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diff --git a/source/blender/blenkernel/BKE_rigidbody.h b/source/blender/blenkernel/BKE_rigidbody.h
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+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2013 Blender Foundation
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): Joshua Leung, Sergej Reich
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file BKE_rigidbody.h
+ *  \ingroup blenkernel
+ *  \brief API for Blender-side Rigid Body stuff
+ */
+ 
+
+#ifndef __BKE_RIGIDBODY_H__
+#define __BKE_RIGIDBODY_H__
+
+struct RigidBodyWorld;
+struct RigidBodyOb;
+
+struct Scene;
+struct Object;
+struct Group;
+
+/* -------------- */
+/* Memory Management */
+
+void BKE_rigidbody_free_world(struct RigidBodyWorld *rbw);
+void BKE_rigidbody_free_object(struct Object *ob);
+void BKE_rigidbody_free_constraint(struct Object *ob);
+
+/* ...... */
+
+struct RigidBodyOb *BKE_rigidbody_copy_object(struct Object *ob);
+struct RigidBodyCon *BKE_rigidbody_copy_constraint(struct Object *ob);
+
+/* -------------- */
+/* Setup */
+
+/* create Blender-side settings data - physics objects not initialised yet */
+struct RigidBodyWorld *BKE_rigidbody_create_world(struct Scene *scene);
+struct RigidBodyOb *BKE_rigidbody_create_object(struct Scene *scene, struct Object *ob, short type);
+struct RigidBodyCon *BKE_rigidbody_create_constraint(struct Scene *scene, struct Object *ob, short type);
+
+/* 'validate' (i.e. make new or replace old) Physics-Engine objects */
+void BKE_rigidbody_validate_sim_world(struct Scene *scene, struct RigidBodyWorld *rbw, short rebuild);
+void BKE_rigidbody_validate_sim_object(struct RigidBodyWorld *rbw, struct Object *ob, short rebuild);
+void BKE_rigidbody_validate_sim_shape(struct Object *ob, short rebuild);
+void BKE_rigidbody_validate_sim_constraint(struct RigidBodyWorld *rbw, struct Object *ob, short rebuild);
+
+/* -------------- */
+/* Utilities */
+
+struct RigidBodyWorld *BKE_rigidbody_get_world(struct Scene *scene);
+void BKE_rigidbody_remove_object(struct Scene *scene, struct Object *ob);
+void BKE_rigidbody_remove_constraint(struct Scene *scene, struct Object *ob);
+
+/* -------------- */
+/* Utility Macros */
+
+/* get mass of Rigid Body Object to supply to RigidBody simulators */
+#define RBO_GET_MASS(rbo) \
+	((rbo && ((rbo->type == RBO_TYPE_PASSIVE) || (rbo->flag & RBO_FLAG_KINEMATIC) || (rbo->flag & RBO_FLAG_DISABLED))) ? (0.0f) : (rbo->mass))
+/* get collision margin for Rigid Body Object, triangle mesh and cone shapes cannot embed margin, convex hull always uses custom margin */
+#define RBO_GET_MARGIN(rbo) \
+	((rbo->flag & RBO_FLAG_USE_MARGIN || rbo->shape == RB_SHAPE_CONVEXH || rbo->shape == RB_SHAPE_TRIMESH || rbo->shape == RB_SHAPE_CONE) ? (rbo->margin) : (0.04f))
+
+/* -------------- */
+/* Simulation */
+
+void BKE_rigidbody_sync_transforms(struct Scene *scene, struct Object *ob, float ctime);
+void BKE_rigidbody_cache_reset(struct RigidBodyWorld *rbw);
+void BKE_rigidbody_do_simulation(struct Scene *scene, float ctime);
+
+#endif /* __BKE_RIGIDBODY_H__ */