--- ray/src/gen/mkillum2.c 1991/07/24 12:22:05 1.2 +++ ray/src/gen/mkillum2.c 1994/01/07 14:51:46 2.6 @@ -5,7 +5,7 @@ static char SCCSid[] = "$SunId$ LBL"; #endif /* - * Routines to do the actual calcultion and output for mkillum + * Routines to do the actual calculation for mkillum */ #include "mkillum.h" @@ -17,33 +17,6 @@ static char SCCSid[] = "$SunId$ LBL"; #include "random.h" -printobj(mod, obj) /* print out an object */ -char *mod; -register OBJREC *obj; -{ - register int i; - - 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]); - } - putchar('\n'); -} - - o_default(ob, il, rt, nm) /* default illum action */ OBJREC *ob; struct illum_args *il; @@ -53,8 +26,7 @@ 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); } @@ -64,29 +36,136 @@ struct illum_args *il; struct rtproc *rt; char *nm; { +#define MAXMISS (5*n*il->nsamps) + int dim[3]; + int n, nalt, nazi, h; + float *distarr; + 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); + o_default(ob, il, rt, nm); + return; + } + /* 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; + distarr = (float *)calloc(n, 3*sizeof(float)); + if (distarr == NULL) + error(SYSTEM, "out of memory in o_face"); + /* take first edge longer than 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"); + rt->nrays = 0; + freeface(ob); + free((char *)distarr); + o_default(ob, il, rt, nm); + return; + } + for (j = 0; j < 3; j++) + org[j] += .001*fa->norm[j]; + /* send sample */ + raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); + } + rayflush(rt); + /* 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); + free((char *)distarr); +#undef MAXMISS } o_sphere(ob, il, rt, nm) /* make an illum sphere */ -OBJREC *ob; +register OBJREC *ob; struct illum_args *il; struct rtproc *rt; 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(n/PI) + .5; + nazi = PI*nalt + .5; + } n = nalt*nazi; distarr = (float *)calloc(n, 3*sizeof(float)); if (distarr == NULL) @@ -96,29 +175,37 @@ char *nm; 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(distarr+dim[1]*nazi+dim[2], org, dir, rt); + raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); } rayflush(rt); - /* write out distribution */ - rounddist(distarr, nalt, nazi, il, ob); + /* 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 */ free((char *)distarr); } @@ -130,6 +217,66 @@ struct illum_args *il; struct rtproc *rt; char *nm; { + int dim[3]; + int n, nalt, nazi; + float *distarr; + 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; + distarr = (float *)calloc(n, 3*sizeof(float)); + if (distarr == NULL) + error(SYSTEM, "out of memory in o_ring"); + 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] + + .001*co->ad[j]; + + /* send sample */ + raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); + } + rayflush(rt); + /* 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 */ + freecone(ob); + free((char *)distarr); } @@ -156,8 +303,8 @@ register struct rtproc *rt; if (rt->nrays <= 0) return; - i = 6*rt->nrays + 3; - rt->buf[i++] = 0.; rt->buf[i++] = 0.; rt->buf[i] = 0.; + bzero(rt->buf+6*rt->nrays, 6*sizeof(float)); + errno = 0; if ( process(rt->pd, (char *)rt->buf, (char *)rt->buf, 3*sizeof(float)*rt->nrays, 6*sizeof(float)*(rt->nrays+1)) < @@ -170,4 +317,48 @@ register struct rtproc *rt; rt->dest[i][2] += rt->buf[3*i+2]; } rt->nrays = 0; +} + + +mkaxes(u, v, n) /* compute u and v to go with n */ +FVECT u, v, 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); +} + + +rounddir(dv, alt, azi) /* compute uniform spherical direction */ +register FVECT dv; +double alt, azi; +{ + double d1, d2; + + 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); +} + + +flatdir(dv, alt, azi) /* compute uniform hemispherical direction */ +register FVECT dv; +double alt, azi; +{ + double d1, d2; + + d1 = sqrt(alt); + d2 = 2.*PI * azi; + dv[0] = d1*cos(d2); + dv[1] = d1*sin(d2); + dv[2] = sqrt(1. - alt); }