[vtkusers] how to detect point that lies on an isosurface

[wingsneak]

I have now a program which using the vtk built in marching cubes algorithm,
generated two 3D rendered isosurfaces, from CT slices. one is a 3D model of
the human skull, the other is a 3D model of the human face (skin). 

i would like to mark a point on the skull, and my algorithm will then find
the corresponding point on the skin. since i used vtk to generate both the
skull and skin 3D rendered model in the same render window, this means that
both the skull and skin 3D model are registered to each other, am i correct?
please correct me if im wrong.

given that i have marked the corresponding point on the skull isosurface,
how does this point on the skull find its corresponding point on the skin
isosurface?



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