public unsafe static void RefreshContactPoints(this PersistentManifold obj, ref OpenTK.Matrix4 trA, ref OpenTK.Matrix4 trB)
 {
     fixed(OpenTK.Matrix4 *trAPtr = &trA)
     {
         fixed(OpenTK.Matrix4 *trBPtr = &trB)
         {
             obj.RefreshContactPoints(ref *(BulletSharp.Math.Matrix *)trAPtr, ref *(BulletSharp.Math.Matrix *)trBPtr);
         }
     }
 }