| 1 |
greg |
2.1 |
#ifndef lint |
| 2 |
rschregle |
2.4 |
static const char RCSid[] = "$Id: pmcontrib2.c,v 2.3 2017/08/14 21:12:10 rschregle Exp $"; |
| 3 |
greg |
2.1 |
#endif |
| 4 |
|
|
|
| 5 |
|
|
/* |
| 6 |
|
|
====================================================================== |
| 7 |
|
|
Photon map support for using light source contributions |
| 8 |
|
|
|
| 9 |
|
|
Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) |
| 10 |
|
|
(c) Lucerne University of Applied Sciences and Arts, |
| 11 |
|
|
supported by the Swiss National Science Foundation (SNSF, #147053) |
| 12 |
|
|
====================================================================== |
| 13 |
|
|
|
| 14 |
rschregle |
2.4 |
$Id: pmcontrib2.c,v 2.3 2017/08/14 21:12:10 rschregle Exp $ |
| 15 |
greg |
2.1 |
*/ |
| 16 |
|
|
|
| 17 |
|
|
|
| 18 |
|
|
#include "pmapcontrib.h" |
| 19 |
|
|
#include "pmapmat.h" |
| 20 |
|
|
#include "pmapsrc.h" |
| 21 |
|
|
#include "pmaprand.h" |
| 22 |
|
|
#include "pmapio.h" |
| 23 |
|
|
#include "pmapdiag.h" |
| 24 |
|
|
#include "rcontrib.h" |
| 25 |
|
|
#include "otypes.h" |
| 26 |
|
|
|
| 27 |
|
|
|
| 28 |
|
|
|
| 29 |
|
|
static void setPmapContribParams (PhotonMap *pmap, LUTAB *srcContrib) |
| 30 |
|
|
/* Set parameters for light source contributions */ |
| 31 |
|
|
{ |
| 32 |
|
|
/* Set light source modifier list and appropriate callback to extract |
| 33 |
|
|
* their contributions from the photon map */ |
| 34 |
|
|
if (pmap) { |
| 35 |
|
|
pmap -> srcContrib = srcContrib; |
| 36 |
|
|
pmap -> lookup = photonContrib; |
| 37 |
|
|
/* Ensure we get all requested photon contribs during lookups */ |
| 38 |
|
|
pmap -> gatherTolerance = 1.0; |
| 39 |
|
|
} |
| 40 |
|
|
} |
| 41 |
|
|
|
| 42 |
|
|
|
| 43 |
|
|
|
| 44 |
|
|
static void checkPmapContribs (const PhotonMap *pmap, LUTAB *srcContrib) |
| 45 |
|
|
/* Check modifiers for light source contributions */ |
| 46 |
|
|
{ |
| 47 |
|
|
const PhotonPrimary *primary = pmap -> primaries; |
| 48 |
|
|
PhotonPrimaryIdx i, found = 0; |
| 49 |
|
|
OBJREC *srcMod; |
| 50 |
|
|
|
| 51 |
|
|
/* Make sure at least one of the modifiers is actually in the pmap, |
| 52 |
|
|
* otherwise findPhotons() winds up in an infinite loop! */ |
| 53 |
|
|
for (i = pmap -> numPrimary; i; --i, ++primary) { |
| 54 |
|
|
if (primary -> srcIdx < 0 || primary -> srcIdx >= nsources) |
| 55 |
|
|
error(INTERNAL, "invalid light source index in photon map"); |
| 56 |
|
|
|
| 57 |
|
|
srcMod = findmaterial(source [primary -> srcIdx].so); |
| 58 |
|
|
if ((MODCONT*)lu_find(srcContrib, srcMod -> oname) -> data) |
| 59 |
|
|
++found; |
| 60 |
|
|
} |
| 61 |
|
|
|
| 62 |
|
|
if (!found) |
| 63 |
|
|
error(USER, "modifiers not in photon map"); |
| 64 |
|
|
} |
| 65 |
|
|
|
| 66 |
|
|
|
| 67 |
|
|
|
| 68 |
|
|
void initPmapContrib (LUTAB *srcContrib, unsigned numSrcContrib) |
| 69 |
|
|
{ |
| 70 |
|
|
unsigned t; |
| 71 |
|
|
|
| 72 |
|
|
for (t = 0; t < NUM_PMAP_TYPES; t++) |
| 73 |
|
|
if (photonMaps [t] && t != PMAP_TYPE_CONTRIB) { |
| 74 |
|
|
sprintf(errmsg, "%s photon map does not support contributions", |
| 75 |
|
|
pmapName [t]); |
| 76 |
|
|
error(USER, errmsg); |
| 77 |
|
|
} |
| 78 |
|
|
|
| 79 |
|
|
/* Get params */ |
| 80 |
|
|
setPmapContribParams(contribPmap, srcContrib); |
| 81 |
|
|
|
| 82 |
|
|
if (contribPhotonMapping) { |
| 83 |
|
|
if (contribPmap -> maxGather < numSrcContrib) { |
| 84 |
rschregle |
2.3 |
#if 0 |
| 85 |
greg |
2.1 |
/* Adjust density estimate bandwidth if lower than modifier |
| 86 |
|
|
* count, otherwise contributions are missing */ |
| 87 |
|
|
error(WARNING, "contrib density estimate bandwidth too low, " |
| 88 |
|
|
"adjusting to modifier count"); |
| 89 |
|
|
contribPmap -> maxGather = numSrcContrib; |
| 90 |
rschregle |
2.3 |
#else |
| 91 |
|
|
/* Warn if density estimate bandwidth is lower than modifier |
| 92 |
|
|
* count, since some contributions will be missing */ |
| 93 |
|
|
error(WARNING, "photon density estimate bandwidth too low," |
| 94 |
|
|
" contributions may be underestimated"); |
| 95 |
|
|
#endif |
| 96 |
greg |
2.1 |
} |
| 97 |
|
|
|
| 98 |
|
|
/* Sanity check */ |
| 99 |
|
|
checkPmapContribs(contribPmap, srcContrib); |
| 100 |
|
|
} |
| 101 |
|
|
} |
| 102 |
|
|
|
| 103 |
|
|
|
| 104 |
|
|
|
| 105 |
|
|
void photonContrib (PhotonMap *pmap, RAY *ray, COLOR irrad) |
| 106 |
|
|
/* Sum up light source contributions from photons in pmap->srcContrib */ |
| 107 |
|
|
{ |
| 108 |
|
|
unsigned i; |
| 109 |
|
|
PhotonSearchQueueNode *sqn; |
| 110 |
rschregle |
2.4 |
float r2, invArea; |
| 111 |
greg |
2.1 |
RREAL rayCoeff [3]; |
| 112 |
|
|
Photon *photon; |
| 113 |
rschregle |
2.4 |
static char warnPos = 1, warnDir = 1; |
| 114 |
greg |
2.1 |
|
| 115 |
|
|
setcolor(irrad, 0, 0, 0); |
| 116 |
|
|
|
| 117 |
|
|
if (!pmap -> maxGather) |
| 118 |
|
|
return; |
| 119 |
|
|
|
| 120 |
|
|
/* Ignore sources */ |
| 121 |
|
|
if (ray -> ro && islight(objptr(ray -> ro -> omod) -> otype)) |
| 122 |
|
|
return; |
| 123 |
|
|
|
| 124 |
|
|
/* Get cumulative path coefficient up to photon lookup point */ |
| 125 |
|
|
raycontrib(rayCoeff, ray, PRIMARY); |
| 126 |
|
|
|
| 127 |
|
|
/* Lookup photons */ |
| 128 |
|
|
pmap -> squeue.tail = 0; |
| 129 |
|
|
findPhotons(pmap, ray); |
| 130 |
|
|
|
| 131 |
|
|
/* Need at least 2 photons */ |
| 132 |
|
|
if (pmap -> squeue.tail < 2) { |
| 133 |
|
|
#ifdef PMAP_NONEFOUND |
| 134 |
|
|
sprintf(errmsg, "no photons found on %s at (%.3f, %.3f, %.3f)", |
| 135 |
|
|
ray -> ro ? ray -> ro -> oname : "<null>", |
| 136 |
|
|
ray -> rop [0], ray -> rop [1], ray -> rop [2]); |
| 137 |
|
|
error(WARNING, errmsg); |
| 138 |
|
|
#endif |
| 139 |
|
|
|
| 140 |
|
|
return; |
| 141 |
|
|
} |
| 142 |
|
|
|
| 143 |
rschregle |
2.4 |
/* Average radius^2 between furthest two photons to improve accuracy and |
| 144 |
|
|
* get inverse search area 1 / (PI * r^2), with extra normalisation |
| 145 |
|
|
* factor 1 / PI for ambient calculation */ |
| 146 |
greg |
2.1 |
sqn = pmap -> squeue.node + 1; |
| 147 |
rschregle |
2.4 |
r2 = max(sqn -> dist2, (sqn + 1) -> dist2); |
| 148 |
|
|
r2 = 0.25 * (pmap -> maxDist2 + r2 + 2 * sqrt(pmap -> maxDist2 * r2)); |
| 149 |
|
|
invArea = 1 / (PI * PI * r2); |
| 150 |
greg |
2.1 |
|
| 151 |
|
|
/* Skip the extra photon */ |
| 152 |
|
|
for (i = 1 ; i < pmap -> squeue.tail; i++, sqn++) { |
| 153 |
|
|
COLOR flux; |
| 154 |
|
|
|
| 155 |
|
|
/* Get photon's contribution to density estimate */ |
| 156 |
|
|
photon = getNearestPhoton(&pmap -> squeue, sqn -> idx); |
| 157 |
|
|
getPhotonFlux(photon, flux); |
| 158 |
|
|
scalecolor(flux, invArea); |
| 159 |
|
|
#ifdef PMAP_EPANECHNIKOV |
| 160 |
|
|
/* Apply Epanechnikov kernel to photon flux based on photon distance */ |
| 161 |
rschregle |
2.4 |
scalecolor(flux, 2 * (1 - sqn -> dist2 / r2)); |
| 162 |
greg |
2.1 |
#endif |
| 163 |
|
|
addcolor(irrad, flux); |
| 164 |
|
|
|
| 165 |
|
|
if (pmap -> srcContrib) { |
| 166 |
|
|
const PhotonPrimary *primary = pmap -> primaries + |
| 167 |
|
|
photon -> primary; |
| 168 |
|
|
const SRCREC *sp = &source [primary -> srcIdx]; |
| 169 |
|
|
OBJREC *srcMod = findmaterial(sp -> so); |
| 170 |
|
|
MODCONT *srcContrib = (MODCONT*)lu_find(pmap -> srcContrib, |
| 171 |
|
|
srcMod -> oname) -> data; |
| 172 |
|
|
double srcBinReal; |
| 173 |
|
|
int srcBin; |
| 174 |
|
|
RAY srcRay; |
| 175 |
|
|
|
| 176 |
|
|
if (!srcContrib) |
| 177 |
|
|
continue; |
| 178 |
|
|
|
| 179 |
|
|
/* Photon's emitting light source has modifier whose contributions |
| 180 |
|
|
* are sought */ |
| 181 |
|
|
if (srcContrib -> binv -> type != NUM) { |
| 182 |
|
|
/* Use intersection function to set shadow ray parameters if |
| 183 |
|
|
* it's not simply a constant */ |
| 184 |
|
|
rayorigin(&srcRay, SHADOW, NULL, NULL); |
| 185 |
|
|
srcRay.rsrc = primary -> srcIdx; |
| 186 |
|
|
#ifdef PMAP_PRIMARYPOS |
| 187 |
|
|
VCOPY(srcRay.rorg, primary -> pos); |
| 188 |
|
|
#else |
| 189 |
|
|
/* No primary hitpoints; set dummy ray origin and warn once */ |
| 190 |
|
|
srcRay.rorg [0] = srcRay.rorg [1] = srcRay.rorg [2] = 0; |
| 191 |
rschregle |
2.4 |
if (warnPos) { |
| 192 |
|
|
error(WARNING, |
| 193 |
|
|
"no photon primary hitpoints for bin evaluation; " |
| 194 |
|
|
"using dummy (0,0,0)! Recompile with -DPMAP_CBDM."); |
| 195 |
|
|
warnPos = 0; |
| 196 |
greg |
2.1 |
} |
| 197 |
|
|
#endif |
| 198 |
rschregle |
2.4 |
#ifdef PMAP_PRIMARYDIR |
| 199 |
greg |
2.1 |
decodedir(srcRay.rdir, primary -> dir); |
| 200 |
rschregle |
2.4 |
#else |
| 201 |
|
|
/* No primary incident direction; set dummy and warn once */ |
| 202 |
|
|
if (warnDir) { |
| 203 |
|
|
error(WARNING, |
| 204 |
|
|
"no photon primary directions for bin evaluation; " |
| 205 |
|
|
"using dummy (0,0,0)! Recompile with -DPMAP_CBDM."); |
| 206 |
|
|
warnDir = 0; |
| 207 |
|
|
} |
| 208 |
|
|
srcRay.rdir [0] = srcRay.rdir [1] = srcRay.rdir [2] = 0; |
| 209 |
|
|
#endif |
| 210 |
greg |
2.1 |
|
| 211 |
|
|
if (!(sp->sflags & SDISTANT |
| 212 |
|
|
? sourcehit(&srcRay) |
| 213 |
|
|
: (*ofun[sp -> so -> otype].funp)(sp -> so, &srcRay))) |
| 214 |
|
|
continue; /* XXX shouldn't happen! */ |
| 215 |
|
|
|
| 216 |
|
|
worldfunc(RCCONTEXT, &srcRay); |
| 217 |
|
|
set_eparams((char *)srcContrib -> params); |
| 218 |
|
|
} |
| 219 |
|
|
|
| 220 |
|
|
if ((srcBinReal = evalue(srcContrib -> binv)) < -.5) |
| 221 |
|
|
continue; /* silently ignore negative bins */ |
| 222 |
|
|
|
| 223 |
|
|
if ((srcBin = srcBinReal + .5) >= srcContrib -> nbins) { |
| 224 |
|
|
error(WARNING, "bad bin number (ignored)"); |
| 225 |
|
|
continue; |
| 226 |
|
|
} |
| 227 |
|
|
|
| 228 |
|
|
if (!contrib) { |
| 229 |
|
|
/* Ray coefficient mode; normalise by light source radiance |
| 230 |
|
|
* after applying distrib pattern */ |
| 231 |
|
|
int j; |
| 232 |
|
|
|
| 233 |
|
|
raytexture(ray, srcMod -> omod); |
| 234 |
|
|
setcolor(ray -> rcol, srcMod -> oargs.farg [0], |
| 235 |
|
|
srcMod -> oargs.farg [1], srcMod -> oargs.farg [2]); |
| 236 |
|
|
multcolor(ray -> rcol, ray -> pcol); |
| 237 |
|
|
for (j = 0; j < 3; j++) |
| 238 |
|
|
flux [j] = ray -> rcol [j] ? flux [j] / ray -> rcol [j] : 0; |
| 239 |
|
|
} |
| 240 |
|
|
|
| 241 |
|
|
multcolor(flux, rayCoeff); |
| 242 |
|
|
addcolor(srcContrib -> cbin [srcBin], flux); |
| 243 |
|
|
} |
| 244 |
|
|
} |
| 245 |
|
|
|
| 246 |
|
|
return; |
| 247 |
|
|
} |
