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root/radiance/ray/src/util/klems_quarter.cal
Revision: 1.6
Committed: Thu Jul 14 02:52:02 2022 UTC (2 months, 2 weeks ago) by greg
Branch: MAIN
CVS Tags: HEAD
Changes since 1.5: +2 -2 lines
Log Message:
fix: updated and corrected Klems half and quarter bases to match WINDOW

File Contents

# Content
1 { RCSid $Id: klems_quarter.cal,v 1.5 2015/03/27 18:58:06 greg Exp $ }
2 {
3 Compute interior bin for quarter Klems BSDF basis (0-40)
4 Returns -1 for wrong-side rays
5
6 Modified from klems_full.cal
7
8 7/18/2014 G. Ward
9 }
10 DEGREE : PI/180;
11 Acos(x) : if(x-1, 0, if(-1-x, PI, acos(x))) / DEGREE;
12 posangle(a) : if(-a, a + 2*PI, a) / DEGREE;
13 Atan2(y,x) : posangle(atan2(y,x));
14
15 kqpola(r) : select(r, 9, 27, 45, 63, 90);
16 kqnaz(r) : select(r, 1, 8, 12, 12, 8);
17 kqaccum(r) : if(r-.5, kqnaz(r) + kqaccum(r-1), 0);
18 kqfindrow(r, pol) : if(r-kqpola(0)+.5, r,
19 if(pol-kqpola(r), kqfindrow(r+1, pol), r) );
20
21 kqazn(azi,inc) : if((360-.5*inc)-azi, floor((azi+.5*inc)/inc), 0);
22
23 kqbin2(pol,azi) = if(pol-90, -1,
24 select(kqfindrow(1, pol),
25 kqazn(azi,360/kqnaz(1)),
26 kqaccum(1) + kqazn(azi,360/kqnaz(2)),
27 kqaccum(2) + kqazn(azi,360/kqnaz(3)),
28 kqaccum(3) + kqazn(azi,360/kqnaz(4)),
29 kqaccum(4) + kqazn(azi,360/kqnaz(5))
30 ) );
31
32 RHS = 1; { set to -1 for left-handed system }
33
34 kqbin(Nx,Ny,Nz,Ux,Uy,Uz) = kqbin2(Acos(-Dx*Nx-Dy*Ny-Dz*Nz),
35 Atan2(-Dx*Ux-Dy*Uy-Dz*Uz + (Nx*Dx+Ny*Dy+Nz*Dz)*(Nx*Ux+Ny*Uy+Nz*Uz),
36 -RHS*(Dx*(Uy*Nz-Uz*Ny) + Dy*(Uz*Nx-Ux*Nz) + Dz*(Ux*Ny-Uy*Nx))));
37
38 Nkqbins : kqaccum(kqnaz(0)); { Number of bins for one elevation }