[vtkusers] Create an actual mesh from a set of "connected" triangles

[Bryn Lloyd]

> 
> Thanks much! How did you figure that out?? I can easily remove duplicate 
> points and triangles in my code.

I expanded the model by warping the surface in the normal direction, i.e.:

1. generate normals (triangle splitting off)

2. warp (vectors)

The mentioned triangles at the top fin of the dolphin do not "expand" or 
"blow up" since they share all three nodes.


> 
> What do you mean by tetgen?
> 

google "tetgen"