public void OnBuildMeshToEnter(ViewPointMeshBuilder meshBuilder)
 {
     if (meshBuilder.enterDefaultVertexOnStart) {
         ActivateViewPointMeshVertex(meshBuilder.GetDefaultVertex());
     }
 }
 public ViewPointMeshVertex ClosestMatch(ViewPointMeshBuilder builder)
 {
     return builder.ClosestMatch(this);
 }