--- ray/src/gen/mkillum2.c 1991/07/24 12:22:05 1.2 +++ ray/src/gen/mkillum2.c 2007/09/18 19:51:07 2.20 @@ -1,173 +1,404 @@ -/* Copyright (c) 1991 Regents of the University of California */ - #ifndef lint -static char SCCSid[] = "$SunId$ LBL"; +static const char RCSid[] = "$Id: mkillum2.c,v 2.20 2007/09/18 19:51:07 greg Exp $"; #endif - /* - * Routines to do the actual calcultion and output for mkillum + * Routines to do the actual calculation for mkillum */ -#include "mkillum.h" +#include +#include "mkillum.h" #include "face.h" - #include "cone.h" - #include "random.h" -printobj(mod, obj) /* print out an object */ -char *mod; -register OBJREC *obj; -{ - register int i; +static void mkaxes(FVECT u, FVECT v, FVECT n); +static void rounddir(FVECT dv, double alt, double azi); +static void flatdir(FVECT dv, double alt, double azi); - printf("\n%s %s %s", mod, ofun[obj->otype].funame, obj->oname); - printf("\n%d", obj->oargs.nsargs); - for (i = 0; i < obj->oargs.nsargs; i++) - printf(" %s", obj->oargs.sarg[i]); -#ifdef IARGS - printf("\n%d", obj->oargs.niargs); - for (i = 0; i < obj->oargs.niargs; i++) - printf(" %d", obj->oargs.iarg[i]); -#else - printf("\n0"); -#endif - printf("\n%d", obj->oargs.nfargs); - for (i = 0; i < obj->oargs.nfargs; i++) { - if (i%3 == 0) - putchar('\n'); - printf(" %18.12g", obj->oargs.farg[i]); + +static COLORV * distarr = NULL; /* distribution array */ +static int distsiz = 0; + + +static void +newdist( /* allocate & clear distribution array */ + int siz +) +{ + if (siz == 0) { + if (distsiz > 0) + free((void *)distarr); + distarr = NULL; + distsiz = 0; + return; } - putchar('\n'); + if (distsiz < siz) { + free((void *)distarr); + distarr = (COLORV *)malloc(sizeof(COLORV)*3*siz); + if (distarr == NULL) + error(SYSTEM, "out of memory in newdist"); + distsiz = siz; + } + memset(distarr, '\0', sizeof(COLORV)*3*siz); } -o_default(ob, il, rt, nm) /* default illum action */ -OBJREC *ob; -struct illum_args *il; -struct rtproc *rt; -char *nm; +static int +process_ray(RAY *r, int rv) { + COLORV *colp; + + if (rv == 0) + return(0); + if (rv < 0) + error(USER, "ray tracing process died"); + if (r->rno >= distsiz) + error(INTERNAL, "bad returned index in process_ray"); + colp = &distarr[r->rno * 3]; + addcolor(colp, r->rcol); + return(1); +} + + +static void +raysamp( /* queue a ray sample */ + int ndx, + FVECT org, + FVECT dir +) +{ + RAY myRay; + int rv; + + if ((ndx < 0) | (ndx >= distsiz)) + error(INTERNAL, "bad index in raysamp"); + VCOPY(myRay.rorg, org); + VCOPY(myRay.rdir, dir); + myRay.rmax = .0; + rayorigin(&myRay, PRIMARY, NULL, NULL); + myRay.rno = ndx; + /* queue ray, check result */ + process_ray(&myRay, ray_pqueue(&myRay)); +} + + +static void +rayclean() /* finish all pending rays */ +{ + RAY myRay; + + while (process_ray(&myRay, ray_presult(&myRay, 0))) + ; +} + + +int +my_default( /* default illum action */ + OBJREC *ob, + struct illum_args *il, + char *nm +) +{ sprintf(errmsg, "(%s): cannot make illum for %s \"%s\"", nm, ofun[ob->otype].funame, ob->oname); error(WARNING, errmsg); - if (!(il->flags & IL_LIGHT)) - printobj(il->altname, ob); + printobj(il->altmat, ob); + return(1); } -o_face(ob, il, rt, nm) /* make an illum face */ -OBJREC *ob; -struct illum_args *il; -struct rtproc *rt; -char *nm; +int +my_face( /* make an illum face */ + OBJREC *ob, + struct illum_args *il, + char *nm +) { +#define MAXMISS (5*n*il->nsamps) + int dim[3]; + int n, nalt, nazi, h; + double sp[2], r1, r2; + FVECT dn, org, dir; + FVECT u, v; + double ur[2], vr[2]; + int nmisses; + register FACE *fa; + register int i, j; + /* get/check arguments */ + fa = getface(ob); + if (fa->area == 0.0) { + freeface(ob); + return(my_default(ob, il, nm)); + } + /* set up sampling */ + if (il->sampdens <= 0) + nalt = nazi = 1; + else { + n = PI * il->sampdens; + nalt = sqrt(n/PI) + .5; + nazi = PI*nalt + .5; + } + n = nalt*nazi; + newdist(n); + /* take first edge >= sqrt(area) */ + for (j = fa->nv-1, i = 0; i < fa->nv; j = i++) { + u[0] = VERTEX(fa,i)[0] - VERTEX(fa,j)[0]; + u[1] = VERTEX(fa,i)[1] - VERTEX(fa,j)[1]; + u[2] = VERTEX(fa,i)[2] - VERTEX(fa,j)[2]; + if ((r1 = DOT(u,u)) >= fa->area-FTINY) + break; + } + if (i < fa->nv) { /* got one! -- let's align our axes */ + r2 = 1.0/sqrt(r1); + u[0] *= r2; u[1] *= r2; u[2] *= r2; + fcross(v, fa->norm, u); + } else /* oh well, we'll just have to wing it */ + mkaxes(u, v, fa->norm); + /* now, find limits in (u,v) coordinates */ + ur[0] = vr[0] = FHUGE; + ur[1] = vr[1] = -FHUGE; + for (i = 0; i < fa->nv; i++) { + r1 = DOT(VERTEX(fa,i),u); + if (r1 < ur[0]) ur[0] = r1; + if (r1 > ur[1]) ur[1] = r1; + r2 = DOT(VERTEX(fa,i),v); + if (r2 < vr[0]) vr[0] = r2; + if (r2 > vr[1]) vr[1] = r2; + } + dim[0] = random(); + /* sample polygon */ + nmisses = 0; + for (dim[1] = 0; dim[1] < nalt; dim[1]++) + for (dim[2] = 0; dim[2] < nazi; dim[2]++) + for (i = 0; i < il->nsamps; i++) { + /* random direction */ + h = ilhash(dim, 3) + i; + multisamp(sp, 2, urand(h)); + r1 = (dim[1] + sp[0])/nalt; + r2 = (dim[2] + sp[1] - .5)/nazi; + flatdir(dn, r1, r2); + for (j = 0; j < 3; j++) + dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*fa->norm[j]; + /* random location */ + do { + multisamp(sp, 2, urand(h+4862+nmisses)); + r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; + r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; + for (j = 0; j < 3; j++) + org[j] = r1*u[j] + r2*v[j] + + fa->offset*fa->norm[j]; + } while (!inface(org, fa) && nmisses++ < MAXMISS); + if (nmisses > MAXMISS) { + objerror(ob, WARNING, "bad aspect"); + rayclean(); + freeface(ob); + free((void *)distarr); + return(my_default(ob, il, nm)); + } + for (j = 0; j < 3; j++) + org[j] += .0001*fa->norm[j]; + /* send sample */ + raysamp(dim[1]*nazi+dim[2], org, dir); + } + rayclean(); + /* write out the face and its distribution */ + if (average(il, distarr, nalt*nazi)) { + if (il->sampdens > 0) + flatout(il, distarr, nalt, nazi, u, v, fa->norm); + illumout(il, ob); + } else + printobj(il->altmat, ob); + /* clean up */ + freeface(ob); + return(0); +#undef MAXMISS } -o_sphere(ob, il, rt, nm) /* make an illum sphere */ -OBJREC *ob; -struct illum_args *il; -struct rtproc *rt; -char *nm; +int +my_sphere( /* make an illum sphere */ + register OBJREC *ob, + struct illum_args *il, + char *nm +) { - int dim[4]; + int dim[3]; int n, nalt, nazi; - float *distarr; - double r1, r2; - FVECT pos, dir; + double sp[4], r1, r2, r3; + FVECT org, dir; FVECT u, v; register int i, j; /* check arguments */ if (ob->oargs.nfargs != 4) objerror(ob, USER, "bad # of arguments"); /* set up sampling */ - n = 4.*PI * il->sampdens; - nalt = sqrt(n/PI) + .5; - nazi = PI*nalt + .5; + if (il->sampdens <= 0) + nalt = nazi = 1; + else { + n = 4.*PI * il->sampdens; + nalt = sqrt(2./PI*n) + .5; + nazi = PI/2.*nalt + .5; + } n = nalt*nazi; - distarr = (float *)calloc(n, 3*sizeof(float)); - if (distarr == NULL) - error(SYSTEM, "out of memory in o_sphere"); + newdist(n); dim[0] = random(); /* sample sphere */ for (dim[1] = 0; dim[1] < nalt; dim[1]++) for (dim[2] = 0; dim[2] < nazi; dim[2]++) for (i = 0; i < il->nsamps; i++) { + /* next sample point */ + multisamp(sp, 4, urand(ilhash(dim,3)+i)); /* random direction */ - dim[3] = 1; - r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt; - dim[3] = 2; - r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nalt; + r1 = (dim[1] + sp[0])/nalt; + r2 = (dim[2] + sp[1] - .5)/nazi; rounddir(dir, r1, r2); /* random location */ mkaxes(u, v, dir); /* yuck! */ - dim[3] = 3; - r1 = sqrt(urand(urind(ilhash(dim,4),i))); - dim[3] = 4; - r2 = 2.*PI*urand(urind(ilhash(dim,4),i)); - for (j = 0; j < 3; j++) - org[j] = obj->oargs.farg[j] + obj->oargs.farg[3] * - ( r1*cos(r2)*u[j] + r1*sin(r2)*v[j] - - sqrt(1.01-r1*r1)*dir[j] ); + r3 = sqrt(sp[2]); + r2 = 2.*PI*sp[3]; + r1 = r3*ob->oargs.farg[3]*cos(r2); + r2 = r3*ob->oargs.farg[3]*sin(r2); + r3 = ob->oargs.farg[3]*sqrt(1.01-r3*r3); + for (j = 0; j < 3; j++) { + org[j] = ob->oargs.farg[j] + r1*u[j] + r2*v[j] + + r3*dir[j]; + dir[j] = -dir[j]; + } + /* send sample */ + raysamp(dim[1]*nazi+dim[2], org, dir); + } + rayclean(); + /* write out the sphere and its distribution */ + if (average(il, distarr, nalt*nazi)) { + if (il->sampdens > 0) + roundout(il, distarr, nalt, nazi); + else + objerror(ob, WARNING, "diffuse distribution"); + illumout(il, ob); + } else + printobj(il->altmat, ob); + /* clean up */ + return(1); +} + +int +my_ring( /* make an illum ring */ + OBJREC *ob, + struct illum_args *il, + char *nm +) +{ + int dim[3]; + int n, nalt, nazi; + double sp[4], r1, r2, r3; + FVECT dn, org, dir; + FVECT u, v; + register CONE *co; + register int i, j; + /* get/check arguments */ + co = getcone(ob, 0); + /* set up sampling */ + if (il->sampdens <= 0) + nalt = nazi = 1; + else { + n = PI * il->sampdens; + nalt = sqrt(n/PI) + .5; + nazi = PI*nalt + .5; + } + n = nalt*nazi; + newdist(n); + mkaxes(u, v, co->ad); + dim[0] = random(); + /* sample disk */ + for (dim[1] = 0; dim[1] < nalt; dim[1]++) + for (dim[2] = 0; dim[2] < nazi; dim[2]++) + for (i = 0; i < il->nsamps; i++) { + /* next sample point */ + multisamp(sp, 4, urand(ilhash(dim,3)+i)); + /* random direction */ + r1 = (dim[1] + sp[0])/nalt; + r2 = (dim[2] + sp[1] - .5)/nazi; + flatdir(dn, r1, r2); + for (j = 0; j < 3; j++) + dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; + /* random location */ + r3 = sqrt(CO_R0(co)*CO_R0(co) + + sp[2]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); + r2 = 2.*PI*sp[3]; + r1 = r3*cos(r2); + r2 = r3*sin(r2); + for (j = 0; j < 3; j++) + org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + + .0001*co->ad[j]; /* send sample */ - raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt); + raysamp(dim[1]*nazi+dim[2], org, dir); } - rayflush(rt); - /* write out distribution */ - rounddist(distarr, nalt, nazi, il, ob); + rayclean(); + /* write out the ring and its distribution */ + if (average(il, distarr, nalt*nazi)) { + if (il->sampdens > 0) + flatout(il, distarr, nalt, nazi, u, v, co->ad); + illumout(il, ob); + } else + printobj(il->altmat, ob); /* clean up */ - free((char *)distarr); + freecone(ob); + return(1); } -o_ring(ob, il, rt, nm) /* make an illum ring */ -OBJREC *ob; -struct illum_args *il; -struct rtproc *rt; -char *nm; +static void +mkaxes( /* compute u and v to go with n */ + FVECT u, + FVECT v, + FVECT n +) { + register int i; + + v[0] = v[1] = v[2] = 0.0; + for (i = 0; i < 3; i++) + if (n[i] < 0.6 && n[i] > -0.6) + break; + v[i] = 1.0; + fcross(u, v, n); + normalize(u); + fcross(v, n, u); } -raysamp(res, org, dir, rt) /* compute a ray sample */ -float res[3]; -FVECT org, dir; -register struct rtproc *rt; +static void +rounddir( /* compute uniform spherical direction */ + register FVECT dv, + double alt, + double azi +) { - register float *fp; + double d1, d2; - if (rt->nrays == rt->bsiz) - rayflush(rt); - rt->dest[rt->nrays] = res; - fp = rt->buf + 6*rt->nrays++; - *fp++ = org[0]; *fp++ = org[1]; *fp++ = org[2]; - *fp++ = dir[0]; *fp++ = dir[1]; *fp = dir[2]; + dv[2] = 1. - 2.*alt; + d1 = sqrt(1. - dv[2]*dv[2]); + d2 = 2.*PI * azi; + dv[0] = d1*cos(d2); + dv[1] = d1*sin(d2); } -rayflush(rt) /* flush buffered rays */ -register struct rtproc *rt; +static void +flatdir( /* compute uniform hemispherical direction */ + register FVECT dv, + double alt, + double azi +) { - register int i; + double d1, d2; - if (rt->nrays <= 0) - return; - i = 6*rt->nrays + 3; - rt->buf[i++] = 0.; rt->buf[i++] = 0.; rt->buf[i] = 0.; - if ( process(rt->pd, (char *)rt->buf, (char *)rt->buf, - 3*sizeof(float)*rt->nrays, - 6*sizeof(float)*(rt->nrays+1)) < - 3*sizeof(float)*rt->nrays ) - error(SYSTEM, "error reading from rtrace process"); - i = rt->nrays; - while (i--) { - rt->dest[i][0] += rt->buf[3*i]; - rt->dest[i][1] += rt->buf[3*i+1]; - rt->dest[i][2] += rt->buf[3*i+2]; - } - rt->nrays = 0; + d1 = sqrt(alt); + d2 = 2.*PI * azi; + dv[0] = d1*cos(d2); + dv[1] = d1*sin(d2); + dv[2] = sqrt(1. - alt); }