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#ifndef lint
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static const char RCSid[] = "$Id: mkillum2.c,v 2.43 2023/11/17 20:02:07 greg Exp $";
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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 <string.h>
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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 "source.h"
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#include "paths.h"
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#ifndef R_EPS
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#define R_EPS 0.005 /* relative epsilon for ray origin */
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#endif
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COLORV * distarr = NULL; /* distribution array */
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int distsiz = 0;
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void
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newdist( /* allocate & clear distribution array */
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int siz
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)
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{
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if (siz <= 0) {
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if (distsiz > 0)
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free(distarr);
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distarr = NULL;
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distsiz = 0;
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return;
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}
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if (distsiz < siz) {
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if (distsiz > 0)
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free(distarr);
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distarr = (COLORV *)malloc(sizeof(COLOR)*siz);
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if (distarr == NULL)
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error(SYSTEM, "out of memory in newdist");
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distsiz = siz;
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}
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memset(distarr, '\0', sizeof(COLOR)*siz);
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}
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int
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process_ray( /* process a ray result or report error */
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RAY *r,
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int rv
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)
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{
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COLORV *colp;
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if (rv == 0) /* no result ready */
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return(0);
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if (rv < 0)
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error(USER, "ray tracing process died");
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if (r->rno >= distsiz)
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error(INTERNAL, "bad returned index in process_ray");
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smultscolor(r->rcol, r->rcoef); /* in case it's a source ray */
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colp = &distarr[r->rno * 3];
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addscolor(colp, r->rcol);
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return(1);
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}
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void
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raysamp( /* queue a ray sample */
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int ndx,
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FVECT org,
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FVECT dir
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)
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{
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RAY myRay;
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int rv;
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if ((ndx < 0) | (ndx >= distsiz))
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error(INTERNAL, "bad index in raysamp");
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VCOPY(myRay.rorg, org);
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VCOPY(myRay.rdir, dir);
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myRay.rmax = .0;
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rayorigin(&myRay, PRIMARY|SPECULAR, NULL, NULL);
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myRay.rno = ndx;
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/* queue ray, check result */
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process_ray(&myRay, ray_pqueue(&myRay));
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}
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void
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srcsamps( /* sample sources from this surface position */
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struct illum_args *il,
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FVECT org,
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double eps,
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MAT4 ixfm
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)
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{
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int nalt=1, nazi=1;
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SRCINDEX si;
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RAY sr;
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FVECT v;
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double d;
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int i, j;
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/* get sampling density */
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if (il->sampdens > 0) {
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i = PI * il->sampdens;
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nalt = sqrt(i/PI) + .5;
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nazi = PI*nalt + .5;
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}
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initsrcindex(&si); /* loop over (sub)sources */
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for ( ; ; ) {
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VCOPY(sr.rorg, org); /* pick side to shoot from */
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samplendx++; /* increment sample counter */
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if (!srcray(&sr, NULL, &si))
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break; /* end of sources */
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/* index direction */
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if (ixfm != NULL)
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multv3(v, sr.rdir, ixfm);
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else
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VCOPY(v, sr.rdir);
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if (v[2] >= -FTINY)
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continue; /* only sample transmission */
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v[0] = -v[0]; v[1] = -v[1]; v[2] = -v[2];
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sr.rno = flatindex(v, nalt, nazi);
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d = nalt*nazi*(1./PI) * v[2];
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d *= si.dom; /* solid angle correction */
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scalescolor(sr.rcoef, d);
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VSUM(sr.rorg, sr.rorg, sr.rdir, -eps);
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process_ray(&sr, ray_pqueue(&sr));
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}
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}
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void
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rayclean() /* finish all pending rays */
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{
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RAY myRay;
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while (process_ray(&myRay, ray_presult(&myRay, 0)))
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;
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}
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static void
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mkaxes( /* compute u and v to go with n */
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FVECT u,
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FVECT v,
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FVECT n
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)
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{
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getperpendicular(u, n, 1);
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fcross(v, n, u);
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}
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static void
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rounddir( /* compute uniform spherical direction */
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FVECT dv,
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double alt,
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double azi
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)
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{
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double d1, d2;
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dv[2] = 1. - 2.*alt;
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d1 = sqrt(1. - dv[2]*dv[2]);
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d2 = 2.*PI * azi;
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dv[0] = d1*cos(d2);
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dv[1] = d1*sin(d2);
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}
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void
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flatdir( /* compute uniform hemispherical direction */
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FVECT dv,
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double alt,
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double azi
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)
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{
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double d1, d2;
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d1 = sqrt(alt);
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d2 = 2.*PI * azi;
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dv[0] = d1*cos(d2);
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dv[1] = d1*sin(d2);
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dv[2] = sqrt(1. - alt);
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}
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int
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flatindex( /* compute index for hemispherical direction */
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FVECT dv,
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int nalt,
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int nazi
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)
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{
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double d;
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int i, j;
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d = 1.0 - dv[2]*dv[2];
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i = d*nalt;
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d = atan2(dv[1], dv[0]) * (0.5/PI);
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if (d < 0.0) d += 1.0;
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j = d*nazi + 0.5;
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if (j >= nazi) j = 0;
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return(i*nazi + j);
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}
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int
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my_default( /* default illum action */
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OBJREC *ob,
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struct illum_args *il,
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char *nm
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)
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{
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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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printobj(il->altmat, ob);
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return(1);
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}
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int
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my_face( /* make an illum face */
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OBJREC *ob,
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struct illum_args *il,
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char *nm
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)
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{
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int dim[2];
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int n, nalt, nazi, alti;
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double sp[2], r1, r2;
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unsigned long h;
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FVECT dn, org, dir;
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FVECT u, v;
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double ur[2], vr[2];
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double epsilon;
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MAT4 xfm;
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char xfrot[64];
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int nallow;
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FACE *fa;
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int i, j;
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/* get/check arguments */
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fa = getface(ob);
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if (fa->area == 0.0) {
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freeface(ob);
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return(my_default(ob, il, nm));
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}
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/* set up sampling */
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if (il->sampdens <= 0) {
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nalt = nazi = 1; /* diffuse assumption */
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} else {
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n = PI * il->sampdens;
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nalt = sqrt(n/PI) + .5;
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nazi = PI*nalt + .5;
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}
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n = nazi*nalt;
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newdist(n);
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/* take first edge >= 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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r1 = DOT(VERTEX(fa,i),u);
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if (r1 < ur[0]) ur[0] = r1;
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if (r1 > ur[1]) ur[1] = r1;
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r2 = DOT(VERTEX(fa,i),v);
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if (r2 < vr[0]) vr[0] = r2;
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if (r2 > vr[1]) vr[1] = r2;
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}
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dim[0] = random();
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/* sample polygon */
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nallow = 5*n*il->nsamps;
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epsilon = R_EPS*sqrt(fa->area);
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for (dim[1] = 0; dim[1] < n; dim[1]++)
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for (i = 0; i < il->nsamps; i++) {
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/* randomize direction */
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h = ilhash(dim, 2) + i;
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multisamp(sp, 2, urand(h));
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alti = dim[1]/nazi;
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r1 = (alti + sp[0])/nalt;
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r2 = (dim[1] - alti*nazi + 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] -
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dn[2]*fa->norm[j];
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/* randomize location */
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do {
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multisamp(sp, 2, urand(h+4862+nallow));
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r1 = ur[0] + (ur[1]-ur[0]) * sp[0];
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r2 = vr[0] + (vr[1]-vr[0]) * sp[1];
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for (j = 0; j < 3; j++)
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org[j] = r1*u[j] + r2*v[j]
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+ fa->offset*fa->norm[j];
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} while (!inface(org, fa) && nallow-- > 0);
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if (nallow < 0) {
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objerror(ob, WARNING, "bad aspect");
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rayclean();
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freeface(ob);
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return(my_default(ob, il, nm));
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}
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VSUM(org, org, dir, -epsilon);
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/* send sample */
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raysamp(dim[1], org, dir);
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}
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/* add in direct component? */
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if (il->flags & IL_LIGHT) {
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MAT4 ixfm;
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for (i = 3; i--; ) {
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ixfm[i][0] = u[i];
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ixfm[i][1] = v[i];
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ixfm[i][2] = fa->norm[i];
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ixfm[i][3] = 0.;
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}
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ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.;
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ixfm[3][3] = 1.;
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dim[0] = random();
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| 334 |
nallow = 10*il->nsamps;
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for (i = 0; i < il->nsamps; i++) {
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| 336 |
/* randomize location */
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| 337 |
h = dim[0] + samplendx++;
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| 338 |
do {
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| 339 |
multisamp(sp, 2, urand(h+nallow));
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r1 = ur[0] + (ur[1]-ur[0]) * sp[0];
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r2 = vr[0] + (vr[1]-vr[0]) * sp[1];
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for (j = 0; j < 3; j++)
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org[j] = r1*u[j] + r2*v[j]
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+ fa->offset*fa->norm[j];
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| 345 |
} while (!inface(org, fa) && nallow-- > 0);
|
| 346 |
if (nallow < 0) {
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| 347 |
objerror(ob, WARNING, "bad aspect");
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| 348 |
rayclean();
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| 349 |
freeface(ob);
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| 350 |
return(my_default(ob, il, nm));
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| 351 |
}
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| 352 |
/* sample source rays */
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| 353 |
srcsamps(il, org, epsilon, ixfm);
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| 354 |
}
|
| 355 |
}
|
| 356 |
/* wait for all rays to finish */
|
| 357 |
rayclean();
|
| 358 |
/* write out the face and its distribution */
|
| 359 |
if (average(il, distarr, n)) {
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| 360 |
if (il->sampdens > 0)
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| 361 |
flatout(il, distarr, nalt, nazi, u, v, fa->norm);
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| 362 |
illumout(il, ob);
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| 363 |
} else
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| 364 |
printobj(il->altmat, ob);
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| 365 |
/* clean up */
|
| 366 |
freeface(ob);
|
| 367 |
return(0);
|
| 368 |
}
|
| 369 |
|
| 370 |
|
| 371 |
int
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| 372 |
my_sphere( /* make an illum sphere */
|
| 373 |
OBJREC *ob,
|
| 374 |
struct illum_args *il,
|
| 375 |
char *nm
|
| 376 |
)
|
| 377 |
{
|
| 378 |
int dim[3];
|
| 379 |
int n, nalt, nazi;
|
| 380 |
double sp[4], r1, r2, r3;
|
| 381 |
FVECT org, dir;
|
| 382 |
FVECT u, v;
|
| 383 |
int i, j;
|
| 384 |
/* check arguments */
|
| 385 |
if (ob->oargs.nfargs != 4)
|
| 386 |
objerror(ob, USER, "bad # of arguments");
|
| 387 |
/* set up sampling */
|
| 388 |
if (il->sampdens <= 0)
|
| 389 |
nalt = nazi = 1;
|
| 390 |
else {
|
| 391 |
n = 4.*PI * il->sampdens;
|
| 392 |
nalt = sqrt(2./PI*n) + .5;
|
| 393 |
nazi = PI/2.*nalt + .5;
|
| 394 |
}
|
| 395 |
n = nalt*nazi;
|
| 396 |
newdist(n);
|
| 397 |
dim[0] = random();
|
| 398 |
/* sample sphere */
|
| 399 |
for (dim[1] = 0; dim[1] < nalt; dim[1]++)
|
| 400 |
for (dim[2] = 0; dim[2] < nazi; dim[2]++)
|
| 401 |
for (i = 0; i < il->nsamps; i++) {
|
| 402 |
/* next sample point */
|
| 403 |
multisamp(sp, 4, urand(ilhash(dim,3)+i));
|
| 404 |
/* random direction */
|
| 405 |
r1 = (dim[1] + sp[0])/nalt;
|
| 406 |
r2 = (dim[2] + sp[1] - .5)/nazi;
|
| 407 |
rounddir(dir, r1, r2);
|
| 408 |
/* random location */
|
| 409 |
mkaxes(u, v, dir); /* yuck! */
|
| 410 |
r3 = sqrt(sp[2]);
|
| 411 |
r2 = 2.*PI*sp[3];
|
| 412 |
r1 = r3*ob->oargs.farg[3]*cos(r2);
|
| 413 |
r2 = r3*ob->oargs.farg[3]*sin(r2);
|
| 414 |
r3 = ob->oargs.farg[3]*sqrt(1.01-r3*r3);
|
| 415 |
for (j = 0; j < 3; j++) {
|
| 416 |
org[j] = ob->oargs.farg[j] + r1*u[j] + r2*v[j] +
|
| 417 |
r3*dir[j];
|
| 418 |
dir[j] = -dir[j];
|
| 419 |
}
|
| 420 |
/* send sample */
|
| 421 |
raysamp(dim[1]*nazi+dim[2], org, dir);
|
| 422 |
}
|
| 423 |
/* wait for all rays to finish */
|
| 424 |
rayclean();
|
| 425 |
/* write out the sphere and its distribution */
|
| 426 |
if (average(il, distarr, n)) {
|
| 427 |
if (il->sampdens > 0)
|
| 428 |
roundout(il, distarr, nalt, nazi);
|
| 429 |
else
|
| 430 |
objerror(ob, WARNING, "diffuse distribution");
|
| 431 |
illumout(il, ob);
|
| 432 |
} else
|
| 433 |
printobj(il->altmat, ob);
|
| 434 |
/* clean up */
|
| 435 |
return(1);
|
| 436 |
}
|
| 437 |
|
| 438 |
|
| 439 |
int
|
| 440 |
my_ring( /* make an illum ring */
|
| 441 |
OBJREC *ob,
|
| 442 |
struct illum_args *il,
|
| 443 |
char *nm
|
| 444 |
)
|
| 445 |
{
|
| 446 |
int dim[2];
|
| 447 |
int n, nalt, nazi, alti;
|
| 448 |
double sp[2], r1, r2, r3;
|
| 449 |
double epsilon;
|
| 450 |
int h;
|
| 451 |
FVECT dn, org, dir;
|
| 452 |
FVECT u, v;
|
| 453 |
MAT4 xfm;
|
| 454 |
CONE *co;
|
| 455 |
int i, j;
|
| 456 |
/* get/check arguments */
|
| 457 |
co = getcone(ob, 0);
|
| 458 |
if (co == NULL)
|
| 459 |
objerror(ob, USER, "cannot create illum");
|
| 460 |
/* set up sampling */
|
| 461 |
if (il->sampdens <= 0) {
|
| 462 |
nalt = nazi = 1; /* diffuse assumption */
|
| 463 |
} else {
|
| 464 |
n = PI * il->sampdens;
|
| 465 |
nalt = sqrt(n/PI) + .5;
|
| 466 |
nazi = PI*nalt + .5;
|
| 467 |
}
|
| 468 |
epsilon = R_EPS*CO_R1(co);
|
| 469 |
n = nazi*nalt;
|
| 470 |
newdist(n);
|
| 471 |
mkaxes(u, v, co->ad);
|
| 472 |
dim[0] = random();
|
| 473 |
/* sample disk */
|
| 474 |
for (dim[1] = 0; dim[1] < n; dim[1]++)
|
| 475 |
for (i = 0; i < il->nsamps; i++) {
|
| 476 |
/* next sample point */
|
| 477 |
h = ilhash(dim,2) + i;
|
| 478 |
/* randomize direction */
|
| 479 |
multisamp(sp, 2, urand(h));
|
| 480 |
alti = dim[1]/nazi;
|
| 481 |
r1 = (alti + sp[0])/nalt;
|
| 482 |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi;
|
| 483 |
flatdir(dn, r1, r2);
|
| 484 |
for (j = 0; j < 3; j++)
|
| 485 |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j];
|
| 486 |
/* randomize location */
|
| 487 |
multisamp(sp, 2, urand(h+8371));
|
| 488 |
r3 = sqrt(CO_R0(co)*CO_R0(co) +
|
| 489 |
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co)));
|
| 490 |
r2 = 2.*PI*sp[1];
|
| 491 |
r1 = r3*cos(r2);
|
| 492 |
r2 = r3*sin(r2);
|
| 493 |
for (j = 0; j < 3; j++)
|
| 494 |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] +
|
| 495 |
epsilon*co->ad[j];
|
| 496 |
/* send sample */
|
| 497 |
raysamp(dim[1], org, dir);
|
| 498 |
}
|
| 499 |
/* add in direct component? */
|
| 500 |
if (il->flags & IL_LIGHT) {
|
| 501 |
MAT4 ixfm;
|
| 502 |
for (i = 3; i--; ) {
|
| 503 |
ixfm[i][0] = u[i];
|
| 504 |
ixfm[i][1] = v[i];
|
| 505 |
ixfm[i][2] = co->ad[i];
|
| 506 |
ixfm[i][3] = 0.;
|
| 507 |
}
|
| 508 |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.;
|
| 509 |
ixfm[3][3] = 1.;
|
| 510 |
dim[0] = random();
|
| 511 |
for (i = 0; i < il->nsamps; i++) {
|
| 512 |
/* randomize location */
|
| 513 |
h = dim[0] + samplendx++;
|
| 514 |
multisamp(sp, 2, urand(h));
|
| 515 |
r3 = sqrt(CO_R0(co)*CO_R0(co) +
|
| 516 |
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co)));
|
| 517 |
r2 = 2.*PI*sp[1];
|
| 518 |
r1 = r3*cos(r2);
|
| 519 |
r2 = r3*sin(r2);
|
| 520 |
for (j = 0; j < 3; j++)
|
| 521 |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j];
|
| 522 |
/* sample source rays */
|
| 523 |
srcsamps(il, org, epsilon, ixfm);
|
| 524 |
}
|
| 525 |
}
|
| 526 |
/* wait for all rays to finish */
|
| 527 |
rayclean();
|
| 528 |
/* write out the ring and its distribution */
|
| 529 |
if (average(il, distarr, n)) {
|
| 530 |
if (il->sampdens > 0)
|
| 531 |
flatout(il, distarr, nalt, nazi, u, v, co->ad);
|
| 532 |
illumout(il, ob);
|
| 533 |
} else
|
| 534 |
printobj(il->altmat, ob);
|
| 535 |
/* clean up */
|
| 536 |
freecone(ob);
|
| 537 |
return(1);
|
| 538 |
}
|
