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#ifndef lint |
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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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====================================================================== |
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Dump photon maps as RADIANCE scene description to stdout |
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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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supported by the Swiss National Science Foundation (SNSF, #147053) |
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====================================================================== |
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$Id$ |
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*/ |
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#include "random.h" |
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#include "math.h" |
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#define PMAPDUMP_REC "$Revision$" |
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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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} RadianceDef; |
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static char header [] = "$Revision$"; |
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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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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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char format [MAXFMTLEN]; |
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RREAL rad, radScale = RADSCALE, extent, dumpRatio; |
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unsigned arg, j, ptype, dim; |
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long numSpheres = NSPHERES; |
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FILE *pmapFile; |
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PhotonMap pm; |
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PhotonPrimary pri; |
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Photon p; |
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#ifdef PMAP_OOC |
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char leafFname [1024]; |
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#endif |
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if (argc < 2) { |
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puts("Dump photon maps as RADIANCE scene description\n"); |
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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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if (strcmp(getstr(format, pmapFile), PMAP_FILEVER)) |
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error(USER, "incompatible photon map file format"); |
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/* Dump command line as comment */ |
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fputs(radDefs [ptype].mat, stdout); |
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fputc('\n', stdout); |
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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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/* Get number of photons */ |
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pm.numPhotons = getint(sizeof(pm.numPhotons), pmapFile); |
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/* Skip avg photon flux */ |
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for (j = 0; j < 3; j++) |
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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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pm.minPos [j] = getflt(pmapFile); |
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pm.maxPos [j] = getflt(pmapFile); |
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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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/* 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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/* Sphere radius based on avg intersphere dist depending on |
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whether the distribution occupies a 1D line (!), a 2D plane, |
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or 3D volume (= sphere distrib density ^-1/d, where d is the |
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dimensionality of the distribution) */ |
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for (j = 0, extent = 1.0, dim = 0; j < 3; j++) { |
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rad = pm.maxPos [j] - pm.minPos [j]; |
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if (rad > FTINY) { |
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dim++; |
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extent *= rad; |
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} |
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} |
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rad = radScale * RADCOEFF * pow(extent / numSpheres, 1./dim); |
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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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dumpRatio = numSpheres < pm.numPhotons |
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? (float)numSpheres / pm.numPhotons : 1; |
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while (numPhotons-- > 0) { |
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/* Skip primary rays */ |
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pm.numPrimary = getint(sizeof(pm.numPrimary), pmapFile); |
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while (pm.numPrimary-- > 0) { |
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/* Skip source index & incident dir */ |
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getint(sizeof(pri.srcIdx), pmapFile); |
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#ifdef PMAP_PRIMARYDIR |
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/* Skip primary incident dir */ |
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getint(sizeof(pri.dir), pmapFile); |
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#endif |
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#ifdef PMAP_PRIMARYPOS |
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/* Skip primary hitpoint */ |
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for (j = 0; j < 3; j++) |
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getflt(pmapFile); |
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#endif |
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} |
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#ifdef PMAP_OOC |
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/* Open leaf file with filename derived from pmap, replace pmapFile |
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* (which is currently the node file) */ |
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strncpy(leafFname, argv [arg], 1024); |
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strncat(leafFname, PMAP_OOC_LEAFSUFFIX, 1024); |
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fclose(pmapFile); |
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if (!(pmapFile = fopen(leafFname, "rb"))) { |
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sprintf(errmsg, "cannot open leaf file %s", leafFname); |
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error(SYSTEM, errmsg); |
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} |
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#endif |
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/* Load photons */ |
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while (pm.numPhotons-- > 0) { |
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#ifdef PMAP_OOC |
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/* Get entire photon record |
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!!! OOC PMAP FILES CURRENTLY DON'T USE PORTABLE I/O !!! */ |
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if (!fread(&p, sizeof(p), 1, pmapFile)) { |
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sprintf(errmsg, "error reading OOC leaf file %s", leafFname); |
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error(SYSTEM, errmsg); |
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} |
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#else |
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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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#endif |
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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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#ifndef PMAP_OOC |
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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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#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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#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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/* Skip primary ray index */ |
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getint(sizeof(p.primary), pmapFile); |
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/* Skip flags */ |
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getint(sizeof(p.flags), pmapFile); |
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#endif |
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if (feof(pmapFile)) { |
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if (ferror(pmapFile) || feof(pmapFile)) { |
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sprintf(errmsg, "error reading %s", argv [arg]); |
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error(USER, errmsg); |
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} |
