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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 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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|
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#include "random.h" |
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#include "selcall.h" |
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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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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 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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|
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|
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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->altmat, ob); |
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printobj(il->altmat, ob); |
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return(1); |
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} |
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|
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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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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, 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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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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} 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(rt0); |
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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, 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, rt); |
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raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt0); |
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} |
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rayflush(rt); |
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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 if (!(il->flags & IL_LIGHT)) |
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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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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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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[3]; |
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int n, nalt, nazi; |
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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(n/PI) + .5; |
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nazi = PI*nalt + .5; |
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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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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(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt0); |
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} |
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rayflush(rt); |
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rayclean(rt0); |
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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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objerror(ob, WARNING, "diffuse distribution"); |
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illumout(il, ob); |
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} else if (!(il->flags & IL_LIGHT)) |
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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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free((void *)distarr); |
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return(1); |
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} |
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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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o_ring( /* make an illum ring */ |
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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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int dim[3]; |
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int n, nalt, nazi; |
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r1 = r3*cos(r2); |
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r2 = r3*sin(r2); |
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for (j = 0; j < 3; j++) |
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org[j] = CO_P0(co)[j] + r1*u[j] + r1*v[j] + |
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org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
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.001*co->ad[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(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt0); |
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} |
291 |
< |
rayflush(rt); |
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rayclean(rt0); |
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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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flatout(il, distarr, nalt, nazi, u, v, co->ad); |
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illumout(il, ob); |
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} else if (!(il->flags & IL_LIGHT)) |
297 |
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} else |
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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); |
301 |
> |
free((void *)distarr); |
302 |
> |
return(1); |
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} |
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|
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|
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< |
raysamp(res, org, dir, rt) /* compute a ray sample */ |
307 |
< |
float res[3]; |
308 |
< |
FVECT org, dir; |
309 |
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register struct rtproc *rt; |
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> |
void |
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raysamp( /* queue a ray sample */ |
308 |
> |
float res[3], |
309 |
> |
FVECT org, |
310 |
> |
FVECT dir, |
311 |
> |
struct rtproc *rt0 |
312 |
> |
) |
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{ |
314 |
+ |
register struct rtproc *rt; |
315 |
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register float *fp; |
316 |
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|
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 |
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*fp++ = org[0]; *fp++ = org[1]; *fp++ = org[2]; |
326 |
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*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 |
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} |
331 |
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|
332 |
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|
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 |
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{ |
339 |
< |
register int i; |
339 |
> |
int nw; |
340 |
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|
341 |
< |
if (rt->nrays <= 0) |
342 |
< |
return; |
343 |
< |
bzero(rt->buf+6*rt->nrays, 6*sizeof(float)); |
344 |
< |
errno = 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 |
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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 |
< |
mkaxes(u, v, n) /* compute u and v to go with n */ |
416 |
< |
FVECT u, v, n; |
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 |
|
|
432 |
|
} |
433 |
|
|
434 |
|
|
435 |
< |
rounddir(dv, alt, azi) /* compute uniform spherical direction */ |
436 |
< |
register FVECT dv; |
437 |
< |
double alt, azi; |
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 |
|
|
449 |
|
} |
450 |
|
|
451 |
|
|
452 |
< |
flatdir(dv, alt, azi) /* compute uniform hemispherical direction */ |
453 |
< |
register FVECT dv; |
454 |
< |
double alt, azi; |
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 |
|
|