| 1 |
#ifndef lint
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| 2 |
static const char RCSid[] = "$Id: pmapdata.c,v 2.22 2020/04/08 15:14:21 rschregle Exp $";
|
| 3 |
#endif
|
| 4 |
|
| 5 |
/*
|
| 6 |
=========================================================================
|
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Photon map types and interface to nearest neighbour lookups in underlying
|
| 8 |
point cloud data structure.
|
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|
| 10 |
The default data structure is an in-core kd-tree (see pmapkdt.{h,c}).
|
| 11 |
This can be overriden with the PMAP_OOC compiletime switch, which enables
|
| 12 |
an out-of-core octree (see oococt.{h,c}).
|
| 13 |
|
| 14 |
Roland Schregle (roland.schregle@{hslu.ch, gmail.com})
|
| 15 |
(c) Fraunhofer Institute for Solar Energy Systems,
|
| 16 |
supported by the German Research Foundation
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(DFG LU-204/10-2, "Fassadenintegrierte Regelsysteme" (FARESYS))
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| 18 |
(c) Lucerne University of Applied Sciences and Arts,
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| 19 |
supported by the Swiss National Science Foundation
|
| 20 |
(SNSF #147053, "Daylight Redirecting Components")
|
| 21 |
==========================================================================
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|
| 23 |
$Id: pmapdata.c,v 2.22 2020/04/08 15:14:21 rschregle Exp $
|
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*/
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|
| 28 |
#include "pmapdata.h"
|
| 29 |
#include "pmaprand.h"
|
| 30 |
#include "pmapmat.h"
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#include "otypes.h"
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#include "source.h"
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#include "rcontrib.h"
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#include "random.h"
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| 38 |
PhotonMap *photonMaps [NUM_PMAP_TYPES] = {
|
| 39 |
NULL, NULL, NULL, NULL, NULL, NULL
|
| 40 |
};
|
| 41 |
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| 43 |
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| 44 |
/* Include routines to handle underlying point cloud data structure */
|
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#ifdef PMAP_OOC
|
| 46 |
#include "pmapooc.c"
|
| 47 |
#else
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| 48 |
#include "pmapkdt.c"
|
| 49 |
#endif
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| 51 |
/* Ambient include/exclude set (from ambient.c) */
|
| 52 |
#ifndef MAXASET
|
| 53 |
#define MAXASET 4095
|
| 54 |
#endif
|
| 55 |
extern OBJECT ambset [MAXASET+1];
|
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| 57 |
/* Callback to print photon attributes acc. to user defined format */
|
| 58 |
int (*printPhoton)(RAY *r, Photon *p, PhotonMap *pm);
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|
| 60 |
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| 61 |
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| 62 |
void initPhotonMap (PhotonMap *pmap, PhotonMapType t)
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| 63 |
/* Init photon map 'n' stuff... */
|
| 64 |
{
|
| 65 |
if (!pmap)
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| 66 |
return;
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| 67 |
|
| 68 |
pmap -> numPhotons = 0;
|
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pmap -> biasCompHist = NULL;
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pmap -> maxPos [0] = pmap -> maxPos [1] = pmap -> maxPos [2] = -FHUGE;
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pmap -> minPos [0] = pmap -> minPos [1] = pmap -> minPos [2] = FHUGE;
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pmap -> minGathered = pmap -> maxGathered = pmap -> totalGathered = 0;
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pmap -> gatherTolerance = gatherTolerance;
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pmap -> minError = pmap -> maxError = pmap -> rmsError = 0;
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pmap -> numDensity = 0;
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pmap -> distribRatio = 1;
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pmap -> type = t;
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pmap -> squeue.node = NULL;
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| 79 |
pmap -> squeue.len = 0;
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| 80 |
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| 81 |
/* Init local RNG state */
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| 82 |
pmap -> randState [0] = 10243;
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pmap -> randState [1] = 39829;
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| 84 |
pmap -> randState [2] = 9433;
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pmapSeed(randSeed, pmap -> randState);
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| 86 |
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| 87 |
/* Set up type-specific photon lookup callback */
|
| 88 |
pmap -> lookup = pmapLookup [t];
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| 89 |
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| 90 |
/* Mark primary photon ray as unused */
|
| 91 |
pmap -> lastPrimary.srcIdx = -1;
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pmap -> numPrimary = 0;
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pmap -> primaries = NULL;
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| 94 |
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| 95 |
/* Init storage */
|
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pmap -> heap = NULL;
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pmap -> heapBuf = NULL;
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pmap -> heapBufLen = 0;
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#ifdef PMAP_OOC
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| 100 |
OOC_Null(&pmap -> store);
|
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#else
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| 102 |
kdT_Null(&pmap -> store);
|
| 103 |
#endif
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| 104 |
}
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| 105 |
|
| 106 |
|
| 107 |
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| 108 |
void initPhotonHeap (PhotonMap *pmap)
|
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{
|
| 110 |
int fdFlags;
|
| 111 |
|
| 112 |
if (!pmap)
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| 113 |
error(INTERNAL, "undefined photon map in initPhotonHeap");
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| 114 |
|
| 115 |
if (!pmap -> heap) {
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| 116 |
/* Open heap file */
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| 117 |
mktemp(strcpy(pmap -> heapFname, PMAP_TMPFNAME));
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| 118 |
if (!(pmap -> heap = fopen(pmap -> heapFname, "w+b")))
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| 119 |
error(SYSTEM, "failed opening heap file in initPhotonHeap");
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| 121 |
#ifdef F_SETFL /* XXX is there an alternate needed for Windows? */
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fdFlags = fcntl(fileno(pmap -> heap), F_GETFL);
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| 123 |
fcntl(fileno(pmap -> heap), F_SETFL, fdFlags | O_APPEND);
|
| 124 |
#endif/* ftruncate(fileno(pmap -> heap), 0); */
|
| 125 |
}
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| 126 |
}
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| 128 |
|
| 129 |
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| 130 |
void flushPhotonHeap (PhotonMap *pmap)
|
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{
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| 132 |
int fd;
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| 133 |
const unsigned long len = pmap -> heapBufLen * sizeof(Photon);
|
| 134 |
|
| 135 |
if (!pmap)
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| 136 |
error(INTERNAL, "undefined photon map in flushPhotonHeap");
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|
| 138 |
if (!pmap -> heap || !pmap -> heapBuf) {
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| 139 |
/* Silently ignore undefined heap
|
| 140 |
error(INTERNAL, "undefined heap in flushPhotonHeap"); */
|
| 141 |
return;
|
| 142 |
}
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| 144 |
/* Atomically seek and write block to heap */
|
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/* !!! Unbuffered I/O via pwrite() avoids potential race conditions
|
| 146 |
* !!! and buffer corruption which can occur with lseek()/fseek()
|
| 147 |
* !!! followed by write()/fwrite(). */
|
| 148 |
fd = fileno(pmap -> heap);
|
| 149 |
|
| 150 |
#ifdef DEBUG_PMAP
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| 151 |
sprintf(errmsg, "Proc %d: flushing %ld photons from pos %ld\n", getpid(),
|
| 152 |
pmap -> heapBufLen, lseek(fd, 0, SEEK_END) / sizeof(Photon));
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eputs(errmsg);
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#endif
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/*if (pwrite(fd, pmap -> heapBuf, len, lseek(fd, 0, SEEK_END)) != len) */
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| 157 |
if (write(fd, pmap -> heapBuf, len) != len)
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error(SYSTEM, "failed append to heap file in flushPhotonHeap");
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| 159 |
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#if NIX
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| 161 |
if (fsync(fd))
|
| 162 |
error(SYSTEM, "failed fsync in flushPhotonHeap");
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| 163 |
#endif
|
| 164 |
|
| 165 |
pmap -> heapBufLen = 0;
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}
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|
| 168 |
|
| 169 |
|
| 170 |
#ifdef DEBUG_PMAP
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static int checkPhotonHeap (FILE *file)
|
| 172 |
/* Check heap for nonsensical or duplicate photons */
|
| 173 |
{
|
| 174 |
Photon p, lastp;
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| 175 |
int i, dup;
|
| 176 |
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| 177 |
rewind(file);
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| 178 |
memset(&lastp, 0, sizeof(lastp));
|
| 179 |
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| 180 |
while (fread(&p, sizeof(p), 1, file)) {
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dup = 1;
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| 182 |
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| 183 |
for (i = 0; i <= 2; i++) {
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| 184 |
if (p.pos [i] < thescene.cuorg [i] ||
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p.pos [i] > thescene.cuorg [i] + thescene.cusize) {
|
| 186 |
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sprintf(errmsg, "corrupt photon in heap at [%f, %f, %f]\n",
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| 188 |
p.pos [0], p.pos [1], p.pos [2]);
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error(WARNING, errmsg);
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}
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| 191 |
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| 192 |
dup &= p.pos [i] == lastp.pos [i];
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}
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| 194 |
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| 195 |
if (dup) {
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sprintf(errmsg,
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"consecutive duplicate photon in heap at [%f, %f, %f]\n",
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p.pos [0], p.pos [1], p.pos [2]);
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error(WARNING, errmsg);
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}
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}
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return 0;
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}
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#endif
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int newPhoton (PhotonMap* pmap, const RAY* ray)
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{
|
| 211 |
unsigned i;
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Photon photon;
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COLOR photonFlux;
|
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/* Account for distribution ratio */
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if (!pmap || pmapRandom(pmap -> randState) > pmap -> distribRatio)
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return -1;
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/* Don't store on sources */
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if (ray -> robj > -1 && islight(objptr(ray -> ro -> omod) -> otype))
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return -1;
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| 223 |
/* Ignore photon if modifier in/outside exclude/include set */
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| 224 |
if (ambincl != -1 && ray -> ro &&
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| 225 |
ambincl != inset(ambset, ray -> ro -> omod))
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return -1;
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| 227 |
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| 228 |
if (pmapNumROI && pmapROI) {
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unsigned inROI = 0;
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FVECT photonDist;
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/* Store photon if within a region of interest (for ze Ecksperts!)
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Note size of spherical ROI is squared. */
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for (i = 0; !inROI && i < pmapNumROI; i++) {
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VSUB(photonDist, ray -> rop, pmapROI [i].pos);
|
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inROI = (
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PMAP_ROI_ISSPHERE(pmapROI + i)
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? DOT(photonDist, photonDist) <= pmapROI [i].siz [0]
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: fabs(photonDist [0]) <= pmapROI [i].siz [0] &&
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fabs(photonDist [1]) <= pmapROI [i].siz [1] &&
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| 242 |
fabs(photonDist [2]) <= pmapROI [i].siz [2]
|
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);
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| 244 |
}
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| 245 |
if (!inROI)
|
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return -1;
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| 247 |
}
|
| 248 |
|
| 249 |
/* Adjust flux according to distribution ratio and ray weight */
|
| 250 |
copycolor(photonFlux, ray -> rcol);
|
| 251 |
#if 0
|
| 252 |
/* Factored out ray -> rweight as deprecated (?) for pmap, and infact
|
| 253 |
erroneously attenuates volume photon flux based on extinction,
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| 254 |
which is already factored in by photonParticipate() */
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| 255 |
scalecolor(photonFlux,
|
| 256 |
ray -> rweight / (pmap -> distribRatio ? pmap -> distribRatio
|
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: 1));
|
| 258 |
#else
|
| 259 |
scalecolor(photonFlux,
|
| 260 |
1.0 / (pmap -> distribRatio ? pmap -> distribRatio : 1));
|
| 261 |
#endif
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| 262 |
setPhotonFlux(&photon, photonFlux);
|
| 263 |
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| 264 |
/* Set photon position and flags */
|
| 265 |
VCOPY(photon.pos, ray -> rop);
|
| 266 |
photon.flags = 0;
|
| 267 |
photon.caustic = PMAP_CAUSTICRAY(ray);
|
| 268 |
|
| 269 |
/* Set contrib photon's primary ray and subprocess index (the latter
|
| 270 |
* to linearise the primary ray indices after photon distribution is
|
| 271 |
* complete). Also set primary ray's source index, thereby marking it
|
| 272 |
* as used. */
|
| 273 |
if (isContribPmap(pmap)) {
|
| 274 |
photon.primary = pmap -> numPrimary;
|
| 275 |
photon.proc = PMAP_GETRAYPROC(ray);
|
| 276 |
pmap -> lastPrimary.srcIdx = ray -> rsrc;
|
| 277 |
}
|
| 278 |
else photon.primary = 0;
|
| 279 |
|
| 280 |
/* Set normal */
|
| 281 |
for (i = 0; i <= 2; i++)
|
| 282 |
photon.norm [i] = 127.0 * (isVolumePmap(pmap) ? ray -> rdir [i]
|
| 283 |
: ray -> ron [i]);
|
| 284 |
|
| 285 |
if (!pmap -> heapBuf) {
|
| 286 |
/* Lazily allocate heap buffa */
|
| 287 |
#if NIX
|
| 288 |
/* Randomise buffa size to temporally decorellate flushes in
|
| 289 |
* multiprocessing mode */
|
| 290 |
srandom(randSeed + getpid());
|
| 291 |
pmap -> heapBufSize = PMAP_HEAPBUFSIZE * (0.5 + frandom());
|
| 292 |
#else
|
| 293 |
/* Randomisation disabled for single processes on WIN; also useful
|
| 294 |
* for reproducability during debugging */
|
| 295 |
pmap -> heapBufSize = PMAP_HEAPBUFSIZE;
|
| 296 |
#endif
|
| 297 |
if (!(pmap -> heapBuf = calloc(pmap -> heapBufSize, sizeof(Photon))))
|
| 298 |
error(SYSTEM, "failed heap buffer allocation in newPhoton");
|
| 299 |
pmap -> heapBufLen = 0;
|
| 300 |
}
|
| 301 |
|
| 302 |
/* Photon initialised; now append to heap buffa */
|
| 303 |
memcpy(pmap -> heapBuf + pmap -> heapBufLen, &photon, sizeof(Photon));
|
| 304 |
|
| 305 |
if (++pmap -> heapBufLen >= pmap -> heapBufSize)
|
| 306 |
/* Heap buffa full, flush to heap file */
|
| 307 |
flushPhotonHeap(pmap);
|
| 308 |
|
| 309 |
pmap -> numPhotons++;
|
| 310 |
|
| 311 |
/* Print photon attributes */
|
| 312 |
if (printPhoton)
|
| 313 |
/* Non-const kludge */
|
| 314 |
printPhoton((RAY*)ray, &photon, pmap);
|
| 315 |
|
| 316 |
return 0;
|
| 317 |
}
|
| 318 |
|
| 319 |
|
| 320 |
|
| 321 |
void buildPhotonMap (PhotonMap *pmap, double *photonFlux,
|
| 322 |
PhotonPrimaryIdx *primaryOfs, unsigned nproc)
|
| 323 |
{
|
| 324 |
unsigned long n, nCheck = 0;
|
| 325 |
unsigned i;
|
| 326 |
Photon *p;
|
| 327 |
COLOR flux;
|
| 328 |
char nuHeapFname [sizeof(PMAP_TMPFNAME)];
|
| 329 |
FILE *nuHeap;
|
| 330 |
/* Need double here to reduce summation errors */
|
| 331 |
double avgFlux [3] = {0, 0, 0}, CoG [3] = {0, 0, 0}, CoGdist = 0;
|
| 332 |
FVECT d;
|
| 333 |
|
| 334 |
if (!pmap)
|
| 335 |
error(INTERNAL, "undefined photon map in buildPhotonMap");
|
| 336 |
|
| 337 |
/* Get number of photons from heapfile size */
|
| 338 |
if (fseek(pmap -> heap, 0, SEEK_END) < 0)
|
| 339 |
error(SYSTEM, "failed seek to end of photon heap in buildPhotonMap");
|
| 340 |
pmap -> numPhotons = ftell(pmap -> heap) / sizeof(Photon);
|
| 341 |
|
| 342 |
if (!pmap -> numPhotons)
|
| 343 |
error(INTERNAL, "empty photon map in buildPhotonMap");
|
| 344 |
|
| 345 |
if (!pmap -> heap)
|
| 346 |
error(INTERNAL, "no heap in buildPhotonMap");
|
| 347 |
|
| 348 |
#ifdef DEBUG_PMAP
|
| 349 |
eputs("Checking photon heap consistency...\n");
|
| 350 |
checkPhotonHeap(pmap -> heap);
|
| 351 |
|
| 352 |
sprintf(errmsg, "Heap contains %ld photons\n", pmap -> numPhotons);
|
| 353 |
eputs(errmsg);
|
| 354 |
#endif
|
| 355 |
|
| 356 |
/* Allocate heap buffa */
|
| 357 |
if (!pmap -> heapBuf) {
|
| 358 |
pmap -> heapBufSize = PMAP_HEAPBUFSIZE;
|
| 359 |
pmap -> heapBuf = calloc(pmap -> heapBufSize, sizeof(Photon));
|
| 360 |
if (!pmap -> heapBuf)
|
| 361 |
error(SYSTEM, "failed to allocate postprocessed photon heap in"
|
| 362 |
"buildPhotonMap");
|
| 363 |
}
|
| 364 |
|
| 365 |
/* We REALLY don't need yet another @%&*! heap just to hold the scaled
|
| 366 |
* photons, but can't think of a quicker fix... */
|
| 367 |
mktemp(strcpy(nuHeapFname, PMAP_TMPFNAME));
|
| 368 |
if (!(nuHeap = fopen(nuHeapFname, "w+b")))
|
| 369 |
error(SYSTEM, "failed to open postprocessed photon heap in "
|
| 370 |
"buildPhotonMap");
|
| 371 |
|
| 372 |
rewind(pmap -> heap);
|
| 373 |
|
| 374 |
#ifdef DEBUG_PMAP
|
| 375 |
eputs("Postprocessing photons...\n");
|
| 376 |
#endif
|
| 377 |
|
| 378 |
while (!feof(pmap -> heap)) {
|
| 379 |
#ifdef DEBUG_PMAP
|
| 380 |
printf("Reading %lu at %lu... ", pmap -> heapBufSize, ftell(pmap->heap));
|
| 381 |
#endif
|
| 382 |
pmap -> heapBufLen = fread(pmap -> heapBuf, sizeof(Photon),
|
| 383 |
pmap -> heapBufSize, pmap -> heap);
|
| 384 |
#ifdef DEBUG_PMAP
|
| 385 |
printf("Got %lu\n", pmap -> heapBufLen);
|
| 386 |
#endif
|
| 387 |
|
| 388 |
if (ferror(pmap -> heap))
|
| 389 |
error(SYSTEM, "failed to read photon heap in buildPhotonMap");
|
| 390 |
|
| 391 |
for (n = pmap -> heapBufLen, p = pmap -> heapBuf; n; n--, p++) {
|
| 392 |
/* Update min and max pos and set photon flux */
|
| 393 |
for (i = 0; i <= 2; i++) {
|
| 394 |
if (p -> pos [i] < pmap -> minPos [i])
|
| 395 |
pmap -> minPos [i] = p -> pos [i];
|
| 396 |
else if (p -> pos [i] > pmap -> maxPos [i])
|
| 397 |
pmap -> maxPos [i] = p -> pos [i];
|
| 398 |
|
| 399 |
/* Update centre of gravity with photon position */
|
| 400 |
CoG [i] += p -> pos [i];
|
| 401 |
}
|
| 402 |
|
| 403 |
if (primaryOfs)
|
| 404 |
/* Linearise photon primary index from subprocess index using the
|
| 405 |
* per-subprocess offsets in primaryOfs */
|
| 406 |
p -> primary += primaryOfs [p -> proc];
|
| 407 |
|
| 408 |
/* Scale photon's flux (hitherto normalised to 1 over RGB); in
|
| 409 |
* case of a contrib photon map, this is done per light source,
|
| 410 |
* and photonFlux is assumed to be an array */
|
| 411 |
getPhotonFlux(p, flux);
|
| 412 |
|
| 413 |
if (photonFlux) {
|
| 414 |
scalecolor(flux, photonFlux [isContribPmap(pmap) ?
|
| 415 |
photonSrcIdx(pmap, p) : 0]);
|
| 416 |
setPhotonFlux(p, flux);
|
| 417 |
}
|
| 418 |
|
| 419 |
/* Update average photon flux; need a double here */
|
| 420 |
addcolor(avgFlux, flux);
|
| 421 |
}
|
| 422 |
|
| 423 |
/* Write modified photons to new heap */
|
| 424 |
fwrite(pmap -> heapBuf, sizeof(Photon), pmap -> heapBufLen, nuHeap);
|
| 425 |
|
| 426 |
if (ferror(nuHeap))
|
| 427 |
error(SYSTEM, "failed postprocessing photon flux in "
|
| 428 |
"buildPhotonMap");
|
| 429 |
|
| 430 |
nCheck += pmap -> heapBufLen;
|
| 431 |
}
|
| 432 |
|
| 433 |
#ifdef DEBUG_PMAP
|
| 434 |
if (nCheck < pmap -> numPhotons)
|
| 435 |
error(INTERNAL, "truncated photon heap in buildPhotonMap");
|
| 436 |
#endif
|
| 437 |
|
| 438 |
/* Finalise average photon flux */
|
| 439 |
scalecolor(avgFlux, 1.0 / pmap -> numPhotons);
|
| 440 |
copycolor(pmap -> photonFlux, avgFlux);
|
| 441 |
|
| 442 |
/* Average photon positions to get centre of gravity */
|
| 443 |
for (i = 0; i < 3; i++)
|
| 444 |
pmap -> CoG [i] = CoG [i] /= pmap -> numPhotons;
|
| 445 |
|
| 446 |
rewind(pmap -> heap);
|
| 447 |
|
| 448 |
/* Compute average photon distance to centre of gravity */
|
| 449 |
while (!feof(pmap -> heap)) {
|
| 450 |
pmap -> heapBufLen = fread(pmap -> heapBuf, sizeof(Photon),
|
| 451 |
pmap -> heapBufSize, pmap -> heap);
|
| 452 |
|
| 453 |
for (n = pmap -> heapBufLen, p = pmap -> heapBuf; n; n--, p++) {
|
| 454 |
VSUB(d, p -> pos, CoG);
|
| 455 |
CoGdist += DOT(d, d);
|
| 456 |
}
|
| 457 |
}
|
| 458 |
|
| 459 |
pmap -> CoGdist = CoGdist /= pmap -> numPhotons;
|
| 460 |
|
| 461 |
/* Swap heaps, discarding unscaled photons */
|
| 462 |
fclose(pmap -> heap);
|
| 463 |
unlink(pmap -> heapFname);
|
| 464 |
pmap -> heap = nuHeap;
|
| 465 |
strcpy(pmap -> heapFname, nuHeapFname);
|
| 466 |
|
| 467 |
#ifdef PMAP_OOC
|
| 468 |
OOC_BuildPhotonMap(pmap, nproc);
|
| 469 |
#else
|
| 470 |
kdT_BuildPhotonMap(pmap);
|
| 471 |
#endif
|
| 472 |
|
| 473 |
/* Trash heap and its buffa */
|
| 474 |
free(pmap -> heapBuf);
|
| 475 |
fclose(pmap -> heap);
|
| 476 |
unlink(pmap -> heapFname);
|
| 477 |
pmap -> heap = NULL;
|
| 478 |
pmap -> heapBuf = NULL;
|
| 479 |
}
|
| 480 |
|
| 481 |
|
| 482 |
|
| 483 |
/* Dynamic max photon search radius increase and reduction factors */
|
| 484 |
#define PMAP_MAXDIST_INC 4
|
| 485 |
#define PMAP_MAXDIST_DEC 0.9
|
| 486 |
|
| 487 |
/* Num successful lookups before reducing in max search radius */
|
| 488 |
#define PMAP_MAXDIST_CNT 1000
|
| 489 |
|
| 490 |
/* Threshold below which we assume increasing max radius won't help */
|
| 491 |
#define PMAP_SHORT_LOOKUP_THRESH 1
|
| 492 |
|
| 493 |
/* Coefficient for adaptive maximum search radius */
|
| 494 |
#define PMAP_MAXDIST_COEFF 100
|
| 495 |
|
| 496 |
void findPhotons (PhotonMap* pmap, const RAY* ray)
|
| 497 |
{
|
| 498 |
int redo = 0;
|
| 499 |
|
| 500 |
if (!pmap -> squeue.len) {
|
| 501 |
/* Lazy init priority queue */
|
| 502 |
#ifdef PMAP_OOC
|
| 503 |
OOC_InitFindPhotons(pmap);
|
| 504 |
#else
|
| 505 |
kdT_InitFindPhotons(pmap);
|
| 506 |
#endif
|
| 507 |
pmap -> minGathered = pmap -> maxGather;
|
| 508 |
pmap -> maxGathered = pmap -> minGather;
|
| 509 |
pmap -> totalGathered = 0;
|
| 510 |
pmap -> numLookups = pmap -> numShortLookups = 0;
|
| 511 |
pmap -> shortLookupPct = 0;
|
| 512 |
pmap -> minError = FHUGE;
|
| 513 |
pmap -> maxError = -FHUGE;
|
| 514 |
pmap -> rmsError = 0;
|
| 515 |
/* SQUARED max search radius limit is based on avg photon distance to
|
| 516 |
* centre of gravity, unless fixed by user (maxDistFix > 0) */
|
| 517 |
pmap -> maxDist0 = pmap -> maxDist2Limit =
|
| 518 |
maxDistFix > 0 ? maxDistFix * maxDistFix
|
| 519 |
: PMAP_MAXDIST_COEFF * pmap -> squeue.len *
|
| 520 |
pmap -> CoGdist / pmap -> numPhotons;
|
| 521 |
}
|
| 522 |
|
| 523 |
do {
|
| 524 |
pmap -> squeue.tail = 0;
|
| 525 |
pmap -> maxDist2 = pmap -> maxDist0;
|
| 526 |
|
| 527 |
/* Search position is ray -> rorg for volume photons, since we have no
|
| 528 |
intersection point. Normals are ignored -- these are incident
|
| 529 |
directions). */
|
| 530 |
/* NOTE: status returned by XXX_FindPhotons() is currently ignored;
|
| 531 |
if no photons are found, an empty queue is returned under the
|
| 532 |
assumption all photons are too distant to contribute significant
|
| 533 |
flux. */
|
| 534 |
if (isVolumePmap(pmap)) {
|
| 535 |
#ifdef PMAP_OOC
|
| 536 |
OOC_FindPhotons(pmap, ray -> rorg, NULL);
|
| 537 |
#else
|
| 538 |
kdT_FindPhotons(pmap, ray -> rorg, NULL);
|
| 539 |
#endif
|
| 540 |
}
|
| 541 |
else {
|
| 542 |
#ifdef PMAP_OOC
|
| 543 |
OOC_FindPhotons(pmap, ray -> rop, ray -> ron);
|
| 544 |
#else
|
| 545 |
kdT_FindPhotons(pmap, ray -> rop, ray -> ron);
|
| 546 |
#endif
|
| 547 |
}
|
| 548 |
|
| 549 |
#ifdef PMAP_LOOKUP_INFO
|
| 550 |
fprintf(stderr, "%d/%d %s photons found within radius %.3f "
|
| 551 |
"at (%.2f,%.2f,%.2f) on %s\n", pmap -> squeue.tail,
|
| 552 |
pmap -> squeue.len, pmapName [pmap -> type], sqrt(pmap -> maxDist2),
|
| 553 |
ray -> rop [0], ray -> rop [1], ray -> rop [2],
|
| 554 |
ray -> ro ? ray -> ro -> oname : "<null>");
|
| 555 |
#endif
|
| 556 |
|
| 557 |
if (pmap -> squeue.tail < pmap -> squeue.len * pmap -> gatherTolerance) {
|
| 558 |
/* Short lookup; too few photons found */
|
| 559 |
if (pmap -> squeue.tail > PMAP_SHORT_LOOKUP_THRESH) {
|
| 560 |
/* Ignore short lookups which return fewer than
|
| 561 |
* PMAP_SHORT_LOOKUP_THRESH photons under the assumption there
|
| 562 |
* really are no photons in the vicinity, and increasing the max
|
| 563 |
* search radius therefore won't help */
|
| 564 |
#ifdef PMAP_LOOKUP_WARN
|
| 565 |
sprintf(errmsg,
|
| 566 |
"%d/%d %s photons found at (%.2f,%.2f,%.2f) on %s",
|
| 567 |
pmap -> squeue.tail, pmap -> squeue.len,
|
| 568 |
pmapName [pmap -> type],
|
| 569 |
ray -> rop [0], ray -> rop [1], ray -> rop [2],
|
| 570 |
ray -> ro ? ray -> ro -> oname : "<null>");
|
| 571 |
error(WARNING, errmsg);
|
| 572 |
#endif
|
| 573 |
|
| 574 |
/* Bail out after warning if maxDist is fixed */
|
| 575 |
if (maxDistFix > 0)
|
| 576 |
return;
|
| 577 |
|
| 578 |
if (pmap -> maxDist0 < pmap -> maxDist2Limit) {
|
| 579 |
/* Increase max search radius if below limit & redo search */
|
| 580 |
pmap -> maxDist0 *= PMAP_MAXDIST_INC;
|
| 581 |
#ifdef PMAP_LOOKUP_REDO
|
| 582 |
redo = 1;
|
| 583 |
#endif
|
| 584 |
#ifdef PMAP_LOOKUP_WARN
|
| 585 |
sprintf(errmsg,
|
| 586 |
redo ? "restarting photon lookup with max radius %.1e"
|
| 587 |
: "max photon lookup radius adjusted to %.1e",
|
| 588 |
pmap -> maxDist0);
|
| 589 |
error(WARNING, errmsg);
|
| 590 |
#endif
|
| 591 |
}
|
| 592 |
#ifdef PMAP_LOOKUP_REDO
|
| 593 |
else {
|
| 594 |
sprintf(errmsg, "max photon lookup radius clamped to %.1e",
|
| 595 |
pmap -> maxDist0);
|
| 596 |
error(WARNING, errmsg);
|
| 597 |
}
|
| 598 |
#endif
|
| 599 |
}
|
| 600 |
|
| 601 |
/* Reset successful lookup counter */
|
| 602 |
pmap -> numLookups = 0;
|
| 603 |
}
|
| 604 |
else {
|
| 605 |
/* Bail out after warning if maxDist is fixed */
|
| 606 |
if (maxDistFix > 0)
|
| 607 |
return;
|
| 608 |
|
| 609 |
/* Increment successful lookup counter and reduce max search radius if
|
| 610 |
* wraparound */
|
| 611 |
pmap -> numLookups = (pmap -> numLookups + 1) % PMAP_MAXDIST_CNT;
|
| 612 |
if (!pmap -> numLookups)
|
| 613 |
pmap -> maxDist0 *= PMAP_MAXDIST_DEC;
|
| 614 |
|
| 615 |
redo = 0;
|
| 616 |
}
|
| 617 |
|
| 618 |
} while (redo);
|
| 619 |
}
|
| 620 |
|
| 621 |
|
| 622 |
|
| 623 |
Photon *find1Photon (PhotonMap *pmap, const RAY* ray, Photon *photon)
|
| 624 |
{
|
| 625 |
/* Init (squared) search radius to avg photon dist to centre of gravity */
|
| 626 |
float maxDist2_0 = pmap -> CoGdist;
|
| 627 |
int found = 0;
|
| 628 |
#ifdef PMAP_LOOKUP_REDO
|
| 629 |
#define REDO 1
|
| 630 |
#else
|
| 631 |
#define REDO 0
|
| 632 |
#endif
|
| 633 |
|
| 634 |
do {
|
| 635 |
pmap -> maxDist2 = maxDist2_0;
|
| 636 |
#ifdef PMAP_OOC
|
| 637 |
found = OOC_Find1Photon(pmap, ray -> rop, ray -> ron, photon);
|
| 638 |
#else
|
| 639 |
found = kdT_Find1Photon(pmap, ray -> rop, ray -> ron, photon);
|
| 640 |
#endif
|
| 641 |
if (found < 0) {
|
| 642 |
/* Expand search radius to retry */
|
| 643 |
maxDist2_0 *= 2;
|
| 644 |
#ifdef PMAP_LOOKUP_WARN
|
| 645 |
sprintf(errmsg, "failed 1-NN photon lookup"
|
| 646 |
#ifdef PMAP_LOOKUP_REDO
|
| 647 |
", retrying with search radius %.2f", maxDist2_0
|
| 648 |
#endif
|
| 649 |
);
|
| 650 |
error(WARNING, errmsg);
|
| 651 |
#endif
|
| 652 |
}
|
| 653 |
} while (REDO && found < 0);
|
| 654 |
|
| 655 |
/* Return photon buffer containing valid photon, else NULL */
|
| 656 |
return found < 0 ? NULL : photon;
|
| 657 |
}
|
| 658 |
|
| 659 |
|
| 660 |
|
| 661 |
void getPhoton (PhotonMap *pmap, PhotonIdx idx, Photon *photon)
|
| 662 |
{
|
| 663 |
#ifdef PMAP_OOC
|
| 664 |
if (OOC_GetPhoton(pmap, idx, photon))
|
| 665 |
#else
|
| 666 |
if (kdT_GetPhoton(pmap, idx, photon))
|
| 667 |
#endif
|
| 668 |
error(INTERNAL, "failed photon lookup");
|
| 669 |
}
|
| 670 |
|
| 671 |
|
| 672 |
|
| 673 |
Photon *getNearestPhoton (const PhotonSearchQueue *squeue, PhotonIdx idx)
|
| 674 |
{
|
| 675 |
#ifdef PMAP_OOC
|
| 676 |
return OOC_GetNearestPhoton(squeue, idx);
|
| 677 |
#else
|
| 678 |
return kdT_GetNearestPhoton(squeue, idx);
|
| 679 |
#endif
|
| 680 |
}
|
| 681 |
|
| 682 |
|
| 683 |
|
| 684 |
PhotonIdx firstPhoton (const PhotonMap *pmap)
|
| 685 |
{
|
| 686 |
#ifdef PMAP_OOC
|
| 687 |
return OOC_FirstPhoton(pmap);
|
| 688 |
#else
|
| 689 |
return kdT_FirstPhoton(pmap);
|
| 690 |
#endif
|
| 691 |
}
|
| 692 |
|
| 693 |
|
| 694 |
|
| 695 |
void deletePhotons (PhotonMap* pmap)
|
| 696 |
{
|
| 697 |
#ifdef PMAP_OOC
|
| 698 |
OOC_Delete(&pmap -> store);
|
| 699 |
#else
|
| 700 |
kdT_Delete(&pmap -> store);
|
| 701 |
#endif
|
| 702 |
|
| 703 |
free(pmap -> squeue.node);
|
| 704 |
free(pmap -> biasCompHist);
|
| 705 |
|
| 706 |
pmap -> numPhotons = pmap -> minGather = pmap -> maxGather =
|
| 707 |
pmap -> squeue.len = pmap -> squeue.tail = 0;
|
| 708 |
}
|
