| 1 |
greg |
1.9 |
{ RCSid $Id: klems_int.cal,v 1.8 2014/07/10 17:43:18 greg Exp $ } |
| 2 |
greg |
1.1 |
{ |
| 3 |
greg |
1.3 |
Compute interior bin for (full) Klems BSDF basis (0-144) |
| 4 |
greg |
1.8 |
Returns 145 (Nkbins) for wrong-side rays |
| 5 |
greg |
1.1 |
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| 6 |
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Modified from Tregenza.cal, which is similar but different |
| 7 |
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| 8 |
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6/14/2009 G. Ward |
| 9 |
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} |
| 10 |
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DEGREE : PI/180; |
| 11 |
greg |
1.7 |
Acos(x) : if(x-1, 0, if(-1-x, PI, acos(x))) / DEGREE; |
| 12 |
greg |
1.6 |
posangle(a) : if(-a, a + 2*PI, a) / DEGREE; |
| 13 |
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Atan2(y,x) : posangle(atan2(y,x)); |
| 14 |
greg |
1.1 |
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| 15 |
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kpola(r) : select(r, 5, 15, 25, 35, 45, 55, 65, 75, 90); |
| 16 |
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knaz(r) : select(r, 1, 8, 16, 20, 24, 24, 24, 16, 12); |
| 17 |
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kaccum(r) : if(r-.5, knaz(r) + kaccum(r-1), 0); |
| 18 |
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kfindrow(r, pol) : if(r-kpola(0)+.5, r, |
| 19 |
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if(pol-kpola(r), kfindrow(r+1, pol), r) ); |
| 20 |
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| 21 |
greg |
1.3 |
kazn(azi,inc) : if((360-.5*inc)-azi, floor((azi+.5*inc)/inc), 0); |
| 22 |
greg |
1.1 |
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| 23 |
greg |
1.9 |
kbin2(pol,azi) = if(pol-90, -1, |
| 24 |
greg |
1.8 |
select(kfindrow(1, pol), |
| 25 |
greg |
1.1 |
kazn(azi,360/knaz(1)), |
| 26 |
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kaccum(1) + kazn(azi,360/knaz(2)), |
| 27 |
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kaccum(2) + kazn(azi,360/knaz(3)), |
| 28 |
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kaccum(3) + kazn(azi,360/knaz(4)), |
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kaccum(4) + kazn(azi,360/knaz(5)), |
| 30 |
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kaccum(5) + kazn(azi,360/knaz(6)), |
| 31 |
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kaccum(6) + kazn(azi,360/knaz(7)), |
| 32 |
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kaccum(7) + kazn(azi,360/knaz(8)), |
| 33 |
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kaccum(8) + kazn(azi,360/knaz(9)) |
| 34 |
greg |
1.8 |
) ); |
| 35 |
greg |
1.1 |
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| 36 |
greg |
1.2 |
kbin(Nx,Ny,Nz,Ux,Uy,Uz) = kbin2(Acos(-Dx*Nx-Dy*Ny-Dz*Nz), |
| 37 |
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Atan2(-Dx*Ux-Dy*Uy-Dz*Uz, |
| 38 |
greg |
1.6 |
-Dx*(Uy*Nz-Uz*Ny) - Dy*(Uz*Nx-Ux*Nz) - Dz*(Ux*Ny-Uy*Nx))); |
| 39 |
greg |
1.1 |
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| 40 |
greg |
1.4 |
kbinN = kbin(0,-1,0, 0,0,1); { North bins } |
| 41 |
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kbinE = kbin(-1,0,0, 0,0,1); { East bins } |
| 42 |
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kbinS = kbin(0,1,0, 0,0,1); { South bins } |
| 43 |
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kbinW = kbin(1,0,0, 0,0,1); { West bins } |
| 44 |
greg |
1.1 |
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| 45 |
greg |
1.5 |
kbinD = kbin(0,0,-1, 0,1,0); { Skylight bins } |
| 46 |
greg |
1.1 |
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| 47 |
greg |
1.5 |
Nkbins : kaccum(knaz(0)); { Number of bins for one elevation } |
