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/* Copyright (c) 1991 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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|
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/* |
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* Routines to do the actual calcultion and output for mkillum |
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* Routines to do the actual calculation for mkillum |
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*/ |
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#include "mkillum.h" |
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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 "random.h" |
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printobj(mod, obj) /* print out an object */ |
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char *mod; |
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register OBJREC *obj; |
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{ |
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register int i; |
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int o_default(FUN_ARGLIST); |
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int o_face(FUN_ARGLIST); |
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int o_sphere(FUN_ARGLIST); |
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int o_ring(FUN_ARGLIST); |
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void raysamp(float res[3], FVECT org, FVECT dir, struct rtproc *rt); |
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void rayflush(struct rtproc *rt); |
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void mkaxes(FVECT u, FVECT v, FVECT n); |
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void rounddir(FVECT dv, double alt, double azi); |
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void flatdir(FVECT dv, double alt, double azi); |
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|
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printf("\n%s %s %s", mod, ofun[obj->otype].funame, obj->oname); |
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printf("\n%d", obj->oargs.nsargs); |
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for (i = 0; i < obj->oargs.nsargs; i++) |
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printf(" %s", obj->oargs.sarg[i]); |
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#ifdef IARGS |
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printf("\n%d", obj->oargs.niargs); |
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for (i = 0; i < obj->oargs.niargs; i++) |
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printf(" %d", obj->oargs.iarg[i]); |
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#else |
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printf("\n0"); |
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#endif |
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printf("\n%d", obj->oargs.nfargs); |
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for (i = 0; i < obj->oargs.nfargs; i++) { |
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if (i%3 == 0) |
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putchar('\n'); |
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printf(" %18.12g", obj->oargs.farg[i]); |
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} |
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putchar('\n'); |
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} |
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o_default(ob, il, rt, nm) /* default illum action */ |
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OBJREC *ob; |
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struct illum_args *il; |
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struct rtproc *rt; |
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char *nm; |
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int /* XXX type conflict with otypes.h */ |
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o_default( /* default illum action */ |
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OBJREC *ob, |
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struct illum_args *il, |
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struct rtproc *rt, |
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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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if (!(il->flags & IL_LIGHT)) |
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printobj(il->altname, ob); |
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printobj(il->altmat, ob); |
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return(1); |
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} |
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o_face(ob, il, rt, nm) /* make an illum face */ |
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OBJREC *ob; |
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struct illum_args *il; |
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struct rtproc *rt; |
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char *nm; |
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int |
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o_face( /* make an illum face */ |
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OBJREC *ob, |
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struct illum_args *il, |
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struct rtproc *rt, |
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char *nm |
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) |
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{ |
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#define MAXMISS (5*n*il->nsamps) |
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int dim[4]; |
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int n, nalt, nazi; |
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int dim[3]; |
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int n, nalt, nazi, h; |
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float *distarr; |
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double r1, r2; |
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FVECT dn, pos, dir; |
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double sp[2], r1, r2; |
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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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int nmisses; |
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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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o_default(ob, il, rt, nm); |
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return; |
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return(o_default(ob, il, rt, nm)); |
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} |
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/* set up sampling */ |
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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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if (il->sampdens <= 0) |
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nalt = nazi = 1; |
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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 = nalt*nazi; |
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distarr = (float *)calloc(n, 3*sizeof(float)); |
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if (distarr == NULL) |
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error(SYSTEM, "out of memory in o_face"); |
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mkaxes(u, v, fa->norm); |
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/* take first edge longer than 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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for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
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for (i = 0; i < il->nsamps; i++) { |
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/* random direction */ |
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dim[3] = 1; |
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r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt; |
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dim[3] = 2; |
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r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nalt; |
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h = ilhash(dim, 3) + i; |
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multisamp(sp, 2, urand(h)); |
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r1 = (dim[1] + sp[0])/nalt; |
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r2 = (dim[2] + 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] - dn[2]*fa->norm[j]; |
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dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*fa->norm[j]; |
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/* random location */ |
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do { |
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dim[3] = 3; |
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r1 = ur[0] + |
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(ur[1]-ur[0])*urand(urind(ilhash(dim,4),i)); |
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dim[3] = 4; |
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r2 = vr[0] + |
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(vr[1]-vr[0])*urand(urind(ilhash(dim,4),i)); |
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multisamp(sp, 2, urand(h+4862+nmisses)); |
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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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objerror(ob, WARNING, "bad aspect"); |
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rt->nrays = 0; |
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freeface(ob); |
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free((char *)distarr); |
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o_default(ob, il, rt, nm); |
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return; |
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free((void *)distarr); |
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return(o_default(ob, il, rt, nm)); |
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} |
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for (j = 0; j < 3; j++) |
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org[j] += .001*fa->norm[j]; |
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/* send sample */ |
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raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt); |
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raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
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} |
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rayflush(rt); |
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/* write out the distribution */ |
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flatdist(distarr, nalt, nazi, il, ob); |
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/* write out the face and its distribution */ |
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if (average(il, distarr, nalt*nazi)) { |
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if (il->sampdens > 0) |
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flatout(il, distarr, nalt, nazi, u, v, fa->norm); |
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illumout(il, ob); |
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} else |
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printobj(il->altmat, ob); |
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/* clean up */ |
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freeface(ob); |
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free((char *)distarr); |
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free((void *)distarr); |
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#undef MAXMISS |
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} |
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o_sphere(ob, il, rt, nm) /* make an illum sphere */ |
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register OBJREC *ob; |
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struct illum_args *il; |
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struct rtproc *rt; |
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char *nm; |
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int |
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o_sphere( /* make an illum sphere */ |
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register OBJREC *ob, |
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struct illum_args *il, |
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struct rtproc *rt, |
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char *nm |
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) |
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{ |
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int dim[4]; |
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int dim[3]; |
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int n, nalt, nazi; |
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float *distarr; |
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double r1, r2; |
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FVECT pos, dir; |
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double sp[4], r1, r2, r3; |
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FVECT org, dir; |
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FVECT u, v; |
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register int i, j; |
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/* check arguments */ |
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if (ob->oargs.nfargs != 4) |
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objerror(ob, USER, "bad # of arguments"); |
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/* set up sampling */ |
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n = 4.*PI * il->sampdens; |
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nalt = sqrt(n/PI) + .5; |
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nazi = PI*nalt + .5; |
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if (il->sampdens <= 0) |
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nalt = nazi = 1; |
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else { |
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n = 4.*PI * il->sampdens; |
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nalt = sqrt(2./PI*n) + .5; |
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nazi = PI/2.*nalt + .5; |
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} |
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n = nalt*nazi; |
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distarr = (float *)calloc(n, 3*sizeof(float)); |
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if (distarr == NULL) |
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for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
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for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
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for (i = 0; i < il->nsamps; i++) { |
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/* next sample point */ |
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multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
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/* random direction */ |
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dim[3] = 1; |
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r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt; |
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dim[3] = 2; |
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r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nalt; |
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r1 = (dim[1] + sp[0])/nalt; |
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r2 = (dim[2] + sp[1] - .5)/nazi; |
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rounddir(dir, r1, r2); |
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/* random location */ |
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mkaxes(u, v, dir); /* yuck! */ |
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dim[3] = 3; |
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r1 = sqrt(urand(urind(ilhash(dim,4),i))); |
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dim[3] = 4; |
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r2 = 2.*PI*urand(urind(ilhash(dim,4),i)); |
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for (j = 0; j < 3; j++) |
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org[j] = obj->oargs.farg[j] + obj->oargs.farg[3] * |
204 |
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( r1*cos(r2)*u[j] + r1*sin(r2)*v[j] |
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- sqrt(1.01-r1*r1)*dir[j] ); |
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|
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r3 = sqrt(sp[2]); |
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r2 = 2.*PI*sp[3]; |
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r1 = r3*ob->oargs.farg[3]*cos(r2); |
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r2 = r3*ob->oargs.farg[3]*sin(r2); |
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r3 = ob->oargs.farg[3]*sqrt(1.01-r3*r3); |
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for (j = 0; j < 3; j++) { |
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org[j] = ob->oargs.farg[j] + r1*u[j] + r2*v[j] + |
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r3*dir[j]; |
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dir[j] = -dir[j]; |
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} |
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/* send sample */ |
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raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt); |
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raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
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} |
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rayflush(rt); |
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/* write out the distribution */ |
213 |
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rounddist(distarr, nalt, nazi, il, ob); |
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> |
/* write out the sphere and its distribution */ |
213 |
> |
if (average(il, distarr, nalt*nazi)) { |
214 |
> |
if (il->sampdens > 0) |
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roundout(il, distarr, nalt, nazi); |
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else |
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objerror(ob, WARNING, "diffuse distribution"); |
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illumout(il, ob); |
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} else |
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printobj(il->altmat, ob); |
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/* clean up */ |
222 |
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free((char *)distarr); |
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> |
free((void *)distarr); |
223 |
> |
return(1); |
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} |
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o_ring(ob, il, rt, nm) /* make an illum ring */ |
228 |
< |
OBJREC *ob; |
229 |
< |
struct illum_args *il; |
230 |
< |
struct rtproc *rt; |
231 |
< |
char *nm; |
227 |
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int |
228 |
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o_ring( /* make an illum ring */ |
229 |
> |
OBJREC *ob, |
230 |
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struct illum_args *il, |
231 |
> |
struct rtproc *rt, |
232 |
> |
char *nm |
233 |
> |
) |
234 |
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{ |
235 |
< |
int dim[4]; |
235 |
> |
int dim[3]; |
236 |
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int n, nalt, nazi; |
237 |
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float *distarr; |
238 |
< |
double r1, r2; |
239 |
< |
FVECT dn, pos, dir; |
238 |
> |
double sp[4], r1, r2, r3; |
239 |
> |
FVECT dn, org, dir; |
240 |
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FVECT u, v; |
241 |
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register CONE *co; |
242 |
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register int i, j; |
243 |
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/* get/check arguments */ |
244 |
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co = getcone(ob, 0); |
245 |
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/* set up sampling */ |
246 |
< |
n = PI * il->sampdens; |
247 |
< |
nalt = sqrt(n/PI) + .5; |
248 |
< |
nazi = PI*nalt + .5; |
246 |
> |
if (il->sampdens <= 0) |
247 |
> |
nalt = nazi = 1; |
248 |
> |
else { |
249 |
> |
n = PI * il->sampdens; |
250 |
> |
nalt = sqrt(n/PI) + .5; |
251 |
> |
nazi = PI*nalt + .5; |
252 |
> |
} |
253 |
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n = nalt*nazi; |
254 |
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distarr = (float *)calloc(n, 3*sizeof(float)); |
255 |
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if (distarr == NULL) |
260 |
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for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
261 |
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for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
262 |
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for (i = 0; i < il->nsamps; i++) { |
263 |
+ |
/* next sample point */ |
264 |
+ |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
265 |
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/* random direction */ |
266 |
< |
dim[3] = 1; |
267 |
< |
r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt; |
243 |
< |
dim[3] = 2; |
244 |
< |
r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nalt; |
266 |
> |
r1 = (dim[1] + sp[0])/nalt; |
267 |
> |
r2 = (dim[2] + sp[1] - .5)/nazi; |
268 |
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flatdir(dn, r1, r2); |
269 |
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for (j = 0; j < 3; j++) |
270 |
< |
dir[j] = dn[0]*u[j] + dn[1]*v[j] - dn[2]*co->ad[j]; |
270 |
> |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
271 |
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/* random location */ |
272 |
< |
dim[3] = 3; |
273 |
< |
r1 = sqrt(CO_R0(co)*CO_R0(co) + |
274 |
< |
urand(urind(ilhash(dim,4),i))* |
275 |
< |
(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
276 |
< |
dim[3] = 4; |
254 |
< |
r2 = 2.*PI*urand(urind(ilhash(dim,4),i)); |
272 |
> |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
273 |
> |
sp[2]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
274 |
> |
r2 = 2.*PI*sp[3]; |
275 |
> |
r1 = r3*cos(r2); |
276 |
> |
r2 = r3*sin(r2); |
277 |
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for (j = 0; j < 3; j++) |
278 |
< |
org[j] = CO_P0(co)[j] + |
279 |
< |
r1*cos(r2)*u[j] + r1*sin(r2)*v[j] |
258 |
< |
+ .001*co->ad[j]; |
278 |
> |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
279 |
> |
.001*co->ad[j]; |
280 |
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|
281 |
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/* send sample */ |
282 |
< |
raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt); |
282 |
> |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
283 |
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} |
284 |
|
rayflush(rt); |
285 |
< |
/* write out the distribution */ |
286 |
< |
flatdist(distarr, nalt, nazi, il, ob); |
285 |
> |
/* write out the ring and its distribution */ |
286 |
> |
if (average(il, distarr, nalt*nazi)) { |
287 |
> |
if (il->sampdens > 0) |
288 |
> |
flatout(il, distarr, nalt, nazi, u, v, co->ad); |
289 |
> |
illumout(il, ob); |
290 |
> |
} else |
291 |
> |
printobj(il->altmat, ob); |
292 |
|
/* clean up */ |
293 |
|
freecone(ob); |
294 |
< |
free((char *)distarr); |
294 |
> |
free((void *)distarr); |
295 |
> |
return(1); |
296 |
|
} |
297 |
|
|
298 |
|
|
299 |
< |
raysamp(res, org, dir, rt) /* compute a ray sample */ |
300 |
< |
float res[3]; |
301 |
< |
FVECT org, dir; |
302 |
< |
register struct rtproc *rt; |
299 |
> |
void |
300 |
> |
raysamp( /* compute a ray sample */ |
301 |
> |
float res[3], |
302 |
> |
FVECT org, |
303 |
> |
FVECT dir, |
304 |
> |
register struct rtproc *rt |
305 |
> |
) |
306 |
|
{ |
307 |
|
register float *fp; |
308 |
|
|
315 |
|
} |
316 |
|
|
317 |
|
|
318 |
< |
rayflush(rt) /* flush buffered rays */ |
319 |
< |
register struct rtproc *rt; |
318 |
> |
void |
319 |
> |
rayflush( /* flush buffered rays */ |
320 |
> |
register struct rtproc *rt |
321 |
> |
) |
322 |
|
{ |
323 |
|
register int i; |
324 |
|
|
325 |
|
if (rt->nrays <= 0) |
326 |
|
return; |
327 |
< |
i = 6*rt->nrays + 3; |
328 |
< |
rt->buf[i++] = 0.; rt->buf[i++] = 0.; rt->buf[i] = 0.; |
329 |
< |
if ( process(rt->pd, (char *)rt->buf, (char *)rt->buf, |
330 |
< |
3*sizeof(float)*rt->nrays, |
327 |
> |
memset(rt->buf+6*rt->nrays, '\0', 6*sizeof(float)); |
328 |
> |
errno = 0; |
329 |
> |
if ( process(&(rt->pd), (char *)rt->buf, (char *)rt->buf, |
330 |
> |
3*sizeof(float)*(rt->nrays+1), |
331 |
|
6*sizeof(float)*(rt->nrays+1)) < |
332 |
< |
3*sizeof(float)*rt->nrays ) |
332 |
> |
3*sizeof(float)*(rt->nrays+1) ) |
333 |
|
error(SYSTEM, "error reading from rtrace process"); |
334 |
|
i = rt->nrays; |
335 |
|
while (i--) { |
338 |
|
rt->dest[i][2] += rt->buf[3*i+2]; |
339 |
|
} |
340 |
|
rt->nrays = 0; |
341 |
+ |
} |
342 |
+ |
|
343 |
+ |
|
344 |
+ |
void |
345 |
+ |
mkaxes( /* compute u and v to go with n */ |
346 |
+ |
FVECT u, |
347 |
+ |
FVECT v, |
348 |
+ |
FVECT n |
349 |
+ |
) |
350 |
+ |
{ |
351 |
+ |
register int i; |
352 |
+ |
|
353 |
+ |
v[0] = v[1] = v[2] = 0.0; |
354 |
+ |
for (i = 0; i < 3; i++) |
355 |
+ |
if (n[i] < 0.6 && n[i] > -0.6) |
356 |
+ |
break; |
357 |
+ |
v[i] = 1.0; |
358 |
+ |
fcross(u, v, n); |
359 |
+ |
normalize(u); |
360 |
+ |
fcross(v, n, u); |
361 |
+ |
} |
362 |
+ |
|
363 |
+ |
|
364 |
+ |
void |
365 |
+ |
rounddir( /* compute uniform spherical direction */ |
366 |
+ |
register FVECT dv, |
367 |
+ |
double alt, |
368 |
+ |
double azi |
369 |
+ |
) |
370 |
+ |
{ |
371 |
+ |
double d1, d2; |
372 |
+ |
|
373 |
+ |
dv[2] = 1. - 2.*alt; |
374 |
+ |
d1 = sqrt(1. - dv[2]*dv[2]); |
375 |
+ |
d2 = 2.*PI * azi; |
376 |
+ |
dv[0] = d1*cos(d2); |
377 |
+ |
dv[1] = d1*sin(d2); |
378 |
+ |
} |
379 |
+ |
|
380 |
+ |
|
381 |
+ |
void |
382 |
+ |
flatdir( /* compute uniform hemispherical direction */ |
383 |
+ |
register FVECT dv, |
384 |
+ |
double alt, |
385 |
+ |
double azi |
386 |
+ |
) |
387 |
+ |
{ |
388 |
+ |
double d1, d2; |
389 |
+ |
|
390 |
+ |
d1 = sqrt(alt); |
391 |
+ |
d2 = 2.*PI * azi; |
392 |
+ |
dv[0] = d1*cos(d2); |
393 |
+ |
dv[1] = d1*sin(d2); |
394 |
+ |
dv[2] = sqrt(1. - alt); |
395 |
|
} |