1 |
{ RCSid $Id: rskysrc.cal,v 1.1 2009/07/01 00:39:34 greg Exp $ } |
2 |
{ |
3 |
Reinhart sky patch positions & solid angles |
4 |
|
5 |
Greg Ward June 2009 |
6 |
|
7 |
Based on tregsrc.cal |
8 |
MF controls patch density |
9 |
|
10 |
Input is Rbin from 1-(144*MF+1) and optional x1 x2 random variables |
11 |
Output is Dx Dy Dz theta (degree full angle of source) |
12 |
} |
13 |
DEGREE : PI/180; |
14 |
|
15 |
x1 = .5; x2 = .5; { default rand. var. settings for midpoint } |
16 |
|
17 |
MF : 2^2; { Multiplication factor } |
18 |
alpha : 90/(MF*7 + .5); { Separation between rows in degrees } |
19 |
{ Number of patches per row } |
20 |
tnaz(r) : select(r, 30, 30, 24, 24, 18, 12, 6); |
21 |
rnaz(r) : if(r-(7*MF-.5), 1, MF*tnaz(floor((r+.5)/MF) + 1)); |
22 |
|
23 |
raccum(r) : if(r-.5, rnaz(r-1) + raccum(r-1), 0); |
24 |
|
25 |
RowMax : 7*MF + 1; |
26 |
Rmax : raccum(RowMax); |
27 |
|
28 |
Rfindrow(r, rem) : if(rem-rnaz(r)-.5, Rfindrow(r+1, rem-rnaz(r)), r); |
29 |
Rrow = if(Rbin-(Rmax-.5), RowMax, Rfindrow(0, Rbin)); |
30 |
Rcol = Rbin - raccum(Rrow) - 1; |
31 |
|
32 |
|
33 |
Razi_width = 2*PI / rnaz(Rrow); |
34 |
|
35 |
RAH : alpha*DEGREE; |
36 |
|
37 |
Razi = (Rcol + x2 - .5)*Razi_width; |
38 |
Ralt = (Rrow + x1)*RAH; |
39 |
|
40 |
Romega = if(Rmax-.5-Rbin, |
41 |
Razi_width*(sin(RAH*(Rrow+1)) - sin(RAH*Rrow)), |
42 |
2*PI*(1 - cos(RAH/2)) ); |
43 |
|
44 |
cos_ralt = cos(Ralt); |
45 |
|
46 |
Dx = sin(Razi)*cos_ralt; |
47 |
Dy = cos(Razi)*cos_ralt; |
48 |
Dz = sin(Ralt); |
49 |
|
50 |
theta = 2/DEGREE * acos(1 - Romega/(2*PI)); |