--- ray/src/gen/mkillum2.c 1991/07/24 12:22:05 1.2 +++ ray/src/gen/mkillum2.c 1991/07/25 12:52:18 1.6 @@ -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; @@ -54,7 +27,7 @@ char *nm; nm, ofun[ob->otype].funame, ob->oname); error(WARNING, errmsg); if (!(il->flags & IL_LIGHT)) - printobj(il->altname, ob); + printobj(il->altmat, ob); } @@ -64,11 +37,95 @@ struct illum_args *il; struct rtproc *rt; char *nm; { +#define MAXMISS (5*n*il->nsamps) + int dim[4]; + int n, nalt, nazi; + float *distarr; + double 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 */ + 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"); + mkaxes(u, v, fa->norm); + 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 */ + 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)))/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 { + dim[3] = 3; + r1 = ur[0] + (ur[1]-ur[0]) * + urand(urind(ilhash(dim,4),i+nmisses)); + dim[3] = 4; + r2 = vr[0] + (vr[1]-vr[0]) * + urand(urind(ilhash(dim,4),i+nmisses)); + 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+dim[1]*nazi+dim[2], org, dir, rt); + } + rayflush(rt); + /* write out the face w/ distribution */ + flatout(il, distarr, nalt, nazi, u, v, fa->norm); + illumout(il, 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; @@ -76,8 +133,8 @@ char *nm; int dim[4]; int n, nalt, nazi; float *distarr; - double r1, r2; - FVECT pos, dir; + double r1, r2, r3; + FVECT org, dir; FVECT u, v; register int i, j; /* check arguments */ @@ -94,31 +151,41 @@ char *nm; dim[0] = random(); /* sample sphere */ for (dim[1] = 0; dim[1] < nalt; dim[1]++) - for (dim[2] = 0; dim[2] < nazi; dim[2]++) + for (dim[2] = 0; dim[2] < nazi; dim[2]++) { + if (il->nsamps > 2 && nazi > 20) { + rounddir(dir, (dim[1]+.5)/nalt, (dim[2]+.5)/nazi); + mkaxes(u, v, dir); + } for (i = 0; i < il->nsamps; 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; + r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nazi; rounddir(dir, r1, r2); /* random location */ - mkaxes(u, v, dir); /* yuck! */ + if (il->nsamps <= 2 || nazi <= 20) + mkaxes(u, v, dir); /* yuck! */ dim[3] = 3; - r1 = sqrt(urand(urind(ilhash(dim,4),i))); + r3 = 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] ); - + 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); } + } rayflush(rt); - /* write out distribution */ - rounddist(distarr, nalt, nazi, il, ob); + /* write out the sphere w/ distribution */ + roundout(il, distarr, nalt, nazi); + illumout(il, ob); /* clean up */ free((char *)distarr); } @@ -130,6 +197,61 @@ struct illum_args *il; struct rtproc *rt; char *nm; { + int dim[4]; + int n, nalt, nazi; + float *distarr; + double 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 */ + 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++) { + /* 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; + 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 */ + dim[3] = 3; + r3 = sqrt(CO_R0(co)*CO_R0(co) + + urand(urind(ilhash(dim,4),i))* + (CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); + dim[3] = 4; + r2 = 2.*PI*urand(urind(ilhash(dim,4),i)); + r1 = r3*cos(r2); + r2 = r3*sin(r2); + for (j = 0; j < 3; j++) + org[j] = CO_P0(co)[j] + r1*u[j] + r1*v[j] + + .001*co->ad[j]; + + /* send sample */ + raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt); + } + rayflush(rt); + /* write out the ring w/ distribution */ + flatout(il, distarr, nalt, nazi, u, v, co->ad); + illumout(il, ob); + /* clean up */ + freecone(ob); + free((char *)distarr); } @@ -170,4 +292,48 @@ 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); }