FLUKA: 8.2.4.15} Pyramid parallel to a coordinate axis. Code: PYX, PYY, PYZ Previous Index Next

# 8.2.4.15} Pyramid parallel to a coordinate axis. Code: PYX, PYY, PYZ

```      A PYX (PYY, PYZ)  is a pyramid  parallel to the x (y, z) axis.
It Can be full or truncated
Each  PYX (PYY, PYZ)  is defined by 7 parameters:
V_x, V_y, V_z, (coordinates of the centre of the major base)
L_y, L_z (res.p L_z, L_x or L_x, L_y) half-lengths of the sides
of the major base
H : height of the pyramid. The sign gives the direction from major
to minor basis
R : ratio between the sides of the minor base and the sides of the
major base. If R=0.0, the pyramid is not truncated.
R>=1. is not accepted
Example
PYZ body3        0.0   0.5   -10.0   +20.0  +40.0  50.0 0.8
Is a truncated pyramid with  major base centered at
0.0, 0.5,-10.0 and  extending from x=-20.0 to x=+20, and from
y=-39.5 to y=40.5. Its axis is along z, its height is 50 cm,
the minor basis extends from -16.0 to +16.0 in x and from
-31.5 to 32.5 in y

NOTE
+---------------------------------------------------------------------+
| Whenever it is possible, the following bodies should be preferred:  |
|     PLA, PYX, PYY, PYZ, QUA, RPP, SPH, XCC, XEC, XYP, XZP, YCC,     |
|                    YEC, YZP, ZCC, ZEC                               |
| These should indeed make tracking faster, since for them extra      |
| coding ensures that unnecessary boundary intersection calculations  |
| are avoided when the length of the next step is smaller than the    |
| distance to any boundary of the current region.                     |
+---------------------------------------------------------------------+

```