--- ray/src/gen/mkillum2.c 1991/07/25 12:52:18 1.6 +++ ray/src/gen/mkillum2.c 2004/03/30 20:40:04 2.15 @@ -1,47 +1,58 @@ -/* Copyright (c) 1991 Regents of the University of California */ - #ifndef lint -static char SCCSid[] = "$SunId$ LBL"; +static const char RCSid[] = "$Id: mkillum2.c,v 2.15 2004/03/30 20:40:04 greg Exp $"; #endif - /* * Routines to do the actual calculation for mkillum */ -#include "mkillum.h" +#include +#include "mkillum.h" #include "face.h" - #include "cone.h" - #include "random.h" -o_default(ob, il, rt, nm) /* default illum action */ -OBJREC *ob; -struct illum_args *il; -struct rtproc *rt; -char *nm; +int o_default(FUN_ARGLIST); +int o_face(FUN_ARGLIST); +int o_sphere(FUN_ARGLIST); +int o_ring(FUN_ARGLIST); +void raysamp(float res[3], FVECT org, FVECT dir, struct rtproc *rt); +void rayflush(struct rtproc *rt); +void mkaxes(FVECT u, FVECT v, FVECT n); +void rounddir(FVECT dv, double alt, double azi); +void flatdir(FVECT dv, double alt, double azi); + + +int /* XXX type conflict with otypes.h */ +o_default( /* default illum action */ + OBJREC *ob, + struct illum_args *il, + struct rtproc *rt, + 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->altmat, 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 +o_face( /* make an illum face */ + OBJREC *ob, + struct illum_args *il, + struct rtproc *rt, + char *nm +) { #define MAXMISS (5*n*il->nsamps) - int dim[4]; - int n, nalt, nazi; + int dim[3]; + int n, nalt, nazi, h; float *distarr; - double r1, r2; + double sp[2], r1, r2; FVECT dn, org, dir; FVECT u, v; double ur[2], vr[2]; @@ -52,18 +63,35 @@ char *nm; fa = getface(ob); if (fa->area == 0.0) { freeface(ob); - o_default(ob, il, rt, nm); - return; + return(o_default(ob, il, rt, nm)); } /* set up sampling */ - n = PI * il->sampdens; - nalt = sqrt(n/PI) + .5; - nazi = PI*nalt + .5; + 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"); - mkaxes(u, v, fa->norm); + /* 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++) { @@ -81,21 +109,18 @@ char *nm; 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; + 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 { - 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)); + 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]; @@ -104,36 +129,42 @@ char *nm; objerror(ob, WARNING, "bad aspect"); rt->nrays = 0; freeface(ob); - free((char *)distarr); - o_default(ob, il, rt, nm); - return; + free((void *)distarr); + return(o_default(ob, il, rt, nm)); } for (j = 0; j < 3; j++) org[j] += .001*fa->norm[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 the face w/ distribution */ - flatout(il, distarr, nalt, nazi, u, v, fa->norm); - illumout(il, ob); + /* 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); + free((void *)distarr); + return(0); #undef MAXMISS } -o_sphere(ob, il, rt, nm) /* make an illum sphere */ -register OBJREC *ob; -struct illum_args *il; -struct rtproc *rt; -char *nm; +int +o_sphere( /* make an illum sphere */ + 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, r3; + double sp[4], r1, r2, r3; FVECT org, dir; FVECT u, v; register int i, j; @@ -141,9 +172,13 @@ char *nm; 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) @@ -151,25 +186,18 @@ 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]++) { - if (il->nsamps > 2 && nazi > 20) { - rounddir(dir, (dim[1]+.5)/nalt, (dim[2]+.5)/nazi); - mkaxes(u, v, dir); - } + 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)))/nazi; + r1 = (dim[1] + sp[0])/nalt; + r2 = (dim[2] + sp[1] - .5)/nazi; rounddir(dir, r1, r2); /* random location */ - if (il->nsamps <= 2 || nazi <= 20) - mkaxes(u, v, dir); /* yuck! */ - dim[3] = 3; - r3 = sqrt(urand(urind(ilhash(dim,4),i))); - dim[3] = 4; - r2 = 2.*PI*urand(urind(ilhash(dim,4),i)); + mkaxes(u, v, dir); /* yuck! */ + 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); @@ -179,28 +207,36 @@ char *nm; 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 the sphere w/ distribution */ - roundout(il, distarr, nalt, nazi); - illumout(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); + free((void *)distarr); + return(1); } -o_ring(ob, il, rt, nm) /* make an illum ring */ -OBJREC *ob; -struct illum_args *il; -struct rtproc *rt; -char *nm; +int +o_ring( /* make an illum ring */ + 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, r3; + double sp[4], r1, r2, r3; FVECT dn, org, dir; FVECT u, v; register CONE *co; @@ -208,9 +244,13 @@ char *nm; /* get/check arguments */ co = getcone(ob, 0); /* set up sampling */ - n = PI * il->sampdens; - nalt = sqrt(n/PI) + .5; - nazi = PI*nalt + .5; + 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) @@ -221,44 +261,49 @@ 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; 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)); + 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] + r1*v[j] + + org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + .001*co->ad[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 the ring w/ distribution */ - flatout(il, distarr, nalt, nazi, u, v, co->ad); - illumout(il, ob); + /* 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); + free((void *)distarr); + return(1); } -raysamp(res, org, dir, rt) /* compute a ray sample */ -float res[3]; -FVECT org, dir; -register struct rtproc *rt; +void +raysamp( /* compute a ray sample */ + float res[3], + FVECT org, + FVECT dir, + register struct rtproc *rt +) { register float *fp; @@ -271,19 +316,21 @@ register struct rtproc *rt; } -rayflush(rt) /* flush buffered rays */ -register struct rtproc *rt; +void +rayflush( /* flush buffered rays */ + register struct rtproc *rt +) { register int i; 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, + memset(rt->buf+6*rt->nrays, '\0', 6*sizeof(float)); + errno = 0; + if ( process(&(rt->pd), (char *)rt->buf, (char *)rt->buf, + 3*sizeof(float)*(rt->nrays+1), 6*sizeof(float)*(rt->nrays+1)) < - 3*sizeof(float)*rt->nrays ) + 3*sizeof(float)*(rt->nrays+1) ) error(SYSTEM, "error reading from rtrace process"); i = rt->nrays; while (i--) { @@ -295,8 +342,12 @@ register struct rtproc *rt; } -mkaxes(u, v, n) /* compute u and v to go with n */ -FVECT u, v, n; +void +mkaxes( /* compute u and v to go with n */ + FVECT u, + FVECT v, + FVECT n +) { register int i; @@ -311,9 +362,12 @@ FVECT u, v, n; } -rounddir(dv, alt, azi) /* compute uniform spherical direction */ -register FVECT dv; -double alt, azi; +void +rounddir( /* compute uniform spherical direction */ + register FVECT dv, + double alt, + double azi +) { double d1, d2; @@ -325,9 +379,12 @@ double alt, azi; } -flatdir(dv, alt, azi) /* compute uniform hemispherical direction */ -register FVECT dv; -double alt, azi; +void +flatdir( /* compute uniform hemispherical direction */ + register FVECT dv, + double alt, + double azi +) { double d1, d2;