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{ RCSid $Id$ } |
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{ |
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Compute ambient position factors for genambpos.pl |
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} |
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and(a,b) : if(a,b,a); |
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{ level selector } |
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cond = if(LV+.5, and($10-LV-.5,LV+.5-$10), 1); |
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px = $1; py = $2; pz = $3; |
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r0 = SF*$12; r1 = SF*$13; |
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nx = $4; ny = $5; nz = $6; |
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ux = $7; uy = $8; uz = $9; |
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vx = ny*uz - nz*uy; |
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vy = nz*ux - nx*uz; |
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vz = nx*uy - ny*ux; |
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avr = $14; avg = $15; avb = $16; |
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{ magnified position gradient } |
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pgx = ($17*ux + $18*vx)/SF; |
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pgy = ($17*uy + $18*vy)/SF; |
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pgz = ($17*uz + $18*vz)/SF; |
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pg = sqrt(pgx*pgx + pgy*pgy + pgz*pgz); |
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{ direction gradient } |
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dgx = $19*ux + $20*vx; |
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dgy = $19*uy + $20*vy; |
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dgz = $19*uz + $20*vz; |
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val = avr + avg + avb; { ambient position color } |
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agr = select($10+1, val, 0, 0, val, 0, val, val); |
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agg = select($10+1, 0, val, 0, val, val, 0, val/2); |
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agb = select($10+1, 0, 0, val, 0, val, val, val/2); |
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psiz = r0/10; |
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{ base polygon vertices } |
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px1 = px + r0*ux + r1*vx + .0001*nx; |
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py1 = py + r0*uy + r1*vy + .0001*ny; |
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pz1 = pz + r0*uz + r1*vz + .0001*nz; |
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px2 = px - r0*ux + r1*vx + .0001*nx; |
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py2 = py - r0*uy + r1*vy + .0001*ny; |
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pz2 = pz - r0*uz + r1*vz + .0001*nz; |
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px3 = px - r0*ux - r1*vx + .0001*nx; |
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py3 = py - r0*uy - r1*vy + .0001*ny; |
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pz3 = pz - r0*uz - r1*vz + .0001*nz; |
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px4 = px + r0*ux - r1*vx + .0001*nx; |
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py4 = py + r0*uy - r1*vy + .0001*ny; |
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pz4 = pz + r0*uz - r1*vz + .0001*nz; |
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alen = psiz*3; { arrow length & coordinates } |
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cx0 = px + psiz*psiz/alen*pgx/pg; |
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cy0 = py + psiz*psiz/alen*pgy/pg; |
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cz0 = pz + psiz*psiz/alen*pgz/pg; |
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cr0 = psiz*sqrt(1 - psiz*psiz/(alen*alen)); |
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cx1 = px + alen*pgx/pg; |
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cy1 = py + alen*pgy/pg; |
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cz1 = pz + alen*pgz/pg; |
