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/* Copyright (c) 1995 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 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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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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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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|
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|
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static COLORV * distarr = NULL; /* distribution array */ |
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static int distsiz = 0; |
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|
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|
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static void |
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newdist( /* allocate & clear distribution array */ |
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int siz |
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) |
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{ |
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if (siz == 0) { |
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if (distsiz > 0) |
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free((void *)distarr); |
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distarr = NULL; |
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distsiz = 0; |
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return; |
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} |
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if (distsiz < siz) { |
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free((void *)distarr); |
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distarr = (COLORV *)malloc(sizeof(COLORV)*3*siz); |
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if (distarr == NULL) |
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error(SYSTEM, "Out of memory in distalloc"); |
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distsiz = siz; |
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} |
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memset(distarr, '\0', sizeof(COLORV)*3*siz); |
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} |
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|
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|
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static int |
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process_ray(RAY *r, int rv) |
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{ |
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COLORV *colp; |
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|
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if (rv == 0) |
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return(0); |
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if (rv < 0) |
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error(USER, "Ray tracing process died"); |
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if (r->rno >= distsiz) |
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error(INTERNAL, "Bad returned index in process_ray"); |
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colp = &distarr[r->rno * 3]; |
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addcolor(colp, r->rcol); |
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return(1); |
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} |
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|
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|
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static void |
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raysamp( /* queue a ray sample */ |
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int ndx, |
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FVECT org, |
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FVECT dir |
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) |
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{ |
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RAY myRay; |
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int rv; |
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|
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if ((ndx < 0) | (ndx >= distsiz)) |
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error(INTERNAL, "Bad index in raysamp"); |
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VCOPY(myRay.rorg, org); |
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VCOPY(myRay.rdir, dir); |
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myRay.rmax = .0; |
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rayorigin(&myRay, PRIMARY, NULL, NULL); |
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myRay.rno = ndx; |
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/* queue ray, check result */ |
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process_ray(&myRay, ray_pqueue(&myRay)); |
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} |
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|
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|
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static void |
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rayclean() /* finish all pending rays */ |
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{ |
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RAY myRay; |
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|
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while (process_ray(&myRay, ray_presult(&myRay, 0))) |
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; |
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} |
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|
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|
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int /* XXX type conflict with otypes.h */ |
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my_default( /* default illum action */ |
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OBJREC *ob, |
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struct illum_args *il, |
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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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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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my_face( /* make an illum face */ |
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OBJREC *ob, |
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struct illum_args *il, |
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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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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, nm)); |
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} |
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/* set up sampling */ |
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if (il->sampdens <= 0) |
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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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newdist(n); |
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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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} 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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rt->nrays = 0; |
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rayclean(); |
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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, 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, rt); |
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raysamp(dim[1]*nazi+dim[2], org, dir); |
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} |
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rayflush(rt); |
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rayclean(); |
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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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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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return(0); |
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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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my_sphere( /* make an illum sphere */ |
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register OBJREC *ob, |
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struct illum_args *il, |
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char *nm |
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) |
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{ |
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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 sp[4], r1, r2, r3; |
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FVECT org, dir; |
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FVECT u, v; |
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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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error(SYSTEM, "out of memory in o_sphere"); |
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newdist(n); |
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dim[0] = random(); |
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/* sample sphere */ |
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for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
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dir[j] = -dir[j]; |
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} |
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/* send sample */ |
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raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
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raysamp(dim[1]*nazi+dim[2], org, dir); |
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} |
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rayflush(rt); |
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rayclean(); |
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/* write out the sphere 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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} else |
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printobj(il->altmat, ob); |
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/* clean up */ |
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free((char *)distarr); |
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return(1); |
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} |
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o_ring(ob, il, rt, nm) /* make an illum ring */ |
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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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my_ring( /* make an illum ring */ |
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OBJREC *ob, |
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struct illum_args *il, |
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char *nm |
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) |
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{ |
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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 sp[4], r1, r2, r3; |
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FVECT dn, org, dir; |
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FVECT u, v; |
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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_ring"); |
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newdist(n); |
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mkaxes(u, v, co->ad); |
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dim[0] = random(); |
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/* sample disk */ |
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.001*co->ad[j]; |
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/* send sample */ |
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raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
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raysamp(dim[1]*nazi+dim[2], org, dir); |
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} |
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rayflush(rt); |
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rayclean(); |
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/* write out the ring 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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printobj(il->altmat, ob); |
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/* clean up */ |
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freecone(ob); |
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free((char *)distarr); |
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return(1); |
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} |
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raysamp(res, org, dir, rt) /* compute a ray sample */ |
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float res[3]; |
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FVECT org, dir; |
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register struct rtproc *rt; |
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static void |
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mkaxes( /* compute u and v to go with n */ |
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FVECT u, |
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FVECT v, |
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FVECT n |
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) |
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{ |
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register float *fp; |
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|
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if (rt->nrays == rt->bsiz) |
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rayflush(rt); |
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rt->dest[rt->nrays] = res; |
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fp = rt->buf + 6*rt->nrays++; |
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*fp++ = org[0]; *fp++ = org[1]; *fp++ = org[2]; |
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*fp++ = dir[0]; *fp++ = dir[1]; *fp = dir[2]; |
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} |
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rayflush(rt) /* flush buffered rays */ |
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register struct rtproc *rt; |
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{ |
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register int i; |
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if (rt->nrays <= 0) |
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return; |
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bzero(rt->buf+6*rt->nrays, 6*sizeof(float)); |
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errno = 0; |
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if ( process(rt->pd, (char *)rt->buf, (char *)rt->buf, |
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3*sizeof(float)*(rt->nrays+1), |
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6*sizeof(float)*(rt->nrays+1)) < |
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3*sizeof(float)*(rt->nrays+1) ) |
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error(SYSTEM, "error reading from rtrace process"); |
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i = rt->nrays; |
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while (i--) { |
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rt->dest[i][0] += rt->buf[3*i]; |
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rt->dest[i][1] += rt->buf[3*i+1]; |
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rt->dest[i][2] += rt->buf[3*i+2]; |
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} |
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rt->nrays = 0; |
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} |
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|
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|
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mkaxes(u, v, n) /* compute u and v to go with n */ |
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FVECT u, v, n; |
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{ |
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register int i; |
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|
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v[0] = v[1] = v[2] = 0.0; |
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for (i = 0; i < 3; i++) |
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if (n[i] < 0.6 && n[i] > -0.6) |
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} |
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rounddir(dv, alt, azi) /* compute uniform spherical direction */ |
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register FVECT dv; |
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double alt, azi; |
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static void |
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rounddir( /* compute uniform spherical direction */ |
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register FVECT dv, |
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double alt, |
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double azi |
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) |
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{ |
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double d1, d2; |
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} |
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flatdir(dv, alt, azi) /* compute uniform hemispherical direction */ |
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register FVECT dv; |
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double alt, azi; |
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static void |
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flatdir( /* compute uniform hemispherical direction */ |
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register FVECT dv, |
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double alt, |
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double azi |
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) |
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{ |
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double d1, d2; |
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