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Commit | Line | Data |
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fe4da5cc | 1 | * |
2 | * $Id$ | |
3 | * | |
4 | * $Log$ | |
5 | * Revision 1.1.1.1 1995/10/24 10:20:03 cernlib | |
6 | * Geant | |
7 | * | |
8 | * | |
9 | #include "geant321/pilot.h" | |
10 | *CMZ : 3.21/02 29/03/94 15.41.44 by S.Giani | |
11 | *-- Author : | |
12 | *$ CREATE RACO.FOR | |
13 | *COPY RACO | |
14 | * | |
15 | *=== raco =============================================================* | |
16 | * | |
17 | SUBROUTINE RACO(WX,WY,WZ) | |
18 | #include "geant321/dblprc.inc" | |
19 | #include "geant321/dimpar.inc" | |
20 | #include "geant321/iounit.inc" | |
21 | REAL RNDM(2) | |
22 | C******************************************************************** | |
23 | C VERSION JUNE 81 BY PERTTI AARNIO | |
24 | C LAST CHANGE 22. JUNE 81 BY PERTTI AARNIO | |
25 | C HELSINKI UNIVERSITY OF | |
26 | C TECHNOLOGY, FINLAND | |
27 | C | |
28 | C | |
29 | C SUBROUTINE OF FLUKA TO GIVE THE DIRECTION COSINES OF RANDOM | |
30 | C UNIFORM (ISOTROPIC) DIRECTION IN THREE DIMENSIONAL SPACE. | |
31 | C******************************************************************** | |
32 | C | |
33 | 10 CALL GRNDM(RNDM,2) | |
34 | X=2.D0*RNDM(1)-1.D0 | |
35 | Y=RNDM(2) | |
36 | X2=X*X | |
37 | Y2=Y*Y | |
38 | IF (X2+Y2.GT.1.D0) GO TO 10 | |
39 | CFE=(X2-Y2)/(X2+Y2) | |
40 | SFE=2.D0*X*Y/(X2+Y2) | |
41 | CALL GRNDM(RNDM,1) | |
42 | Z=RNDM(1) | |
43 | Z2=Z*Z | |
44 | WZ=SQRT(Z-Z2) | |
45 | WX=2.D0*WZ*CFE | |
46 | WY=2.D0*WZ*SFE | |
47 | WZ=2.D0*Z-1.D0 | |
48 | RETURN | |
49 | END |