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2.2.8} Assigning materials to regions

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 A material must be associated to each of the geometry regions, except to
 those defined as blackhole. This is done in a very straightforward way by
 command ASSIGNMAt. Assigning explicitly blackhole to a region is allowed, but
 is not necessary (except for region 2) because a region is blackhole by
 default unless another material has been associated to it. (Region 2, if not
 assigned a material, is COPPER by default).  The table entitled "Regions:
 materials and fields", in the standard output, can be consulted to check that
 material assignment has been done as desired.

 For the present example the assignment could be:
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
* Be target, 1st and 2nd half
ASSIGNMAT 5.0 3.0 4.0
* External Black Hole
ASSIGNMAT 1.0 1.0
* Vacuum
ASSIGNMAT 2.0 2.0 The same material assignments in a name-based input would be the following (BLCKHOLE and VACUUM are the predefined names of material 1 and 2):
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
* Be target, 1st and 2nd half
ASSIGNMAT BERYLLIU UpstrBe DwnstrBe
* External Black Hole
ASSIGNMAT BLCKHOLE Blckhole
* Vacuum
ASSIGNMAT VACUUM Vacarund

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