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/* Copyright (c) 1993 Regents of the University of California */ |
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/* Copyright (c) 1996 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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/* |
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* rpict.c - routines and variables for picture generation. |
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* |
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* 8/14/85 |
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*/ |
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#include "ray.h" |
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#include <sys/resource.h> |
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#else |
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#include <sys/times.h> |
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#include <sys/utsname.h> |
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#include <unistd.h> |
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#endif |
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#endif |
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double maxdiff = .05; /* max. difference for interpolation */ |
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double dstrpix = 0.67; /* square pixel distribution */ |
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|
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double mblur = 0.; /* motion blur parameter */ |
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|
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double dstrsrc = 0.0; /* square source distribution */ |
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double shadthresh = .05; /* shadow threshold */ |
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double shadcert = .5; /* shadow certainty */ |
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int directvis = 1; /* sources visible? */ |
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double srcsizerat = .25; /* maximum ratio source size/dist. */ |
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|
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COLOR cextinction = BLKCOLOR; /* global extinction coefficient */ |
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COLOR salbedo = BLKCOLOR; /* global scattering albedo */ |
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double seccg = 0.; /* global scattering eccentricity */ |
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double ssampdist = 0.; /* scatter sampling distance */ |
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|
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double specthresh = .15; /* specular sampling threshold */ |
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double specjitter = 1.; /* specular sampling jitter */ |
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|
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int backvis = 1; /* back face visibility */ |
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|
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int maxdepth = 6; /* maximum recursion depth */ |
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double minweight = 5e-3; /* minimum ray weight */ |
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|
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COLOR ambval = BLKCOLOR; /* ambient value */ |
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int ambvwt = 0; /* initial weight for ambient value */ |
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double ambacc = 0.2; /* ambient accuracy */ |
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int ambres = 32; /* ambient resolution */ |
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int ambdiv = 128; /* ambient divisions */ |
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|
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#define pixjitter() (.5+dstrpix*(.5-frandom())) |
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static int hres, vres; /* resolution for this frame */ |
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int hres, vres; /* resolution for this frame */ |
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static VIEW lastview; /* the previous view input */ |
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|
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extern char *mktemp(); |
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double pixvalue(); |
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#ifndef NIX |
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report() /* report progress */ |
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{ |
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extern char *myhostname(); |
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double u, s; |
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#ifdef BSD |
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char hostname[257]; |
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struct rusage rubuf; |
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#else |
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struct tms tbuf; |
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struct utsname nambuf; |
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double period; |
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#define hostname nambuf.nodename |
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#endif |
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|
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tlastrept = time((time_t *)NULL); |
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getrusage(RUSAGE_CHILDREN, &rubuf); |
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u += rubuf.ru_utime.tv_sec + rubuf.ru_utime.tv_usec/1e6; |
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s += rubuf.ru_stime.tv_sec + rubuf.ru_stime.tv_usec/1e6; |
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gethostname(hostname, sizeof(hostname)); |
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#else |
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times(&tbuf); |
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#ifdef _SC_CLK_TCK |
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#endif |
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u = ( tbuf.tms_utime + tbuf.tms_cutime ) * period; |
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s = ( tbuf.tms_stime + tbuf.tms_cstime ) * period; |
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uname(&nambuf); |
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#endif |
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sprintf(errmsg, |
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"%lu rays, %4.2f%% after %.3fu %.3fs %.3fr hours on %s\n", |
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nrays, pctdone, u/3600., s/3600., |
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(tlastrept-tstart)/3600., hostname); |
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(tlastrept-tstart)/3600., myhostname()); |
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eputs(errmsg); |
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#ifndef BSD |
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signal(SIGCONT, report); |
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#undef hostname |
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#endif |
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} |
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#else |
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{ |
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char linebuf[256]; |
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copystruct(&lastview, &ourview); |
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while (fgets(linebuf, sizeof(linebuf), fp) != NULL) |
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if (isview(linebuf) && sscanview(&ourview, linebuf) > 0) |
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return(0); |
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fprtresolu(hres, vres, stdout); |
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/* recover file and compute first */ |
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i = salvage(oldfile); |
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if (i >= vres) |
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goto alldone; |
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if (zfd != -1 && i > 0 && |
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lseek(zfd, (long)i*hres*sizeof(float), 0) == -1) |
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error(SYSTEM, "z-file seek error in render"); |
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else |
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#endif |
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signal(SIGCONT, report); |
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ypos = vres-1 - i; |
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ypos = vres-1 - i; /* initialize sampling */ |
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if (directvis) |
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init_drawsources(psample); |
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fillscanline(scanbar[0], zbar[0], sampdens, hres, ypos, hstep); |
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/* compute scanlines */ |
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for (ypos -= ystep; ypos > -ystep; ypos -= ystep) { |
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hres, ypos, hstep); |
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/* fill bar */ |
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fillscanbar(scanbar, zbar, hres, ypos, ystep); |
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if (directvis) /* add bitty sources */ |
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drawsources(scanbar, zbar, 0, hres, ypos, ystep); |
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/* write it out */ |
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#ifndef BSD |
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signal(SIGCONT, SIG_IGN); /* don't interrupt writes */ |
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} |
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/* clean up */ |
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signal(SIGCONT, SIG_IGN); |
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if (zfd != -1) { |
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if (write(zfd, (char *)zbar[0], hres*sizeof(float)) |
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if (zfd != -1 && write(zfd, (char *)zbar[0], hres*sizeof(float)) |
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< hres*sizeof(float)) |
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goto writerr; |
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goto writerr; |
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fwritescan(scanbar[0], hres, stdout); |
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if (fflush(stdout) == EOF) |
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goto writerr; |
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alldone: |
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if (zfd != -1) { |
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if (close(zfd) == -1) |
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goto writerr; |
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for (i = 0; i <= psample; i++) |
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free((char *)zbar[i]); |
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} |
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fwritescan(scanbar[0], hres, stdout); |
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if (fflush(stdout) == EOF) |
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goto writerr; |
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for (i = 0; i <= psample; i++) |
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free((char *)scanbar[i]); |
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if (sampdens != NULL) |
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int bl = xstep, b = xstep; |
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double z; |
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register int i; |
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z = pixvalue(scanline[0], 0, y); |
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if (zline) zline[0] = z; |
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/* zig-zag start for quincunx pattern */ |
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float zline[MAXDIV+1]; |
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int b = ysize; |
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register int i, j; |
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for (i = 0; i < xres; i++) { |
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copycolor(vline[0], scanbar[0][i]); |
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copycolor(vline[ysize], scanbar[ysize][i]); |
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if (zbar[0]) { |
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zline[0] = zbar[0][i]; |
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zline[ysize] = zbar[ysize][i]; |
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} |
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b = fillsample(vline, zbar[0] ? zline : (float *)NULL, |
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i, y, 0, ysize, b/2); |
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for (j = 1; j < ysize; j++) |
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copycolor(scanbar[j][i], vline[j]); |
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if (zbar[0]) |
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COLOR ctmp; |
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int ncut; |
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register int len; |
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if (xlen > 0) /* x or y length is zero */ |
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len = xlen; |
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else |
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len = ylen; |
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if (len <= 1) /* limit recursion */ |
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return(0); |
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if (b > 0 |
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|| (zline && 2.*fabs(zline[0]-zline[len]) > maxdiff*(zline[0]+zline[len])) |
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|
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if (b > 0 || |
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(zline && 2.*fabs(zline[0]-zline[len]) > maxdiff*(zline[0]+zline[len])) |
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|| bigdiff(colline[0], colline[len], maxdiff)) { |
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z = pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1)); |
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if (zline) zline[len>>1] = z; |
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ncut = 1; |
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} else { /* interpolate */ |
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copycolor(colline[len>>1], colline[len]); |
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ratio = (double)(len>>1) / len; |
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scalecolor(colline[len>>1], ratio); |
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} |
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/* recurse */ |
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ncut += fillsample(colline, zline, x, y, xlen>>1, ylen>>1, (b-1)/2); |
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|
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ncut += fillsample(colline+(len>>1), |
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zline ? zline+(len>>1) : (float *)NULL, |
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x+(xlen>>1), y+(ylen>>1), |
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COLOR col; /* returned color */ |
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int x, y; /* pixel position */ |
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{ |
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static RAY thisray; |
612 |
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|
613 |
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if (viewray(thisray.rorg, thisray.rdir, &ourview, |
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(x+pixjitter())/hres, (y+pixjitter())/vres) < 0) { |
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> |
RAY thisray; |
612 |
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FVECT lorg, ldir; |
613 |
> |
double hpos, vpos, lmax, d; |
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> |
/* compute view ray */ |
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> |
hpos = (x+pixjitter())/hres; |
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> |
vpos = (y+pixjitter())/vres; |
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> |
if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir, |
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&ourview, hpos, vpos)) < -FTINY) { |
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setcolor(col, 0.0, 0.0, 0.0); |
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return(0.0); |
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} |
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rayorigin(&thisray, NULL, PRIMARY, 1.0); |
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|
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samplendx = pixnumber(x,y,hres,vres); /* set pixel index */ |
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|
625 |
+ |
/* optional motion blur */ |
626 |
+ |
if (lastview.type && mblur > FTINY && (lmax = viewray(lorg, ldir, |
627 |
+ |
&lastview, hpos, vpos)) >= -FTINY) { |
628 |
+ |
register int i; |
629 |
+ |
register double d = mblur*(.5-urand(281+samplendx)); |
630 |
+ |
|
631 |
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thisray.rmax = (1.-d)*thisray.rmax + d*lmax; |
632 |
+ |
for (i = 3; i--; ) { |
633 |
+ |
thisray.rorg[i] = (1.-d)*thisray.rorg[i] + d*lorg[i]; |
634 |
+ |
thisray.rdir[i] = (1.-d)*thisray.rdir[i] + d*ldir[i]; |
635 |
+ |
} |
636 |
+ |
if (normalize(thisray.rdir) == 0.0) |
637 |
+ |
return(0.0); |
638 |
+ |
} |
639 |
+ |
|
640 |
+ |
rayorigin(&thisray, NULL, PRIMARY, 1.0); |
641 |
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|
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rayvalue(&thisray); /* trace ray */ |
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copycolor(col, thisray.rcol); /* return color */ |
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> |
|
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return(thisray.rt); /* return distance */ |
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} |
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