[vtkusers] Linear Extrusion

[Jaspar,Marc,TRENTON,Engineering]

Hi All

Extruding structural shapes (W, S, etc.).  From the point of origin on my
generating surface as well as on the terminal surface, triangular sheets are
generated to the extreme points of the shape. Moved the point of origin and
the triangular panels follow.  Wireframe view shows properly generate
surfaces.  
Tried with convex surfaces and the generation is correct. 

Anyone know a work around for concave surfaces?

M. Jaspar