Purpose:
Demonstrates how to generate a tet mesh:
(either 'ng_vol' from the netgen pakage or tetgen (comes with cgx code)
must be available)

either use the vda2fbd converter or use the available fbd file
(vda2fbd halter.vda > halter.fbd)
or use the cad2fbd converter for the conversion of the step or iges files

use -a for automatic mode, do not use -b!:
cgx -a halter.fbd

# generate and export a tet mesh, type:
body ! all
elty all te10
asgn netgen   # Remark: default mesher tetgen generates some elements with
              # negative jacobian.
mesh all
send all abq
(zap -NJBY)     # If tetgen was used, delete flat surface elements


# or do first a surface meshing with manipulations and separate tet-meshing:
elty all
elty all tr6u
mesh all
(use 'qmsh' for mesh-adjustments)
mesh all tet
(optionally use 'mesh all tet 4.' were '4.' is the target-size for the tet-
 elements)
