| 1 |
greg |
2.1 |
/*
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| 2 |
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==================================================================
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| 3 |
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Photon map support for light source contributions
|
| 4 |
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| 5 |
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Roland Schregle (roland.schregle@{hslu.ch, gmail.com})
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| 6 |
rschregle |
2.4 |
(c) Lucerne University of Applied Sciences and Arts,
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| 7 |
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supported by the Swiss National Science Foundation (SNSF, #147053)
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| 8 |
greg |
2.1 |
==================================================================
|
| 9 |
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| 10 |
greg |
2.8 |
$Id: pmapcontrib.c,v 2.7 2015/05/20 14:44:12 greg Exp $
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| 11 |
greg |
2.1 |
*/
|
| 12 |
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| 13 |
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| 14 |
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#include "pmapcontrib.h"
|
| 15 |
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#include "pmap.h"
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| 16 |
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#include "pmapmat.h"
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| 17 |
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#include "pmapsrc.h"
|
| 18 |
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#include "pmaprand.h"
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| 19 |
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#include "pmapio.h"
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| 20 |
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#include "pmapdiag.h"
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| 21 |
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#include "rcontrib.h"
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| 22 |
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#include "otypes.h"
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| 23 |
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| 24 |
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| 25 |
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| 26 |
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static void setPmapContribParams (PhotonMap *pmap, LUTAB *srcContrib)
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| 27 |
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/* Set parameters for light source contributions */
|
| 28 |
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{
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| 29 |
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/* Set light source modifier list and appropriate callback to extract
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| 30 |
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* their contributions from the photon map */
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| 31 |
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if (pmap) {
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| 32 |
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pmap -> srcContrib = srcContrib;
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| 33 |
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pmap -> lookup = photonContrib;
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| 34 |
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/* Ensure we get all requested photon contribs during lookups */
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| 35 |
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pmap -> gatherTolerance = 1.0;
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| 36 |
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}
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| 37 |
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}
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| 38 |
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| 39 |
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| 40 |
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| 41 |
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static void checkPmapContribs (const PhotonMap *pmap, LUTAB *srcContrib)
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| 42 |
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/* Check modifiers for light source contributions */
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| 43 |
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{
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| 44 |
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const PhotonPrimary *primary = pmap -> primary;
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| 45 |
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OBJREC *srcMod;
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| 46 |
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unsigned long i, found = 0;
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| 47 |
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| 48 |
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/* Make sure at least one of the modifiers is actually in the pmap,
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| 49 |
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* otherwise findPhotons() winds up in an infinite loop! */
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| 50 |
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for (i = pmap -> primarySize; i; --i, ++primary) {
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| 51 |
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if (primary -> srcIdx < 0 || primary -> srcIdx >= nsources)
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| 52 |
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error(INTERNAL, "invalid light source index in photon map");
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| 53 |
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| 54 |
greg |
2.8 |
srcMod = findmaterial(source [primary -> srcIdx].so);
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| 55 |
greg |
2.1 |
if ((MODCONT*)lu_find(srcContrib, srcMod -> oname) -> data)
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| 56 |
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++found;
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| 57 |
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}
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| 58 |
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| 59 |
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if (!found)
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| 60 |
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error(USER, "modifiers not in photon map");
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| 61 |
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}
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| 62 |
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| 63 |
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| 64 |
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| 65 |
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void initPmapContrib (LUTAB *srcContrib, unsigned numSrcContrib)
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| 66 |
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{
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| 67 |
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unsigned t;
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| 68 |
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| 69 |
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for (t = 0; t < NUM_PMAP_TYPES; t++)
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| 70 |
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if (photonMaps [t] && t != PMAP_TYPE_CONTRIB) {
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| 71 |
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sprintf(errmsg, "%s photon map does not support contributions",
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| 72 |
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pmapName [t]);
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| 73 |
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error(USER, errmsg);
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| 74 |
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}
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| 75 |
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| 76 |
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/* Get params */
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| 77 |
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setPmapContribParams(contribPmap, srcContrib);
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| 78 |
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| 79 |
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if (contribPhotonMapping) {
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| 80 |
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if (contribPmap -> maxGather < numSrcContrib) {
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| 81 |
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/* Adjust density estimate bandwidth if lower than modifier
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| 82 |
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* count, otherwise contributions are missing */
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| 83 |
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error(WARNING, "contrib density estimate bandwidth too low, "
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| 84 |
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"adjusting to modifier count");
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| 85 |
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contribPmap -> maxGather = numSrcContrib;
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| 86 |
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}
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| 87 |
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| 88 |
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/* Sanity check */
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| 89 |
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checkPmapContribs(contribPmap, srcContrib);
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| 90 |
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}
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| 91 |
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}
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| 92 |
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| 93 |
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| 94 |
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| 95 |
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void photonContrib (PhotonMap *pmap, RAY *ray, COLOR irrad)
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| 96 |
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/* Sum up light source contributions from photons in pmap->srcContrib */
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| 97 |
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{
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| 98 |
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unsigned i;
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| 99 |
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PhotonSQNode *sq;
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| 100 |
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float r, invArea;
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| 101 |
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RREAL rayCoeff [3];
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| 102 |
greg |
2.5 |
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| 103 |
greg |
2.1 |
setcolor(irrad, 0, 0, 0);
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| 104 |
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| 105 |
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if (!pmap -> maxGather)
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| 106 |
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return;
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| 107 |
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| 108 |
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/* Ignore sources */
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| 109 |
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if (ray -> ro)
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| 110 |
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if (islight(objptr(ray -> ro -> omod) -> otype))
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| 111 |
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return;
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| 112 |
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| 113 |
greg |
2.5 |
/* Get cumulative path
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| 114 |
greg |
2.1 |
* coefficient up to photon lookup point */
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| 115 |
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raycontrib(rayCoeff, ray, PRIMARY);
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| 116 |
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| 117 |
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/* Lookup photons */
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| 118 |
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pmap -> squeueEnd = 0;
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| 119 |
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findPhotons(pmap, ray);
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| 120 |
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| 121 |
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/* Need at least 2 photons */
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| 122 |
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if (pmap -> squeueEnd < 2) {
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| 123 |
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#ifdef PMAP_NONEFOUND
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| 124 |
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sprintf(errmsg, "no photons found on %s at (%.3f, %.3f, %.3f)",
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ray -> ro ? ray -> ro -> oname : "<null>",
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| 126 |
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ray -> rop [0], ray -> rop [1], ray -> rop [2]);
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| 127 |
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error(WARNING, errmsg);
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| 128 |
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#endif
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| 129 |
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| 130 |
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return;
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| 131 |
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}
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| 132 |
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| 133 |
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/* Average (squared) radius between furthest two photons to improve
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| 134 |
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* accuracy and get inverse search area 1 / (PI * r^2), with extra
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| 135 |
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* normalisation factor 1 / PI for ambient calculation */
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| 136 |
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sq = pmap -> squeue + 1;
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| 137 |
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r = max(sq -> dist, (sq + 1) -> dist);
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| 138 |
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r = 0.25 * (pmap -> maxDist + r + 2 * sqrt(pmap -> maxDist * r));
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| 139 |
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invArea = 1 / (PI * PI * r);
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| 140 |
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| 141 |
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/* Skip the extra photon */
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| 142 |
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for (i = 1 ; i < pmap -> squeueEnd; i++, sq++) {
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| 143 |
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COLOR flux;
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| 144 |
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| 145 |
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/* Get photon's contribution to density estimate */
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| 146 |
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getPhotonFlux(sq -> photon, flux);
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| 147 |
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scalecolor(flux, invArea);
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| 148 |
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#ifdef PMAP_EPANECHNIKOV
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| 149 |
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/* Apply Epanechnikov kernel to photon flux (dists are squared) */
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| 150 |
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scalecolor(flux, 2 * (1 - sq -> dist / r));
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| 151 |
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#endif
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| 152 |
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addcolor(irrad, flux);
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| 153 |
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| 154 |
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if (pmap -> srcContrib) {
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| 155 |
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const PhotonPrimary *primary = pmap -> primary +
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| 156 |
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sq -> photon -> primary;
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| 157 |
greg |
2.7 |
const SRCREC *sp = &source[primary -> srcIdx];
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| 158 |
greg |
2.8 |
OBJREC *srcMod = findmaterial(sp -> so);
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| 159 |
greg |
2.1 |
MODCONT *srcContrib = (MODCONT*)lu_find(pmap -> srcContrib,
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| 160 |
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srcMod -> oname) -> data;
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| 161 |
greg |
2.6 |
if (!srcContrib)
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| 162 |
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continue;
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| 163 |
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| 164 |
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/* Photon's emitting light source has modifier whose
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| 165 |
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* contributions are sought */
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| 166 |
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double srcBinReal;
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| 167 |
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int srcBin;
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| 168 |
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RAY srcRay;
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| 169 |
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| 170 |
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if (srcContrib -> binv -> type != NUM) {
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| 171 |
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/* Use intersection function to set shadow ray parameters
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| 172 |
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* if it's not simply a constant
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| 173 |
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*/
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| 174 |
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rayorigin(&srcRay, SHADOW, NULL, NULL);
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| 175 |
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srcRay.rsrc = primary -> srcIdx;
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| 176 |
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VCOPY(srcRay.rorg, primary -> pos);
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| 177 |
greg |
2.7 |
decodedir(srcRay.rdir, primary -> dir);
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| 178 |
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| 179 |
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if (!(sp->sflags & SDISTANT ? sourcehit(&srcRay)
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| 180 |
|
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: (*ofun[sp -> so -> otype].funp)(sp -> so, &srcRay)))
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| 181 |
greg |
2.6 |
continue; /* XXX shouldn't happen! */
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| 182 |
greg |
2.7 |
|
| 183 |
greg |
2.6 |
worldfunc(RCCONTEXT, &srcRay);
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| 184 |
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set_eparams((char *)srcContrib -> params);
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| 185 |
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}
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| 186 |
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| 187 |
|
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if ((srcBinReal = evalue(srcContrib -> binv)) < -.5)
|
| 188 |
|
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continue; /* silently ignore negative bins */
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| 189 |
greg |
2.5 |
|
| 190 |
greg |
2.6 |
if ((srcBin = srcBinReal + .5) >= srcContrib -> nbins) {
|
| 191 |
|
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error(WARNING, "bad bin number (ignored)");
|
| 192 |
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continue;
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| 193 |
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}
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| 194 |
greg |
2.1 |
|
| 195 |
greg |
2.6 |
if (!contrib) {
|
| 196 |
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/* Ray coefficient mode; normalise by light source radiance
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| 197 |
|
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* after applying distrib pattern */
|
| 198 |
|
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int j;
|
| 199 |
|
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raytexture(ray, srcMod -> omod);
|
| 200 |
|
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setcolor(ray -> rcol, srcMod -> oargs.farg [0],
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| 201 |
greg |
2.1 |
srcMod -> oargs.farg [1], srcMod -> oargs.farg [2]);
|
| 202 |
greg |
2.6 |
multcolor(ray -> rcol, ray -> pcol);
|
| 203 |
|
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for (j = 0; j < 3; j++)
|
| 204 |
|
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flux [j] = ray -> rcol [j] ? flux [j] / ray -> rcol [j]
|
| 205 |
greg |
2.1 |
: 0;
|
| 206 |
greg |
2.6 |
}
|
| 207 |
greg |
2.1 |
|
| 208 |
greg |
2.6 |
multcolor(flux, rayCoeff);
|
| 209 |
|
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addcolor(srcContrib -> cbin [srcBin], flux);
|
| 210 |
greg |
2.1 |
}
|
| 211 |
|
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}
|
| 212 |
greg |
2.5 |
|
| 213 |
greg |
2.1 |
return;
|
| 214 |
|
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}
|
| 215 |
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|
| 216 |
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|
| 217 |
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|
| 218 |
|
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void distribPhotonContrib (PhotonMap* pm)
|
| 219 |
|
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{
|
| 220 |
|
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EmissionMap emap;
|
| 221 |
|
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char errmsg2 [128];
|
| 222 |
|
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unsigned srcIdx;
|
| 223 |
|
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double *srcFlux; /* Emitted flux per light source */
|
| 224 |
|
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const double srcDistribTarget = /* Target photon count per source */
|
| 225 |
|
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nsources ? (double)pm -> distribTarget / nsources : 0;
|
| 226 |
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|
| 227 |
|
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if (!pm)
|
| 228 |
|
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error(USER, "no photon map defined");
|
| 229 |
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|
| 230 |
|
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if (!nsources)
|
| 231 |
|
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error(USER, "no light sources");
|
| 232 |
|
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|
| 233 |
|
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/* Allocate photon flux per light source; this differs for every
|
| 234 |
|
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* source as all sources contribute the same number of distributed
|
| 235 |
|
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* photons (srcDistribTarget), hence the number of photons emitted per
|
| 236 |
|
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* source does not correlate with its emitted flux. The resulting flux
|
| 237 |
|
|
* per photon is therefore adjusted individually for each source. */
|
| 238 |
|
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if (!(srcFlux = calloc(nsources, sizeof(double))))
|
| 239 |
|
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error(SYSTEM, "cannot allocate source flux");
|
| 240 |
|
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|
| 241 |
|
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/* ================================================================
|
| 242 |
|
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* INITIALISASHUNN - Set up emisshunn and scattering funcs
|
| 243 |
|
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* ================================================================ */
|
| 244 |
|
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emap.samples = NULL;
|
| 245 |
|
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emap.src = NULL;
|
| 246 |
|
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emap.maxPartitions = MAXSPART;
|
| 247 |
|
|
emap.partitions = (unsigned char*)malloc(emap.maxPartitions >> 1);
|
| 248 |
|
|
if (!emap.partitions)
|
| 249 |
|
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error(USER, "can't allocate source partitions");
|
| 250 |
|
|
|
| 251 |
|
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initPhotonMap(pm, PMAP_TYPE_CONTRIB);
|
| 252 |
|
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initPhotonEmissionFuncs();
|
| 253 |
|
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initPhotonScatterFuncs();
|
| 254 |
|
|
|
| 255 |
|
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/* Get photon ports if specified */
|
| 256 |
|
|
if (ambincl == 1)
|
| 257 |
|
|
getPhotonPorts();
|
| 258 |
|
|
|
| 259 |
|
|
/* Get photon sensor modifiers */
|
| 260 |
|
|
getPhotonSensors(photonSensorList);
|
| 261 |
|
|
|
| 262 |
|
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/* Seed RNGs for photon distribution */
|
| 263 |
|
|
pmapSeed(randSeed, partState);
|
| 264 |
|
|
pmapSeed(randSeed, emitState);
|
| 265 |
|
|
pmapSeed(randSeed, cntState);
|
| 266 |
|
|
pmapSeed(randSeed, mediumState);
|
| 267 |
|
|
pmapSeed(randSeed, scatterState);
|
| 268 |
|
|
pmapSeed(randSeed, rouletteState);
|
| 269 |
|
|
|
| 270 |
|
|
/* Record start time and enable progress report signal handler */
|
| 271 |
|
|
repStartTime = time(NULL);
|
| 272 |
rschregle |
2.3 |
#ifdef SIGCONT
|
| 273 |
|
|
signal(SIGCONT, pmapDistribReport);
|
| 274 |
|
|
#endif
|
| 275 |
greg |
2.1 |
|
| 276 |
|
|
for (srcIdx = 0; srcIdx < nsources; srcIdx++) {
|
| 277 |
|
|
unsigned portCnt = 0, passCnt = 0, prePassCnt = 0;
|
| 278 |
|
|
double srcNumEmit = 0; /* # photons to emit from source */
|
| 279 |
|
|
unsigned long srcNumDistrib = pm -> heapEnd; /* # photons stored */
|
| 280 |
|
|
|
| 281 |
|
|
srcFlux [srcIdx] = repProgress = 0;
|
| 282 |
|
|
emap.src = source + srcIdx;
|
| 283 |
|
|
|
| 284 |
|
|
if (photonRepTime)
|
| 285 |
|
|
eputs("\n");
|
| 286 |
|
|
|
| 287 |
|
|
/* =============================================================
|
| 288 |
|
|
* FLUX INTEGRATION - Get total flux emitted from light source
|
| 289 |
|
|
* ============================================================= */
|
| 290 |
|
|
do {
|
| 291 |
|
|
emap.port = emap.src -> sflags & SDISTANT
|
| 292 |
|
|
? photonPorts + portCnt : NULL;
|
| 293 |
|
|
photonPartition [emap.src -> so -> otype] (&emap);
|
| 294 |
|
|
|
| 295 |
|
|
if (photonRepTime) {
|
| 296 |
|
|
sprintf(errmsg, "Integrating flux from source %s (mod %s) ",
|
| 297 |
|
|
source [srcIdx].so -> oname,
|
| 298 |
|
|
objptr(source [srcIdx].so -> omod) -> oname);
|
| 299 |
|
|
|
| 300 |
|
|
if (emap.port) {
|
| 301 |
|
|
sprintf(errmsg2, "via port %s ",
|
| 302 |
|
|
photonPorts [portCnt].so -> oname);
|
| 303 |
|
|
strcat(errmsg, errmsg2);
|
| 304 |
|
|
}
|
| 305 |
|
|
|
| 306 |
|
|
sprintf(errmsg2, "(%lu partitions)...\n",
|
| 307 |
|
|
emap.numPartitions);
|
| 308 |
|
|
strcat(errmsg, errmsg2);
|
| 309 |
|
|
eputs(errmsg);
|
| 310 |
|
|
fflush(stderr);
|
| 311 |
|
|
}
|
| 312 |
|
|
|
| 313 |
|
|
for (emap.partitionCnt = 0;
|
| 314 |
|
|
emap.partitionCnt < emap.numPartitions;
|
| 315 |
|
|
emap.partitionCnt++) {
|
| 316 |
|
|
initPhotonEmission(&emap, pdfSamples);
|
| 317 |
|
|
srcFlux [srcIdx] += colorAvg(emap.partFlux);
|
| 318 |
|
|
}
|
| 319 |
|
|
|
| 320 |
|
|
portCnt++;
|
| 321 |
|
|
} while (portCnt < numPhotonPorts);
|
| 322 |
|
|
|
| 323 |
|
|
if (srcFlux [srcIdx] < FTINY) {
|
| 324 |
|
|
sprintf(errmsg, "source %s has zero emission",
|
| 325 |
|
|
source [srcIdx].so -> oname);
|
| 326 |
|
|
error(WARNING, errmsg);
|
| 327 |
|
|
}
|
| 328 |
|
|
else {
|
| 329 |
|
|
/* ==========================================================
|
| 330 |
|
|
* 2-PASS PHOTON DISTRIBUTION
|
| 331 |
|
|
* Pass 1 (pre): emit fraction of target photon count
|
| 332 |
|
|
* Pass 2 (main): based on outcome of pass 1, estimate
|
| 333 |
|
|
* remaining number of photons to emit to
|
| 334 |
|
|
* approximate target count
|
| 335 |
|
|
* ========================================================== */
|
| 336 |
|
|
do {
|
| 337 |
|
|
if (!passCnt) {
|
| 338 |
|
|
/* INIT PASS 1 */
|
| 339 |
|
|
if (++prePassCnt > maxPreDistrib) {
|
| 340 |
|
|
/* Warn if no photons contributed after sufficient
|
| 341 |
|
|
* iterations */
|
| 342 |
|
|
sprintf(errmsg, "too many prepasses, no photons "
|
| 343 |
|
|
"from source %s", source [srcIdx].so -> oname);
|
| 344 |
|
|
error(WARNING, errmsg);
|
| 345 |
|
|
break;
|
| 346 |
|
|
}
|
| 347 |
|
|
|
| 348 |
|
|
/* Num to emit is fraction of target count */
|
| 349 |
|
|
srcNumEmit = preDistrib * srcDistribTarget;
|
| 350 |
|
|
}
|
| 351 |
|
|
|
| 352 |
|
|
else {
|
| 353 |
|
|
/* INIT PASS 2 */
|
| 354 |
|
|
/* Based on the outcome of the predistribution we can now
|
| 355 |
|
|
* figure out how many more photons we have to emit from
|
| 356 |
|
|
* the current source to meet the target count,
|
| 357 |
|
|
* srcDistribTarget. This value is clamped to 0 in case
|
| 358 |
|
|
* the target has already been exceeded in pass 1.
|
| 359 |
|
|
* srcNumEmit and srcNumDistrib is the number of photons
|
| 360 |
|
|
* emitted and distributed (stored) from the current
|
| 361 |
|
|
* source in pass 1, respectively. */
|
| 362 |
|
|
srcNumDistrib = pm -> heapEnd - srcNumDistrib;
|
| 363 |
|
|
srcNumEmit *= srcNumDistrib
|
| 364 |
|
|
? max(srcDistribTarget/srcNumDistrib, 1) - 1
|
| 365 |
|
|
: 0;
|
| 366 |
|
|
|
| 367 |
|
|
if (!srcNumEmit)
|
| 368 |
|
|
/* No photons left to distribute in main pass */
|
| 369 |
|
|
break;
|
| 370 |
|
|
}
|
| 371 |
|
|
|
| 372 |
|
|
/* Set completion count for progress report */
|
| 373 |
|
|
repComplete = srcNumEmit + repProgress;
|
| 374 |
|
|
portCnt = 0;
|
| 375 |
|
|
|
| 376 |
|
|
do {
|
| 377 |
|
|
emap.port = emap.src -> sflags & SDISTANT
|
| 378 |
|
|
? photonPorts + portCnt : NULL;
|
| 379 |
|
|
photonPartition [emap.src -> so -> otype] (&emap);
|
| 380 |
|
|
|
| 381 |
|
|
if (photonRepTime) {
|
| 382 |
|
|
if (!passCnt)
|
| 383 |
|
|
sprintf(errmsg, "PREPASS %d on source %s (mod %s) ",
|
| 384 |
|
|
prePassCnt, source [srcIdx].so -> oname,
|
| 385 |
|
|
objptr(source[srcIdx].so->omod) -> oname);
|
| 386 |
|
|
else
|
| 387 |
|
|
sprintf(errmsg, "MAIN PASS on source %s (mod %s) ",
|
| 388 |
|
|
source [srcIdx].so -> oname,
|
| 389 |
|
|
objptr(source[srcIdx].so->omod) -> oname);
|
| 390 |
|
|
|
| 391 |
|
|
if (emap.port) {
|
| 392 |
|
|
sprintf(errmsg2, "via port %s ",
|
| 393 |
|
|
photonPorts [portCnt].so -> oname);
|
| 394 |
|
|
strcat(errmsg, errmsg2);
|
| 395 |
|
|
}
|
| 396 |
|
|
|
| 397 |
|
|
sprintf(errmsg2, "(%lu partitions)...\n",
|
| 398 |
|
|
emap.numPartitions);
|
| 399 |
|
|
strcat(errmsg, errmsg2);
|
| 400 |
|
|
eputs(errmsg);
|
| 401 |
|
|
fflush(stderr);
|
| 402 |
|
|
}
|
| 403 |
|
|
|
| 404 |
|
|
for (emap.partitionCnt = 0;
|
| 405 |
|
|
emap.partitionCnt < emap.numPartitions;
|
| 406 |
|
|
emap.partitionCnt++) {
|
| 407 |
|
|
double partNumEmit;
|
| 408 |
|
|
unsigned long partEmitCnt;
|
| 409 |
|
|
|
| 410 |
|
|
/* Get photon origin within current source partishunn
|
| 411 |
|
|
* and build emission map */
|
| 412 |
|
|
photonOrigin [emap.src -> so -> otype] (&emap);
|
| 413 |
|
|
initPhotonEmission(&emap, pdfSamples);
|
| 414 |
|
|
|
| 415 |
|
|
/* Number of photons to emit from ziss partishunn;
|
| 416 |
|
|
* scale according to its normalised contribushunn to
|
| 417 |
|
|
* the emitted source flux */
|
| 418 |
|
|
partNumEmit = srcNumEmit * colorAvg(emap.partFlux) /
|
| 419 |
|
|
srcFlux [srcIdx];
|
| 420 |
|
|
partEmitCnt = (unsigned long)partNumEmit;
|
| 421 |
|
|
|
| 422 |
|
|
/* Probabilistically account for fractional photons */
|
| 423 |
|
|
if (pmapRandom(cntState) < partNumEmit - partEmitCnt)
|
| 424 |
|
|
partEmitCnt++;
|
| 425 |
|
|
|
| 426 |
|
|
/* Integer counter avoids FP rounding errors */
|
| 427 |
|
|
while (partEmitCnt--) {
|
| 428 |
|
|
RAY photonRay;
|
| 429 |
|
|
|
| 430 |
|
|
/* Emit photon according to PDF (if any), allocate
|
| 431 |
|
|
* associated primary ray, and trace through scene
|
| 432 |
|
|
* until absorbed/leaked */
|
| 433 |
|
|
emitPhoton(&emap, &photonRay);
|
| 434 |
|
|
addPhotonPrimary(pm, &photonRay);
|
| 435 |
|
|
tracePhoton(&photonRay);
|
| 436 |
|
|
|
| 437 |
|
|
/* Record progress */
|
| 438 |
|
|
repProgress++;
|
| 439 |
|
|
|
| 440 |
|
|
if (photonRepTime > 0 &&
|
| 441 |
|
|
time(NULL) >= repLastTime + photonRepTime)
|
| 442 |
|
|
pmapDistribReport();
|
| 443 |
rschregle |
2.3 |
#ifdef SIGCONT
|
| 444 |
greg |
2.1 |
else signal(SIGCONT, pmapDistribReport);
|
| 445 |
|
|
#endif
|
| 446 |
|
|
}
|
| 447 |
|
|
}
|
| 448 |
|
|
|
| 449 |
|
|
portCnt++;
|
| 450 |
|
|
} while (portCnt < numPhotonPorts);
|
| 451 |
|
|
|
| 452 |
|
|
if (pm -> heapEnd == srcNumDistrib)
|
| 453 |
|
|
/* Double preDistrib in case no photons were stored
|
| 454 |
|
|
* for this source and redo pass 1 */
|
| 455 |
|
|
preDistrib *= 2;
|
| 456 |
|
|
else {
|
| 457 |
|
|
/* Now do pass 2 */
|
| 458 |
|
|
passCnt++;
|
| 459 |
|
|
if (photonRepTime)
|
| 460 |
|
|
eputs("\n");
|
| 461 |
|
|
}
|
| 462 |
|
|
} while (passCnt < 2);
|
| 463 |
|
|
|
| 464 |
|
|
/* Flux per photon emitted from this source; repProgress is the
|
| 465 |
|
|
* number of emitted photons after both passes */
|
| 466 |
|
|
srcFlux [srcIdx] = repProgress ? srcFlux [srcIdx] / repProgress
|
| 467 |
|
|
: 0;
|
| 468 |
|
|
}
|
| 469 |
|
|
}
|
| 470 |
|
|
|
| 471 |
|
|
/* ================================================================
|
| 472 |
|
|
* POST-DISTRIBUTION - Set photon flux and build kd-tree, etc.
|
| 473 |
|
|
* ================================================================ */
|
| 474 |
rschregle |
2.3 |
#ifdef SIGCONT
|
| 475 |
|
|
signal(SIGCONT, SIG_DFL);
|
| 476 |
|
|
#endif
|
| 477 |
greg |
2.1 |
free(emap.samples);
|
| 478 |
|
|
|
| 479 |
|
|
if (!pm -> heapEnd)
|
| 480 |
|
|
error(USER, "empty photon map");
|
| 481 |
|
|
|
| 482 |
|
|
/* Check for valid primary photon rays */
|
| 483 |
|
|
if (!pm -> primary)
|
| 484 |
|
|
error(INTERNAL, "no primary rays in contribution photon map");
|
| 485 |
|
|
|
| 486 |
|
|
if (pm -> primary [pm -> primaryEnd].srcIdx < 0)
|
| 487 |
|
|
/* Last primary ray is unused, so decrement counter */
|
| 488 |
|
|
pm -> primaryEnd--;
|
| 489 |
|
|
|
| 490 |
|
|
if (photonRepTime) {
|
| 491 |
|
|
eputs("\nBuilding contrib photon heap...\n");
|
| 492 |
|
|
fflush(stderr);
|
| 493 |
|
|
}
|
| 494 |
|
|
|
| 495 |
|
|
balancePhotons(pm, srcFlux);
|
| 496 |
|
|
}
|
