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{ RCSid $Id$ } |
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Compute interior bin for (full) Klems BSDF basis |
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Compute interior bin for (full) Klems BSDF basis (0-144) |
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Modified from Tregenza.cal, which is similar but different |
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kfindrow(r, pol) : if(r-kpola(0)+.5, r, |
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if(pol-kpola(r), kfindrow(r+1, pol), r) ); |
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kazn(azi,inc) : if(azi-(360-.5*inc), 0, floor((azi+.5*inc)/inc)); |
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kazn(azi,inc) : if((360-.5*inc)-azi, floor((azi+.5*inc)/inc), 0); |
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kbin2(pol,azi) = select(kfindrow(1, pol), |
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kazn(azi,360/knaz(1)), |
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Atan2(-Dx*Ux-Dy*Uy-Dz*Uz, |
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-Dx*(Ny*Uz-Nz*Uy) - Dy*(Nz*Ux-Nx*Uz) - Dz*(Nx*Uy-Ny*Ux))); |
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kbinN = kbin(0,1,0, 0,0,1); { North bins } |
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kbinE = kbin(1,0,0, 0,0,1); { East bins } |
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kbinS = kbin(0,-1,0, 0,0,1); { South bins } |
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kbinW = kbin(-1,0,0, 0,0,1); { West bins } |
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kbinN = kbin(0,-1,0, 0,0,1); { North bins } |
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kbinE = kbin(-1,0,0, 0,0,1); { East bins } |
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kbinS = kbin(0,1,0, 0,0,1); { South bins } |
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kbinW = kbin(1,0,0, 0,0,1); { West bins } |
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kbinU = kbin(0,0,1, 0,1,0); { "Up" bins for skylights } |
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kbinD = kbin(0,0,-1, 0,1,0); { Skylight bins } |
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Nkbins : kaccum(knaz(0)); { total number of bins } |
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Nkbins : kaccum(knaz(0)); { Number of bins for one elevation } |
