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greg |
1.6 |
{ RCSid $Id: klems_quarter.cal,v 1.5 2015/03/27 18:58:06 greg Exp $ } |
| 2 |
greg |
1.1 |
{ |
| 3 |
greg |
1.2 |
Compute interior bin for quarter Klems BSDF basis (0-40) |
| 4 |
greg |
1.1 |
Returns -1 for wrong-side rays |
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Modified from klems_full.cal |
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7/18/2014 G. Ward |
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} |
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DEGREE : PI/180; |
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Acos(x) : if(x-1, 0, if(-1-x, PI, acos(x))) / DEGREE; |
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posangle(a) : if(-a, a + 2*PI, a) / DEGREE; |
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Atan2(y,x) : posangle(atan2(y,x)); |
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| 15 |
greg |
1.6 |
kqpola(r) : select(r, 9, 27, 45, 63, 90); |
| 16 |
greg |
1.3 |
kqnaz(r) : select(r, 1, 8, 12, 12, 8); |
| 17 |
greg |
1.1 |
kqaccum(r) : if(r-.5, kqnaz(r) + kqaccum(r-1), 0); |
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kqfindrow(r, pol) : if(r-kqpola(0)+.5, r, |
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if(pol-kqpola(r), kqfindrow(r+1, pol), r) ); |
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kqazn(azi,inc) : if((360-.5*inc)-azi, floor((azi+.5*inc)/inc), 0); |
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kqbin2(pol,azi) = if(pol-90, -1, |
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select(kqfindrow(1, pol), |
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kqazn(azi,360/kqnaz(1)), |
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kqaccum(1) + kqazn(azi,360/kqnaz(2)), |
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kqaccum(2) + kqazn(azi,360/kqnaz(3)), |
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kqaccum(3) + kqazn(azi,360/kqnaz(4)), |
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kqaccum(4) + kqazn(azi,360/kqnaz(5)) |
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) ); |
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| 32 |
greg |
1.5 |
RHS = 1; { set to -1 for left-handed system } |
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| 34 |
greg |
1.1 |
kqbin(Nx,Ny,Nz,Ux,Uy,Uz) = kqbin2(Acos(-Dx*Nx-Dy*Ny-Dz*Nz), |
| 35 |
greg |
1.4 |
Atan2(-Dx*Ux-Dy*Uy-Dz*Uz + (Nx*Dx+Ny*Dy+Nz*Dz)*(Nx*Ux+Ny*Uy+Nz*Uz), |
| 36 |
greg |
1.5 |
-RHS*(Dx*(Uy*Nz-Uz*Ny) + Dy*(Uz*Nx-Ux*Nz) + Dz*(Ux*Ny-Uy*Nx)))); |
| 37 |
greg |
1.1 |
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| 38 |
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Nkqbins : kqaccum(kqnaz(0)); { Number of bins for one elevation } |
