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root/radiance/ray/src/util/rambpos.cal
Revision: 2.6
Committed: Thu May 15 17:30:53 2014 UTC (9 years, 10 months ago) by greg
Branch: MAIN
CVS Tags: rad4R2
Changes since 2.5: +19 -15 lines
Log Message:
Improved geometry

File Contents

# User Rev Content
1 greg 2.6 { RCSid $Id: rambpos.cal,v 2.5 2014/05/09 23:49:05 greg Exp $ }
2 greg 2.1 {
3     Compute ambient position factors for genambpos.pl
4     }
5     and(a,b) : if(a,b,a);
6     { level selector }
7 greg 2.2 lvl = $10;
8     wt = $11;
9 greg 2.5 r0 = SF*$12; r1 = SF*$13;
10 greg 2.6 eps = r0*.015;
11 greg 2.5 acond = and( r0-5e-5, and( wt-MW, if(LV+.5, and(lvl-LV+.5,LV+.5-lvl), 6.5-lvl) ) );
12 greg 2.1 nx = $4; ny = $5; nz = $6;
13     ux = $7; uy = $8; uz = $9;
14     vx = ny*uz - nz*uy;
15     vy = nz*ux - nx*uz;
16     vz = nx*uy - ny*ux;
17 greg 2.6 px = $1 + nx*eps;
18     py = $2 + ny*eps;
19     pz = $3 + nz*eps;
20 greg 2.3 avr = .5/PI*$14; avg = .5/PI*$15; avb = .5/PI*$16;
21 greg 2.1 { magnified position gradient }
22     pgx = ($17*ux + $18*vx)/SF;
23     pgy = ($17*uy + $18*vy)/SF;
24     pgz = ($17*uz + $18*vz)/SF;
25     pg = sqrt(pgx*pgx + pgy*pgy + pgz*pgz);
26 greg 2.4 pcond = and( acond, pg - .0001 );
27 greg 2.1 { direction gradient }
28     dgx = $19*ux + $20*vx;
29     dgy = $19*uy + $20*vy;
30     dgz = $19*uz + $20*vz;
31 greg 2.6 dg = sqrt(dgx*dgx + dgy*dgy + dgz*dgz);
32 greg 2.1 val = avr + avg + avb; { ambient position color }
33 greg 2.2 agr = select(lvl+1, val, 0, 0, val, 0, val, val);
34     agg = select(lvl+1, 0, val, 0, val, val, 0, val/2);
35     agb = select(lvl+1, 0, 0, val, 0, val, val, val/2);
36 greg 2.1 psiz = r0/10;
37 greg 2.6 dcond = and( acond, dg - .0001 );
38 greg 2.1 { base polygon vertices }
39 greg 2.6 px1 = px + r0*ux + r1*vx;
40     py1 = py + r0*uy + r1*vy;
41     pz1 = pz + r0*uz + r1*vz;
42     px2 = px - r0*ux + r1*vx;
43     py2 = py - r0*uy + r1*vy;
44     pz2 = pz - r0*uz + r1*vz;
45     px3 = px - r0*ux - r1*vx;
46     py3 = py - r0*uy - r1*vy;
47     pz3 = pz - r0*uz - r1*vz;
48     px4 = px + r0*ux - r1*vx;
49     py4 = py + r0*uy - r1*vy;
50     pz4 = pz + r0*uz - r1*vz;
51 greg 2.1 alen = psiz*3; { arrow length & coordinates }
52     cx0 = px + psiz*psiz/alen*pgx/pg;
53     cy0 = py + psiz*psiz/alen*pgy/pg;
54     cz0 = pz + psiz*psiz/alen*pgz/pg;
55     cr0 = psiz*sqrt(1 - psiz*psiz/(alen*alen));
56     cx1 = px + alen*pgx/pg;
57     cy1 = py + alen*pgy/pg;
58     cz1 = pz + alen*pgz/pg;