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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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* 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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#include "selcall.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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static void mkaxes(FVECT u, FVECT v, FVECT n); |
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> |
static void rounddir(FVECT dv, double alt, double azi); |
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static void flatdir(FVECT dv, double alt, double azi); |
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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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static void |
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rayclean( /* finish all pending rays */ |
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struct rtproc *rt0 |
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) |
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{ |
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rayflush(rt0, 1); |
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while (raywait(rt0) != NULL) |
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; |
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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 *rt0, |
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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 *rt0, |
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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[3]; |
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int n, nalt, nazi, h; |
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float *distarr; |
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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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register FACE *fa; |
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register int i, j; |
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/* get/check arguments */ |
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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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return(o_default(ob, il, rt0, nm)); |
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} |
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/* set up sampling */ |
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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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/* 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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r1 = DOT(VERTEX(fa,i),u); |
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if (r1 < ur[0]) ur[0] = r1; |
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if (r1 > ur[1]) ur[1] = r1; |
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r2 = DOT(VERTEX(fa,i),v); |
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if (r2 < vr[0]) vr[0] = r2; |
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if (r2 > vr[1]) vr[1] = r2; |
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} |
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dim[0] = random(); |
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/* sample polygon */ |
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nmisses = 0; |
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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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/* random direction */ |
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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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/* random location */ |
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do { |
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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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} while (!inface(org, fa) && nmisses++ < MAXMISS); |
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if (nmisses > MAXMISS) { |
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objerror(ob, WARNING, "bad aspect"); |
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rayclean(rt0); |
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freeface(ob); |
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free((void *)distarr); |
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return(o_default(ob, il, rt0, 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+3*(dim[1]*nazi+dim[2]), org, dir, rt0); |
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} |
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rayclean(rt0); |
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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((void *)distarr); |
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return(0); |
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#undef MAXMISS |
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} |
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|
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o_sphere(ob, il, rt, nm) /* make an illum sphere */ |
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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_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 *rt0, |
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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 */ |
| 181 |
< |
n = 4.*PI * il->sampdens; |
| 182 |
< |
nalt = sqrt(n/PI) + .5; |
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< |
nazi = PI*nalt + .5; |
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> |
if (il->sampdens <= 0) |
| 182 |
> |
nalt = nazi = 1; |
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> |
else { |
| 184 |
> |
n = 4.*PI * il->sampdens; |
| 185 |
> |
nalt = sqrt(2./PI*n) + .5; |
| 186 |
> |
nazi = PI/2.*nalt + .5; |
| 187 |
> |
} |
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n = nalt*nazi; |
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distarr = (float *)calloc(n, 3*sizeof(float)); |
| 190 |
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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]++) |
| 196 |
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for (i = 0; i < il->nsamps; i++) { |
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+ |
/* next sample point */ |
| 198 |
+ |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
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/* random direction */ |
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< |
dim[3] = 1; |
| 201 |
< |
r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt; |
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< |
dim[3] = 2; |
| 103 |
< |
r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nalt; |
| 200 |
> |
r1 = (dim[1] + sp[0])/nalt; |
| 201 |
> |
r2 = (dim[2] + sp[1] - .5)/nazi; |
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rounddir(dir, r1, r2); |
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/* random location */ |
| 204 |
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mkaxes(u, v, dir); /* yuck! */ |
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< |
dim[3] = 3; |
| 206 |
< |
r1 = sqrt(urand(urind(ilhash(dim,4),i))); |
| 207 |
< |
dim[3] = 4; |
| 208 |
< |
r2 = 2.*PI*urand(urind(ilhash(dim,4),i)); |
| 209 |
< |
for (j = 0; j < 3; j++) |
| 210 |
< |
org[j] = obj->oargs.farg[j] + obj->oargs.farg[3] * |
| 211 |
< |
( r1*cos(r2)*u[j] + r1*sin(r2)*v[j] |
| 212 |
< |
- sqrt(1.01-r1*r1)*dir[j] ); |
| 213 |
< |
|
| 205 |
> |
r3 = sqrt(sp[2]); |
| 206 |
> |
r2 = 2.*PI*sp[3]; |
| 207 |
> |
r1 = r3*ob->oargs.farg[3]*cos(r2); |
| 208 |
> |
r2 = r3*ob->oargs.farg[3]*sin(r2); |
| 209 |
> |
r3 = ob->oargs.farg[3]*sqrt(1.01-r3*r3); |
| 210 |
> |
for (j = 0; j < 3; j++) { |
| 211 |
> |
org[j] = ob->oargs.farg[j] + r1*u[j] + r2*v[j] + |
| 212 |
> |
r3*dir[j]; |
| 213 |
> |
dir[j] = -dir[j]; |
| 214 |
> |
} |
| 215 |
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/* send sample */ |
| 216 |
< |
raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt); |
| 216 |
> |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt0); |
| 217 |
|
} |
| 218 |
< |
rayflush(rt); |
| 219 |
< |
/* write out distribution */ |
| 220 |
< |
rounddist(distarr, nalt, nazi, il, ob); |
| 218 |
> |
rayclean(rt0); |
| 219 |
> |
/* write out the sphere and its distribution */ |
| 220 |
> |
if (average(il, distarr, nalt*nazi)) { |
| 221 |
> |
if (il->sampdens > 0) |
| 222 |
> |
roundout(il, distarr, nalt, nazi); |
| 223 |
> |
else |
| 224 |
> |
objerror(ob, WARNING, "diffuse distribution"); |
| 225 |
> |
illumout(il, ob); |
| 226 |
> |
} else |
| 227 |
> |
printobj(il->altmat, ob); |
| 228 |
|
/* clean up */ |
| 229 |
< |
free((char *)distarr); |
| 229 |
> |
free((void *)distarr); |
| 230 |
> |
return(1); |
| 231 |
|
} |
| 232 |
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|
| 233 |
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|
| 234 |
< |
o_ring(ob, il, rt, nm) /* make an illum ring */ |
| 235 |
< |
OBJREC *ob; |
| 236 |
< |
struct illum_args *il; |
| 237 |
< |
struct rtproc *rt; |
| 238 |
< |
char *nm; |
| 234 |
> |
int |
| 235 |
> |
o_ring( /* make an illum ring */ |
| 236 |
> |
OBJREC *ob, |
| 237 |
> |
struct illum_args *il, |
| 238 |
> |
struct rtproc *rt0, |
| 239 |
> |
char *nm |
| 240 |
> |
) |
| 241 |
|
{ |
| 242 |
+ |
int dim[3]; |
| 243 |
+ |
int n, nalt, nazi; |
| 244 |
+ |
float *distarr; |
| 245 |
+ |
double sp[4], r1, r2, r3; |
| 246 |
+ |
FVECT dn, org, dir; |
| 247 |
+ |
FVECT u, v; |
| 248 |
+ |
register CONE *co; |
| 249 |
+ |
register int i, j; |
| 250 |
+ |
/* get/check arguments */ |
| 251 |
+ |
co = getcone(ob, 0); |
| 252 |
+ |
/* set up sampling */ |
| 253 |
+ |
if (il->sampdens <= 0) |
| 254 |
+ |
nalt = nazi = 1; |
| 255 |
+ |
else { |
| 256 |
+ |
n = PI * il->sampdens; |
| 257 |
+ |
nalt = sqrt(n/PI) + .5; |
| 258 |
+ |
nazi = PI*nalt + .5; |
| 259 |
+ |
} |
| 260 |
+ |
n = nalt*nazi; |
| 261 |
+ |
distarr = (float *)calloc(n, 3*sizeof(float)); |
| 262 |
+ |
if (distarr == NULL) |
| 263 |
+ |
error(SYSTEM, "out of memory in o_ring"); |
| 264 |
+ |
mkaxes(u, v, co->ad); |
| 265 |
+ |
dim[0] = random(); |
| 266 |
+ |
/* sample disk */ |
| 267 |
+ |
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
| 268 |
+ |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
| 269 |
+ |
for (i = 0; i < il->nsamps; i++) { |
| 270 |
+ |
/* next sample point */ |
| 271 |
+ |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
| 272 |
+ |
/* random direction */ |
| 273 |
+ |
r1 = (dim[1] + sp[0])/nalt; |
| 274 |
+ |
r2 = (dim[2] + sp[1] - .5)/nazi; |
| 275 |
+ |
flatdir(dn, r1, r2); |
| 276 |
+ |
for (j = 0; j < 3; j++) |
| 277 |
+ |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
| 278 |
+ |
/* random location */ |
| 279 |
+ |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
| 280 |
+ |
sp[2]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
| 281 |
+ |
r2 = 2.*PI*sp[3]; |
| 282 |
+ |
r1 = r3*cos(r2); |
| 283 |
+ |
r2 = r3*sin(r2); |
| 284 |
+ |
for (j = 0; j < 3; j++) |
| 285 |
+ |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
| 286 |
+ |
.001*co->ad[j]; |
| 287 |
+ |
|
| 288 |
+ |
/* send sample */ |
| 289 |
+ |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt0); |
| 290 |
+ |
} |
| 291 |
+ |
rayclean(rt0); |
| 292 |
+ |
/* write out the ring and its distribution */ |
| 293 |
+ |
if (average(il, distarr, nalt*nazi)) { |
| 294 |
+ |
if (il->sampdens > 0) |
| 295 |
+ |
flatout(il, distarr, nalt, nazi, u, v, co->ad); |
| 296 |
+ |
illumout(il, ob); |
| 297 |
+ |
} else |
| 298 |
+ |
printobj(il->altmat, ob); |
| 299 |
+ |
/* clean up */ |
| 300 |
+ |
freecone(ob); |
| 301 |
+ |
free((void *)distarr); |
| 302 |
+ |
return(1); |
| 303 |
|
} |
| 304 |
|
|
| 305 |
|
|
| 306 |
< |
raysamp(res, org, dir, rt) /* compute a ray sample */ |
| 307 |
< |
float res[3]; |
| 308 |
< |
FVECT org, dir; |
| 309 |
< |
register struct rtproc *rt; |
| 306 |
> |
void |
| 307 |
> |
raysamp( /* queue a ray sample */ |
| 308 |
> |
float res[3], |
| 309 |
> |
FVECT org, |
| 310 |
> |
FVECT dir, |
| 311 |
> |
struct rtproc *rt0 |
| 312 |
> |
) |
| 313 |
|
{ |
| 314 |
+ |
register struct rtproc *rt; |
| 315 |
|
register float *fp; |
| 316 |
|
|
| 317 |
< |
if (rt->nrays == rt->bsiz) |
| 318 |
< |
rayflush(rt); |
| 319 |
< |
rt->dest[rt->nrays] = res; |
| 320 |
< |
fp = rt->buf + 6*rt->nrays++; |
| 317 |
> |
for (rt = rt0; rt != NULL; rt = rt->next) |
| 318 |
> |
if (rt->nrays < rt->bsiz && rt->dest[rt->nrays] == NULL) |
| 319 |
> |
break; |
| 320 |
> |
if (rt == NULL) /* need to free up buffer? */ |
| 321 |
> |
rt = raywait(rt0); |
| 322 |
> |
if (rt == NULL) |
| 323 |
> |
error(SYSTEM, "raywait() returned NULL"); |
| 324 |
> |
fp = rt->buf + 6*rt->nrays; |
| 325 |
|
*fp++ = org[0]; *fp++ = org[1]; *fp++ = org[2]; |
| 326 |
|
*fp++ = dir[0]; *fp++ = dir[1]; *fp = dir[2]; |
| 327 |
+ |
rt->dest[rt->nrays++] = res; |
| 328 |
+ |
if (rt->nrays == rt->bsiz) |
| 329 |
+ |
rayflush(rt, 0); |
| 330 |
|
} |
| 331 |
|
|
| 332 |
|
|
| 333 |
< |
rayflush(rt) /* flush buffered rays */ |
| 334 |
< |
register struct rtproc *rt; |
| 333 |
> |
void |
| 334 |
> |
rayflush( /* flush queued rays to rtrace */ |
| 335 |
> |
register struct rtproc *rt, |
| 336 |
> |
int doall |
| 337 |
> |
) |
| 338 |
|
{ |
| 339 |
< |
register int i; |
| 339 |
> |
int nw; |
| 340 |
|
|
| 341 |
< |
if (rt->nrays <= 0) |
| 342 |
< |
return; |
| 343 |
< |
i = 6*rt->nrays + 3; |
| 344 |
< |
rt->buf[i++] = 0.; rt->buf[i++] = 0.; rt->buf[i] = 0.; |
| 345 |
< |
if ( process(rt->pd, (char *)rt->buf, (char *)rt->buf, |
| 346 |
< |
3*sizeof(float)*rt->nrays, |
| 347 |
< |
6*sizeof(float)*(rt->nrays+1)) < |
| 348 |
< |
3*sizeof(float)*rt->nrays ) |
| 349 |
< |
error(SYSTEM, "error reading from rtrace process"); |
| 350 |
< |
i = rt->nrays; |
| 351 |
< |
while (i--) { |
| 352 |
< |
rt->dest[i][0] += rt->buf[3*i]; |
| 353 |
< |
rt->dest[i][1] += rt->buf[3*i+1]; |
| 354 |
< |
rt->dest[i][2] += rt->buf[3*i+2]; |
| 341 |
> |
do { |
| 342 |
> |
if (rt->nrays <= 0) |
| 343 |
> |
continue; |
| 344 |
> |
memset(rt->buf+6*rt->nrays, 0, 6*sizeof(float)); |
| 345 |
> |
nw = 6*sizeof(float)*(rt->nrays+1); |
| 346 |
> |
errno = 0; |
| 347 |
> |
if (writebuf(rt->pd.w, (char *)rt->buf, nw) < nw) |
| 348 |
> |
error(SYSTEM, "error writing to rtrace process"); |
| 349 |
> |
rt->nrays = 0; /* flag buffer as flushed */ |
| 350 |
> |
} while (doall && (rt = rt->next) != NULL); |
| 351 |
> |
} |
| 352 |
> |
|
| 353 |
> |
|
| 354 |
> |
struct rtproc * |
| 355 |
> |
raywait( /* retrieve rtrace results */ |
| 356 |
> |
struct rtproc *rt0 |
| 357 |
> |
) |
| 358 |
> |
{ |
| 359 |
> |
fd_set readset, errset; |
| 360 |
> |
int nr; |
| 361 |
> |
struct rtproc *rt, *rtfree; |
| 362 |
> |
register int n; |
| 363 |
> |
/* prepare select call */ |
| 364 |
> |
FD_ZERO(&readset); FD_ZERO(&errset); n = 0; |
| 365 |
> |
nr = 0; |
| 366 |
> |
for (rt = rt0; rt != NULL; rt = rt->next) { |
| 367 |
> |
if (rt->nrays == 0 && rt->dest[0] != NULL) { |
| 368 |
> |
FD_SET(rt->pd.r, &readset); |
| 369 |
> |
++nr; |
| 370 |
> |
} |
| 371 |
> |
FD_SET(rt->pd.r, &errset); |
| 372 |
> |
if (rt->pd.r >= n) |
| 373 |
> |
n = rt->pd.r + 1; |
| 374 |
|
} |
| 375 |
< |
rt->nrays = 0; |
| 375 |
> |
if (!nr) /* no rays pending */ |
| 376 |
> |
return(NULL); |
| 377 |
> |
if (nr > 1) /* call select for multiple processes */ |
| 378 |
> |
n = select(n, &readset, (fd_set *)NULL, &errset, |
| 379 |
> |
(struct timeval *)NULL); |
| 380 |
> |
else |
| 381 |
> |
FD_ZERO(&errset); |
| 382 |
> |
if (n <= 0) |
| 383 |
> |
return(NULL); |
| 384 |
> |
rtfree = NULL; /* read from ready process(es) */ |
| 385 |
> |
for (rt = rt0; rt != NULL; rt = rt->next) { |
| 386 |
> |
if (!FD_ISSET(rt->pd.r, &readset) && |
| 387 |
> |
!FD_ISSET(rt->pd.r, &errset)) |
| 388 |
> |
continue; |
| 389 |
> |
for (n = 0; n < rt->bsiz && rt->dest[n] != NULL; n++) |
| 390 |
> |
; |
| 391 |
> |
errno = 0; |
| 392 |
> |
nr = read(rt->pd.r, (char *)rt->buf, 3*sizeof(float)*(n+1)); |
| 393 |
> |
if (nr < 0) |
| 394 |
> |
error(SYSTEM, "read error in raywait()"); |
| 395 |
> |
if (nr == 0) /* unexpected EOF */ |
| 396 |
> |
error(USER, "rtrace process died"); |
| 397 |
> |
if (nr < 3*sizeof(float)*(n+1)) { /* read the rest */ |
| 398 |
> |
nr = readbuf(rt->pd.r, (char *)rt->buf, |
| 399 |
> |
3*sizeof(float)*(n+1) - nr); |
| 400 |
> |
if (nr < 0) |
| 401 |
> |
error(USER, "readbuf error in raywait()"); |
| 402 |
> |
} |
| 403 |
> |
while (n-- > 0) { |
| 404 |
> |
rt->dest[n][0] += rt->buf[3*n]; |
| 405 |
> |
rt->dest[n][1] += rt->buf[3*n+1]; |
| 406 |
> |
rt->dest[n][2] += rt->buf[3*n+2]; |
| 407 |
> |
rt->dest[n] = NULL; |
| 408 |
> |
} |
| 409 |
> |
rtfree = rt; |
| 410 |
> |
} |
| 411 |
> |
return(rtfree); |
| 412 |
> |
} |
| 413 |
> |
|
| 414 |
> |
|
| 415 |
> |
static void |
| 416 |
> |
mkaxes( /* compute u and v to go with n */ |
| 417 |
> |
FVECT u, |
| 418 |
> |
FVECT v, |
| 419 |
> |
FVECT n |
| 420 |
> |
) |
| 421 |
> |
{ |
| 422 |
> |
register int i; |
| 423 |
> |
|
| 424 |
> |
v[0] = v[1] = v[2] = 0.0; |
| 425 |
> |
for (i = 0; i < 3; i++) |
| 426 |
> |
if (n[i] < 0.6 && n[i] > -0.6) |
| 427 |
> |
break; |
| 428 |
> |
v[i] = 1.0; |
| 429 |
> |
fcross(u, v, n); |
| 430 |
> |
normalize(u); |
| 431 |
> |
fcross(v, n, u); |
| 432 |
> |
} |
| 433 |
> |
|
| 434 |
> |
|
| 435 |
> |
static void |
| 436 |
> |
rounddir( /* compute uniform spherical direction */ |
| 437 |
> |
register FVECT dv, |
| 438 |
> |
double alt, |
| 439 |
> |
double azi |
| 440 |
> |
) |
| 441 |
> |
{ |
| 442 |
> |
double d1, d2; |
| 443 |
> |
|
| 444 |
> |
dv[2] = 1. - 2.*alt; |
| 445 |
> |
d1 = sqrt(1. - dv[2]*dv[2]); |
| 446 |
> |
d2 = 2.*PI * azi; |
| 447 |
> |
dv[0] = d1*cos(d2); |
| 448 |
> |
dv[1] = d1*sin(d2); |
| 449 |
> |
} |
| 450 |
> |
|
| 451 |
> |
|
| 452 |
> |
static void |
| 453 |
> |
flatdir( /* compute uniform hemispherical direction */ |
| 454 |
> |
register FVECT dv, |
| 455 |
> |
double alt, |
| 456 |
> |
double azi |
| 457 |
> |
) |
| 458 |
> |
{ |
| 459 |
> |
double d1, d2; |
| 460 |
> |
|
| 461 |
> |
d1 = sqrt(alt); |
| 462 |
> |
d2 = 2.*PI * azi; |
| 463 |
> |
dv[0] = d1*cos(d2); |
| 464 |
> |
dv[1] = d1*sin(d2); |
| 465 |
> |
dv[2] = sqrt(1. - alt); |
| 466 |
|
} |
