Odd shaped boundary cells

[David J Brockley]

Hi

I'm starting work on a visualisation project that involves cell centred
data on a refined mesh. The mesh is hexahedral with some global cells
containing multiple refined cells. The data on the mesh is cell centred.

My problem is that some of the cells are cut by n planes that form an
arbitrary shaped boundary about the mesh. I need to slice the mesh and
produce flat shaded regions that cut off correctly where these planes
intersect the cut plane.

I'm looking at:

Deriving from Cell to produce a hexahedral cell modified by a list of
cut planes, or
Writing an algorithm to decompose cut cells into a collection of
hexahedrons and tetrahedrons.

Any opinions, comments, or crys of 'that's really easy' will be welcome
as I am new to VTK.

David J Brockley
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