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/* Copyright (c) 1991 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Routines to do the actual calculation for mkillum |
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*/ |
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#include "mkillum.h" |
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#include "face.h" |
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#include "cone.h" |
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#include "random.h" |
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sprintf(errmsg, "(%s): cannot make illum for %s \"%s\"", |
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nm, ofun[ob->otype].funame, ob->oname); |
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error(WARNING, errmsg); |
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if (!(il->flags & IL_LIGHT)) |
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printobj(il->altmat, ob); |
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printobj(il->altmat, ob); |
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} |
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distarr = (float *)calloc(n, 3*sizeof(float)); |
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if (distarr == NULL) |
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error(SYSTEM, "out of memory in o_face"); |
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mkaxes(u, v, fa->norm); |
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/* take first edge longer than sqrt(area) */ |
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for (j = fa->nv-1, i = 0; i < fa->nv; j = i++) { |
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u[0] = VERTEX(fa,i)[0] - VERTEX(fa,j)[0]; |
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u[1] = VERTEX(fa,i)[1] - VERTEX(fa,j)[1]; |
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u[2] = VERTEX(fa,i)[2] - VERTEX(fa,j)[2]; |
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if ((r1 = DOT(u,u)) >= fa->area-FTINY) |
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break; |
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} |
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if (i < fa->nv) { /* got one! -- let's align our axes */ |
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r2 = 1.0/sqrt(r1); |
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u[0] *= r2; u[1] *= r2; u[2] *= r2; |
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fcross(v, fa->norm, u); |
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} else /* oh well, we'll just have to wing it */ |
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mkaxes(u, v, fa->norm); |
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/* now, find limits in (u,v) coordinates */ |
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ur[0] = vr[0] = FHUGE; |
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ur[1] = vr[1] = -FHUGE; |
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for (i = 0; i < fa->nv; i++) { |
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h = ilhash(dim, 3) + i; |
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multisamp(sp, 2, urand(h)); |
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r1 = (dim[1] + sp[0])/nalt; |
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r2 = (dim[2] + sp[1])/nazi; |
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r2 = (dim[2] + sp[1] - .5)/nazi; |
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flatdir(dn, r1, r2); |
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for (j = 0; j < 3; j++) |
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dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*fa->norm[j]; |
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objerror(ob, WARNING, "bad aspect"); |
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rt->nrays = 0; |
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freeface(ob); |
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free((char *)distarr); |
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free((void *)distarr); |
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o_default(ob, il, rt, nm); |
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return; |
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} |
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if (il->sampdens > 0) |
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flatout(il, distarr, nalt, nazi, u, v, fa->norm); |
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illumout(il, ob); |
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} else if (!(il->flags & IL_LIGHT)) |
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} else |
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printobj(il->altmat, ob); |
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/* clean up */ |
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freeface(ob); |
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free((char *)distarr); |
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free((void *)distarr); |
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#undef MAXMISS |
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} |
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nalt = nazi = 1; |
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else { |
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n = 4.*PI * il->sampdens; |
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nalt = sqrt(n/PI) + .5; |
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nazi = PI*nalt + .5; |
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nalt = sqrt(2./PI*n) + .5; |
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nazi = PI/2.*nalt + .5; |
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} |
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n = nalt*nazi; |
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distarr = (float *)calloc(n, 3*sizeof(float)); |
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multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
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/* random direction */ |
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r1 = (dim[1] + sp[0])/nalt; |
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r2 = (dim[2] + sp[1])/nazi; |
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r2 = (dim[2] + sp[1] - .5)/nazi; |
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rounddir(dir, r1, r2); |
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/* random location */ |
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mkaxes(u, v, dir); /* yuck! */ |
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else |
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objerror(ob, WARNING, "diffuse distribution"); |
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illumout(il, ob); |
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} else if (!(il->flags & IL_LIGHT)) |
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} else |
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printobj(il->altmat, ob); |
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/* clean up */ |
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free((char *)distarr); |
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free((void *)distarr); |
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} |
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multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
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/* random direction */ |
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r1 = (dim[1] + sp[0])/nalt; |
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r2 = (dim[2] + sp[1])/nalt; |
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r2 = (dim[2] + sp[1] - .5)/nazi; |
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flatdir(dn, r1, r2); |
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for (j = 0; j < 3; j++) |
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dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
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r1 = r3*cos(r2); |
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r2 = r3*sin(r2); |
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for (j = 0; j < 3; j++) |
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org[j] = CO_P0(co)[j] + r1*u[j] + r1*v[j] + |
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org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
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.001*co->ad[j]; |
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/* send sample */ |
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if (il->sampdens > 0) |
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flatout(il, distarr, nalt, nazi, u, v, co->ad); |
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illumout(il, ob); |
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} else if (!(il->flags & IL_LIGHT)) |
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} else |
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printobj(il->altmat, ob); |
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/* clean up */ |
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freecone(ob); |
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free((char *)distarr); |
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free((void *)distarr); |
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} |
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if (rt->nrays <= 0) |
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return; |
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bzero(rt->buf+6*rt->nrays, 6*sizeof(float)); |
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if ( process(rt->pd, (char *)rt->buf, (char *)rt->buf, |
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3*sizeof(float)*rt->nrays, |
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errno = 0; |
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if ( process(&(rt->pd), (char *)rt->buf, (char *)rt->buf, |
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3*sizeof(float)*(rt->nrays+1), |
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6*sizeof(float)*(rt->nrays+1)) < |
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3*sizeof(float)*rt->nrays ) |
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3*sizeof(float)*(rt->nrays+1) ) |
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error(SYSTEM, "error reading from rtrace process"); |
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i = rt->nrays; |
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while (i--) { |
