/usr/share/radiance/reinhart.cal is in radiance-materials 4R0+20110410-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | { RCSid $Id: reinhart.cal,v 1.4 2009/12/09 21:34:23 greg Exp $ }
{
Compute Reinhart high-density sky patches
Actual density controlled by MF constant
Modified from Tregenza.cal
Need to specify MF constant before loading (usu. power of two)
June 2009 G. Ward
}
DEGREE : PI/180;
Asin(x) : if(x-1, PI/2, if(-1-x, -PI/2, asin(x)));
posangle(a) : if(-a, a + 2*PI, a);
Atan2(y,x) : posangle(atan2(y,x));
alt = Asin(Dz)/DEGREE;
azi = Atan2(Dx,Dy)/DEGREE;
alpha : 90/(MF*7 + .5); { Separation between rows in degrees }
{ Number of patches per row }
tnaz(r) : select(r, 30, 30, 24, 24, 18, 12, 6);
rnaz(r) : if(r-(7*MF-.5), 1, MF*tnaz(floor((r+.5)/MF) + 1));
raccum(r) : if(r-.5, rnaz(r-1) + raccum(r-1), 0);
r_row = floor(alt/alpha);
r_inc = 360/rnaz(r_row);
r_azn = if(359.9999-.5*r_inc - azi, floor((azi+.5*r_inc)/r_inc), 0);
rbin = if (-alt, 0, raccum(r_row) + r_azn + 1);
Nrbins : raccum(7*MF+1) + 1; { total number of bins }
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