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/* |
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================================================================== |
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Dump photon maps as RADIANCE scene description to stdout |
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|
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Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) |
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(c) Fraunhofer Institute for Solar Energy Systems, |
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(c) Lucerne University of Applied Sciences and Arts, |
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supported by the Swiss National Science Foundation (SNSF, #147053) |
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================================================================== |
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|
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$Id: pmapdump.c,v 2.2 2015/04/21 19:16:51 greg Exp $ |
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*/ |
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|
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|
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|
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#include "pmapio.h" |
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#include "pmapparm.h" |
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#include "pmaptype.h" |
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#include "rtio.h" |
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#include "resolu.h" |
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#include "random.h" |
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#include "math.h" |
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|
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|
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/* Defaults */ |
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/* Sphere radius as fraction of avg. intersphere dist */ |
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/* Relative scale for sphere radius (fudge factor) */ |
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/* Number of spheres */ |
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#define RADCOEFF 0.05 |
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#define RADSCALE 1.0 |
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#define NSPHERES 10000 |
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|
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|
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/* RADIANCE material and object defs for each photon type */ |
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typedef struct { |
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char *mat, *obj; |
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} RadianceDef; |
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|
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|
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static char header [] = "$Revision: 2.2 $"; |
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|
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|
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/* Colour code is as follows: global = blue |
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precomp global = cyan |
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caustic = red |
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volume = green |
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direct = magenta |
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contrib = yellow */ |
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const RadianceDef radDefs [] = { |
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{ "void plastic mat.global\n0\n0\n5 0 0 1 0 0\n", |
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"mat.global sphere obj.global\n0\n0\n4 %g %g %g %g\n" |
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}, |
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{ "void plastic mat.pglobal\n0\n0\n5 0 1 1 0 0\n", |
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"mat.pglobal sphere obj.global\n0\n0\n4 %g %g %g %g\n" |
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}, |
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{ "void plastic mat.caustic\n0\n0\n5 1 0 0 0 0\n", |
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"mat.caustic sphere obj.caustic\n0\n0\n4 %g %g %g %g\n" |
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}, |
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{ "void plastic mat.volume\n0\n0\n5 0 1 0 0 0\n", |
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"mat.volume sphere obj.volume\n0\n0\n4 %g %g %g %g\n" |
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}, |
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{ "void plastic mat.direct\n0\n0\n5 1 0 1 0 0\n", |
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"mat.direct sphere obj.direct\n0\n0\n4 %g %g %g %g\n" |
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}, |
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{ "void plastic mat.contrib\n0\n0\n5 1 1 0 0 0\n", |
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"mat.contrib sphere obj.contrib\n0\n0\n4 %g %g %g %g\n" |
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} |
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}; |
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|
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|
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|
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int main (int argc, char** argv) |
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{ |
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char format [128]; |
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RREAL rad, radScale = RADSCALE, vol, dumpRatio; |
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FVECT minPos, maxPos; |
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unsigned arg, j, ptype; |
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long numPhotons, numSpheres = NSPHERES; |
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FILE *pmapFile; |
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Photon p; |
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|
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if (argc < 2) { |
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puts("Dump photon maps as RADIANCE scene description\n"); |
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printf("Usage: %s [-r radscale1] [-n nspheres1] pmap1 " |
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"[-r radscale2] [-n nspheres2] pmap2 ...\n", argv [0]); |
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return 1; |
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} |
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|
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for (arg = 1; arg < argc; arg++) { |
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/* Parse options */ |
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if (argv [arg][0] == '-') { |
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switch (argv [arg][1]) { |
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case 'r': |
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if ((radScale = atof(argv [++arg])) <= 0) |
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error(USER, "invalid radius scale"); |
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break; |
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|
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case 'n': |
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if ((numSpheres = parseMultiplier(argv [++arg])) <= 0) |
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error(USER, "invalid number of spheres"); |
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break; |
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|
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default: |
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sprintf(errmsg, "unknown option %s", argv [arg]); |
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error(USER, errmsg); |
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return -1; |
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} |
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|
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continue; |
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} |
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|
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/* Dump photon map */ |
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if (!(pmapFile = fopen(argv [arg], "rb"))) { |
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sprintf(errmsg, "can't open %s", argv [arg]); |
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error(SYSTEM, errmsg); |
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} |
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|
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/* Get format string */ |
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strcpy(format, PMAP_FORMAT_GLOB); |
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if (checkheader(pmapFile, format, NULL) != 1) { |
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sprintf(errmsg, "photon map file %s has unknown format %s", |
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argv [arg], format); |
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error(USER, errmsg); |
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} |
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|
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/* Identify photon map type from format string */ |
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for (ptype = 0; |
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strcmp(pmapFormat [ptype], format) && ptype < NUM_PMAP_TYPES; |
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ptype++); |
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|
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if (!validPmapType(ptype)) { |
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sprintf(errmsg, "file %s contains an unknown photon map type", |
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argv [arg]); |
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error(USER, errmsg); |
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} |
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|
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/* Get file format version and check for compatibility */ |
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if (getint(sizeof(PMAP_FILEVER), pmapFile) != PMAP_FILEVER) |
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error(USER, "incompatible photon map file format"); |
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|
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/* Dump command line as comment */ |
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fputs("# ", stdout); |
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printargs(argc, argv, stdout); |
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fputc('\n', stdout); |
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|
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/* Dump material def */ |
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fputs(radDefs [ptype].mat, stdout); |
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fputc('\n', stdout); |
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|
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/* Get number of photons (is this sizeof() hack portable?) */ |
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numPhotons = getint(sizeof(((PhotonMap*)NULL) -> heapSize), pmapFile); |
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|
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/* Skip avg photon flux */ |
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for (j = 0; j < 3; j++) |
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getflt(pmapFile); |
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|
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/* Get distribution extent (min & max photon positions) */ |
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for (j = 0; j < 3; j++) { |
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minPos [j] = getflt(pmapFile); |
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maxPos [j] = getflt(pmapFile); |
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} |
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|
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/* Skip centre of gravity, and avg photon dist to it */ |
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for (j = 0; j < 4; j++) |
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getflt(pmapFile); |
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|
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/* Sphere radius based on avg intersphere dist |
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(= sphere distrib density ^-1/3) */ |
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vol = (maxPos [0] - minPos [0]) * (maxPos [1] - minPos [1]) * |
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(maxPos [2] - minPos [2]); |
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rad = radScale * RADCOEFF * pow(vol / numSpheres, 1./3.); |
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|
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/* Photon dump probability to satisfy target sphere count */ |
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dumpRatio = numSpheres < numPhotons ? (float)numSpheres / numPhotons |
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: 1; |
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|
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while (numPhotons-- > 0) { |
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/* Get photon position */ |
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for (j = 0; j < 3; j++) |
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p.pos [j] = getflt(pmapFile); |
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|
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/* Dump photon probabilistically acc. to target sphere count */ |
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if (frandom() <= dumpRatio) { |
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printf(radDefs [ptype].obj, p.pos [0], p.pos [1], p.pos [2], rad); |
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fputc('\n', stdout); |
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} |
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|
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/* Skip photon normal and flux */ |
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for (j = 0; j < 3; j++) |
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getint(sizeof(p.norm [j]), pmapFile); |
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|
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#ifdef PMAP_FLOAT_FLUX |
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for (j = 0; j < 3; j++) |
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getflt(pmapFile); |
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#else |
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for (j = 0; j < 4; j++) |
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getint(1, pmapFile); |
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#endif |
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|
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/* Skip primary ray index */ |
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getint(sizeof(p.primary), pmapFile); |
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|
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/* Skip flags */ |
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getint(sizeof(p.flags), pmapFile); |
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|
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if (feof(pmapFile)) { |
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sprintf(errmsg, "error reading %s", argv [arg]); |
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error(USER, errmsg); |
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} |
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} |
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|
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fclose(pmapFile); |
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|
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/* Reset defaults for next dump */ |
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radScale = RADSCALE; |
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numSpheres = NSPHERES; |
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} |
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|
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return 0; |
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} |
