Ipointcollection act as a volume

Discussion created by sercanmetu on Oct 3, 2011
I have two point collection as seen in the figure. However , when i ask if this two geometries intersect esri says no. But geometry2 is inside the geometry1 , it must intersect. My problem is geometry1 is not seen as i volume. How can i say esri that this geometry is a volume?

IRelationalOperator3D relationalOperator3D = geometry1 as IRelationalOperator3D;
bool intersect = !(relationalOperator3D.Disjoint3D(geometry2));
Console.WriteLine("intersect: " + intersect);
//output is false however it must be true

Thanks in advance.