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{ RCSid $Id: rambpos.cal,v 2.6 2014/05/15 17:30:53 greg Exp $ } |
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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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lvl = $10; |
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wt = $11; |
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r0 = SF*$12; r1 = SF*$13; |
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eps = r0*.015; |
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acond = and( r0-5e-5, and( wt-MW, if(LV+.5, and(lvl-LV+.5,LV+.5-lvl), 6.5-lvl) ) ); |
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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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px = $1 + nx*eps; |
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py = $2 + ny*eps; |
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pz = $3 + nz*eps; |
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avr = .5/PI*$14; avg = .5/PI*$15; avb = .5/PI*$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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pcond = and( acond, pg - .0001 ); |
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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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dg = sqrt(dgx*dgx + dgy*dgy + dgz*dgz); |
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{ corral flags pattern } |
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cflags = $21; |
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{ ambient position color } |
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val = avr + avg + avb; |
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agr = select(lvl+1, val, 0, 0, val, 0, val, val); |
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agg = select(lvl+1, 0, val, 0, val, val, 0, val/2); |
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agb = select(lvl+1, 0, 0, val, 0, val, val, val/2); |
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psiz = r0/10; |
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dcond = and( acond, dg - .0001 ); |
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{ base polygon vertices } |
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px1 = px + r0*ux + r1*vx; |
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py1 = py + r0*uy + r1*vy; |
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pz1 = pz + r0*uz + r1*vz; |
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px2 = px - r0*ux + r1*vx; |
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py2 = py - r0*uy + r1*vy; |
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pz2 = pz - r0*uz + r1*vz; |
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px3 = px - r0*ux - r1*vx; |
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py3 = py - r0*uy - r1*vy; |
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pz3 = pz - r0*uz - r1*vz; |
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px4 = px + r0*ux - r1*vx; |
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py4 = py + r0*uy - r1*vy; |
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pz4 = pz + r0*uz - r1*vz; |
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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; |
