public unsafe static void TestLimit(this HingeConstraint obj, ref OpenTK.Matrix4 transA, ref OpenTK.Matrix4 transB)
 {
     fixed(OpenTK.Matrix4 *transAPtr = &transA)
     {
         fixed(OpenTK.Matrix4 *transBPtr = &transB)
         {
             obj.TestLimit(ref *(BulletSharp.Math.Matrix *)transAPtr, ref *(BulletSharp.Math.Matrix *)transBPtr);
         }
     }
 }