move static globals inside static member functions, to avoid hassle with C#/CLI/C++ managed code, compile error C3820

src/BulletDynamics/Dynamics/btActionInterface.h

@@ -20,11 +20,21 @@ class btIDebugDraw;
 class btCollisionWorld;
 
 #include "LinearMath/btScalar.h"
+#include "btRigidBody.h"
 
 ///Basic interface to allow actions such as vehicles and characters to be updated inside a btDynamicsWorld
 class btActionInterface
 {
-	public:
+protected:
+
+	static btRigidBody& getFixedBody()
+	{
+		static btRigidBody s_fixed(0, 0,0);
+		s_fixed.setMassProps(btScalar(0.),btVector3(btScalar(0.),btScalar(0.),btScalar(0.)));
+		return s_fixed;
+	}	
+	
+public:
 
 	virtual ~btActionInterface()
 	{