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diff --git a/extern/bullet/Extras/PhysicsInterface/Common/PHY_Pro.h b/extern/bullet/Extras/PhysicsInterface/Common/PHY_Pro.h
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+/*
+ * Copyright (c) 2001-2005 Erwin Coumans <phy@erwincoumans.com>
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Erwin Coumans makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ */
+
+#ifndef PHY_PROPSH
+#define PHY_PROPSH
+
+
+class CollisionShape;
+
+// Properties of dynamic objects
+struct PHY_ShapeProps {
+	float  m_mass;                  // Total mass
+	float  m_inertia;               // Inertia, should be a tensor some time 
+	float  m_lin_drag;              // Linear drag (air, water) 0 = concrete, 1 = vacuum 
+	float  m_ang_drag;              // Angular drag
+	float  m_friction_scaling[3];   // Scaling for anisotropic friction. Component in range [0, 1]   
+	bool       m_do_anisotropic;        // Should I do anisotropic friction? 
+	bool       m_do_fh;                 // Should the object have a linear Fh spring?
+	bool       m_do_rot_fh;             // Should the object have an angular Fh spring?
+	CollisionShape*	m_shape;
+};
+
+
+// Properties of collidable objects (non-ghost objects)
+struct PHY_MaterialProps {
+	float m_restitution;           // restitution of energie after a collision 0 = inelastic, 1 = elastic
+	float m_friction;              // Coulomb friction (= ratio between the normal en maximum friction force)
+	float m_fh_spring;             // Spring constant (both linear and angular)
+	float m_fh_damping;            // Damping factor (linear and angular) in range [0, 1]
+	float m_fh_distance;           // The range above the surface where Fh is active.    
+	bool      m_fh_normal;             // Should the object slide off slopes?
+};
+
+#endif //PHY_PROPSH
+