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#include "glare.h" |
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#include "random.h" |
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|
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#define FEQ(a,b) ((a)-(b)<=FTINY&&(a)-(b)<=FTINY) |
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#define VEQ(v1,v2) (FEQ((v1)[0],(v2)[0])&&FEQ((v1)[1],(v2)[1]) \ |
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&&FEQ((v1)[2],(v2)[2])) |
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int verbose = 0; /* verbose reporting */ |
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char *progname; /* global argv[0] */ |
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double threshold = 0.; /* glare threshold */ |
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|
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int sampdens = SAMPDENS; /* sample density */ |
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ANGLE glarang[180] = {AEND}; /* glare calculation angles */ |
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int nglarangs = 0; |
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struct illum *indirect; /* array of indirect illuminances */ |
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long npixinvw; /* number of pixels in view */ |
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long npixmiss; /* number of pixels missed */ |
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|
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main(argc, argv) |
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int argc; |
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char *argv[]; |
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continue; |
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} |
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switch (argv[i][1]) { |
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case 't': |
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threshold = atof(argv[++i]); |
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break; |
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case 'r': |
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sampdens = atoi(argv[++i])/2; |
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break; |
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exit(1); |
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} |
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init(); /* initialize program */ |
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comp_thresh(); /* compute glare threshold */ |
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if (threshold <= FTINY) |
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comp_thresh(); /* compute glare threshold */ |
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analyze(); /* analyze view */ |
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cleanup(); /* tidy up */ |
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/* print header */ |
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/* set direction vectors */ |
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for (i = 0; glarang[i] != AEND; i++) |
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; |
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if (i > 0 && glarang[0] <= 0 || glarang[i-1] >= 180) { |
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if (i > 0 && (glarang[0] <= 0 || glarang[i-1] >= 180)) { |
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fprintf(stderr, "%s: glare angles must be between 1 and 179\n", |
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progname); |
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exit(1); |
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indirect = (struct illum *)calloc(nglardirs, sizeof(struct illum)); |
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if (indirect == NULL) |
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memerr("indirect illuminances"); |
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npixinvw = npixmiss = 0L; |
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copystruct(&leftview, &ourview); |
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copystruct(&rightview, &ourview); |
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spinvector(leftview.vdir, ourview.vdir, ourview.vup, maxtheta); |
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setview(&rightview); |
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indirect[nglarangs].lcos = |
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indirect[nglarangs].rcos = cos(maxtheta); |
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indirect[nglarangs].lsin = |
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-(indirect[nglarangs].rsin = sin(maxtheta)); |
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indirect[nglarangs].rsin = |
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-(indirect[nglarangs].lsin = sin(maxtheta)); |
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indirect[nglarangs].theta = 0.0; |
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for (i = 0; i < nglarangs; i++) { |
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d = (glarang[nglarangs-1] - glarang[i])*(PI/180.); |
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indirect[nglarangs-i-1].lcos = |
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indirect[nglarangs+i+1].rcos = cos(d); |
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indirect[nglarangs-i-1].lsin = |
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-(indirect[nglarangs+i+1].rsin = sin(d)); |
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indirect[nglarangs+i+1].rsin = |
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-(indirect[nglarangs-i-1].lsin = sin(d)); |
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d = (glarang[nglarangs-1] + glarang[i])*(PI/180.); |
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indirect[nglarangs-i-1].rcos = |
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indirect[nglarangs+i+1].lcos = cos(d); |
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indirect[nglarangs+i+1].lsin = |
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-(indirect[nglarangs-i-1].rsin = sin(d)); |
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indirect[nglarangs-i-1].theta = -(PI/180.)*glarang[i]; |
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indirect[nglarangs+i+1].theta = (PI/180.)*glarang[i]; |
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indirect[nglarangs-i-1].rsin = |
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-(indirect[nglarangs+i+1].lsin = sin(d)); |
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indirect[nglarangs-i-1].theta = (PI/180.)*glarang[i]; |
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indirect[nglarangs+i+1].theta = -(PI/180.)*glarang[i]; |
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} |
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/* open picture */ |
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if (picture != NULL) { |
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close_pict(); |
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if (octree != NULL) |
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done_rtrace(); |
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if (npixinvw < 100*npixmiss) |
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fprintf(stderr, "%s: warning -- missing %ld%% of samples\n", |
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progname, 100L*npixmiss/npixinvw); |
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} |
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FVECT vd; |
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int x, y; |
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{ |
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long t; |
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FVECT org; /* dummy variable */ |
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if (x <= -hlim) /* left region */ |
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return(viewray(org, vd, &leftview, |
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(x+hlim)/(2.*sampdens)+.5, |
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y/(2.*sampdens)+.5)); |
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(double)(x+hlim)/(2*sampdens)+.5, |
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(double)y/(2*sampdens)+.5)); |
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if (x >= hlim) /* right region */ |
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return(viewray(org, vd, &rightview, |
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(x-hlim)/(2.*sampdens)+.5, |
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y/(2.*sampdens)+.5)); |
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/* central region */ |
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if (viewray(org, vd, &ourview, .5, y/(2.*sampdens)+.5) < 0) |
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(double)(x-hlim)/(2*sampdens)+.5, |
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(double)y/(2*sampdens)+.5)); |
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/* central region */ |
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/* avoid over-counting of poles */ |
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t = random() % vsize; |
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if (t*t >= (long)vsize*vsize - (long)y*y) |
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return(-1); |
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if (viewray(org, vd, &ourview, .5, (double)y/(2*sampdens)+.5) < 0) |
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return(-1); |
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spinvector(vd, vd, ourview.vup, h_theta(x)); |
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return(0); |
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} |
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spinvector(vres, vorig, vnorm, theta) /* rotate vector around normal */ |
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FVECT vres, vorig, vnorm; |
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double theta; |
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{ |
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extern double sin(), cos(); |
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double sint, cost, dotp; |
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FVECT vperp; |
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register int i; |
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|
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sint = sin(theta); |
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cost = cos(theta); |
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dotp = DOT(vorig, vnorm); |
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fcross(vperp, vnorm, vorig); |
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for (i = 0; i < 3; i++) |
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vres[i] = vnorm[i]*dotp*(1.-cost) + |
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vorig[i]*cost + vperp[i]*sint; |
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} |
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memerr(s) /* malloc failure */ |
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char *s; |
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{ |
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printf("BEGIN indirect illuminance\n"); |
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for (i = 0; i < nglardirs; i++) |
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printf("\t%.0f\t%f\n", (180.0/PI)*indirect[i].theta, |
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PI * indirect[i].sum / (double)indirect[i].n); |
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if (indirect[i].n > FTINY) |
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printf("\t%.0f\t%f\n", (180.0/PI)*indirect[i].theta, |
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PI * indirect[i].sum / indirect[i].n); |
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printf("END indirect illuminance\n"); |
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} |