TOOL_H
+#define SURFACE_TOOL_H
+
+#include "scene/resources/mesh.h"
+
+
+
+class SurfaceTool : public Reference {
+
+	OBJ_TYPE(SurfaceTool, Reference );
+public:
+	struct Vertex {
+
+			Vector3 vertex;
+			Color color;
+			Vector3 normal; // normal, binormal, tangent
+			Vector3 binormal;
+			Vector3 tangent;
+			Vector2 uv;
+			Vector2 uv2;
+			Vector<int> bones;
+			Vector<float> weights;
+
+			Vertex() {  }
+	};
+
+
+private:
+	bool compare(const Vertex& p_a,const Vertex& p_b) const;
+
+	bool begun;
+	bool first;
+	Mesh::PrimitiveType primitive;
+	int format;
+	Ref<Material> material;
+	//arrays
+	List< Vertex > vertex_array;
+	List< int > index_array;
+
+	//memory
+	Color last_color;
+	Vector3 last_normal;
+	Vector2 last_uv;
+	Vector2 last_uv2;
+	Vector<int> last_bones;
+	Vector<float> last_weights;
+	Plane last_tangent;
+
+	void _create_list(const Ref<Mesh>& p_existing, int p_surface, List<Vertex> *r_vertex, List<int> *r_index,int &lformat);
+
+protected:
+
+	static void _bind_methods();
+
+public:
+
+	void begin(Mesh::PrimitiveType p_primitive);
+
+	void add_vertex( const Vector3& p_vertex);
+	void add_color( Color p_color );
+	void add_normal( const Vector3& p_normal);
+	void add_tangent( const Plane& p_tangent );
+	void add_uv( const Vector2& p_uv);
+	void add_uv2( const Vector2& p_uv);
+	void add_bones( const Vector<int>& p_indices);
+	void add_weights( const Vector<float>& p_weights);
+
+	void add_index( int p_index);
+
+	void index();
+	void deindex();
+	void generate_flat_normals();
+	void generate_smooth_normals();
+	void generate_tangents();
+
+	void add_to_format(int p_flags) { format|=p_flags; }
+
+	void set_material(const Ref<Material>& p_material);
+
+	void clear();
+
+	List< Vertex > &get_vertex_array() { return vertex_array; }
+
+	void create_from(const Ref<Mesh>& p_existing, int p_surface);
+	void append_from(const Ref<Mesh>& p_existing, int p_surface,const Transform& p_xform);
+	Ref<Mesh> commit(const Ref<Mesh>& p_existing=Ref<Mesh>());
+
+	SurfaceTool();
+};
+
+
+#endif