1 |
greg |
2.9 |
#ifndef lint |
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rschregle |
2.11 |
static const char RCSid[] = "$Id: pmap.c,v 4.33.1.10 2016/05/11 12:50:54 taschreg Exp taschreg $"; |
3 |
greg |
2.9 |
#endif |
4 |
rschregle |
2.11 |
|
5 |
greg |
2.1 |
/* |
6 |
rschregle |
2.11 |
====================================================================== |
7 |
greg |
2.1 |
Photon map main module |
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Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) |
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(c) Fraunhofer Institute for Solar Energy Systems, |
11 |
rschregle |
2.4 |
(c) Lucerne University of Applied Sciences and Arts, |
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rschregle |
2.11 |
supported by the Swiss National Science Foundation (SNSF, #147053) |
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====================================================================== |
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greg |
2.1 |
|
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rschregle |
2.11 |
$Id: pmap.c,v 4.33.1.10 2016/05/11 12:50:54 taschreg Exp taschreg $ |
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greg |
2.1 |
*/ |
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#include "pmap.h" |
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#include "pmapmat.h" |
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#include "pmapsrc.h" |
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#include "pmaprand.h" |
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#include "pmapio.h" |
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#include "pmapbias.h" |
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#include "pmapdiag.h" |
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#include "otypes.h" |
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#include <time.h> |
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#include <sys/stat.h> |
30 |
rschregle |
2.11 |
#include <sys/mman.h> |
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#include <sys/wait.h> |
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greg |
2.1 |
|
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rschregle |
2.11 |
#define PMAP_REV "$Revision: 4.33.1.10 $" |
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2.1 |
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extern char *octname; |
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/* Photon map lookup functions per type */ |
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void (*pmapLookup [NUM_PMAP_TYPES])(PhotonMap*, RAY*, COLOR) = { |
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photonDensity, photonPreCompDensity, photonDensity, volumePhotonDensity, |
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photonDensity, NULL |
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}; |
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void colorNorm (COLOR c) |
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/* Normalise colour channels to average of 1 */ |
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{ |
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const float avg = colorAvg(c); |
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if (!avg) |
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return; |
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c [0] /= avg; |
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c [1] /= avg; |
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c [2] /= avg; |
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} |
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void loadPmaps (PhotonMap **pmaps, const PhotonMapParams *parm) |
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{ |
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unsigned t; |
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struct stat octstat, pmstat; |
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PhotonMap *pm; |
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PhotonMapType type; |
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for (t = 0; t < NUM_PMAP_TYPES; t++) |
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if (setPmapParam(&pm, parm + t)) { |
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/* Check if photon map newer than octree */ |
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rschregle |
2.4 |
if (pm -> fileName && octname && |
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!stat(pm -> fileName, &pmstat) && !stat(octname, &octstat) && |
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greg |
2.1 |
octstat.st_mtime > pmstat.st_mtime) { |
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sprintf(errmsg, "photon map in file %s may be stale", |
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pm -> fileName); |
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error(USER, errmsg); |
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} |
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/* Load photon map from file and get its type */ |
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if ((type = loadPhotonMap(pm, pm -> fileName)) == PMAP_TYPE_NONE) |
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error(USER, "failed loading photon map"); |
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/* Assign to appropriate photon map type (deleting previously |
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* loaded photon map of same type if necessary) */ |
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if (pmaps [type]) { |
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deletePhotons(pmaps [type]); |
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free(pmaps [type]); |
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} |
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pmaps [type] = pm; |
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/* Check for invalid density estimate bandwidth */ |
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rschregle |
2.11 |
if (pm -> maxGather > pm -> numPhotons) { |
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greg |
2.1 |
error(WARNING, "adjusting density estimate bandwidth"); |
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rschregle |
2.11 |
pm -> minGather = pm -> maxGather = pm -> numPhotons; |
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greg |
2.1 |
} |
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} |
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} |
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void savePmaps (const PhotonMap **pmaps, int argc, char **argv) |
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{ |
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unsigned t; |
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for (t = 0; t < NUM_PMAP_TYPES; t++) { |
108 |
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if (pmaps [t]) |
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greg |
2.7 |
savePhotonMap(pmaps [t], pmaps [t] -> fileName, argc, argv); |
110 |
greg |
2.1 |
} |
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} |
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void cleanUpPmaps (PhotonMap **pmaps) |
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{ |
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unsigned t; |
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for (t = 0; t < NUM_PMAP_TYPES; t++) { |
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if (pmaps [t]) { |
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deletePhotons(pmaps [t]); |
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free(pmaps [t]); |
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} |
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} |
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} |
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128 |
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static int photonParticipate (RAY *ray) |
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/* Trace photon through participating medium. Returns 1 if passed through, |
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or 0 if absorbed and $*%&ed. Analogon to rayparticipate(). */ |
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{ |
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int i; |
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RREAL cosTheta, cosPhi, du, dv; |
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const float cext = colorAvg(ray -> cext), |
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albedo = colorAvg(ray -> albedo); |
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FVECT u, v; |
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COLOR cvext; |
139 |
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140 |
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/* Mean free distance until interaction with medium */ |
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ray -> rmax = -log(pmapRandom(mediumState)) / cext; |
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143 |
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while (!localhit(ray, &thescene)) { |
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setcolor(cvext, exp(-ray -> rmax * ray -> cext [0]), |
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exp(-ray -> rmax * ray -> cext [1]), |
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exp(-ray -> rmax * ray -> cext [2])); |
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148 |
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/* Modify ray color and normalise */ |
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multcolor(ray -> rcol, cvext); |
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colorNorm(ray -> rcol); |
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VCOPY(ray -> rorg, ray -> rop); |
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153 |
rschregle |
2.11 |
if (albedo > FTINY && ray -> rlvl > 0) |
154 |
greg |
2.1 |
/* Add to volume photon map */ |
155 |
rschregle |
2.11 |
newPhoton(volumePmap, ray); |
156 |
greg |
2.1 |
|
157 |
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/* Absorbed? */ |
158 |
rschregle |
2.11 |
if (pmapRandom(rouletteState) > albedo) |
159 |
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return 0; |
160 |
greg |
2.1 |
|
161 |
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/* Colour bleeding without attenuation (?) */ |
162 |
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multcolor(ray -> rcol, ray -> albedo); |
163 |
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scalecolor(ray -> rcol, 1 / albedo); |
164 |
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165 |
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/* Scatter photon */ |
166 |
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cosTheta = ray -> gecc <= FTINY ? 2 * pmapRandom(scatterState) - 1 |
167 |
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: 1 / (2 * ray -> gecc) * |
168 |
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(1 + ray -> gecc * ray -> gecc - |
169 |
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(1 - ray -> gecc * ray -> gecc) / |
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(1 - ray -> gecc + 2 * ray -> gecc * |
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pmapRandom(scatterState))); |
172 |
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cosPhi = cos(2 * PI * pmapRandom(scatterState)); |
174 |
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du = dv = sqrt(1 - cosTheta * cosTheta); /* sin(theta) */ |
175 |
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du *= cosPhi; |
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dv *= sqrt(1 - cosPhi * cosPhi); /* sin(phi) */ |
177 |
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178 |
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/* Get axes u & v perpendicular to photon direction */ |
179 |
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i = 0; |
180 |
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do { |
181 |
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v [0] = v [1] = v [2] = 0; |
182 |
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v [i++] = 1; |
183 |
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fcross(u, v, ray -> rdir); |
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} while (normalize(u) < FTINY); |
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fcross(v, ray -> rdir, u); |
186 |
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for (i = 0; i < 3; i++) |
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ray -> rdir [i] = du * u [i] + dv * v [i] + |
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cosTheta * ray -> rdir [i]; |
190 |
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ray -> rlvl++; |
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ray -> rmax = -log(pmapRandom(mediumState)) / cext; |
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} |
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setcolor(cvext, exp(-ray -> rot * ray -> cext [0]), |
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exp(-ray -> rot * ray -> cext [1]), |
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exp(-ray -> rot * ray -> cext [2])); |
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/* Modify ray color and normalise */ |
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multcolor(ray -> rcol, cvext); |
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colorNorm(ray -> rcol); |
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202 |
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/* Passed through medium */ |
203 |
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return 1; |
204 |
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} |
205 |
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207 |
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208 |
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void tracePhoton (RAY *ray) |
209 |
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/* Follow photon as it bounces around... */ |
210 |
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{ |
211 |
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long mod; |
212 |
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OBJREC* mat; |
213 |
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214 |
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if (ray -> rlvl > photonMaxBounce) { |
215 |
rschregle |
2.5 |
#ifdef PMAP_RUNAWAY_WARN |
216 |
greg |
2.1 |
error(WARNING, "runaway photon!"); |
217 |
rschregle |
2.5 |
#endif |
218 |
greg |
2.1 |
return; |
219 |
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} |
220 |
rschregle |
2.5 |
|
221 |
greg |
2.1 |
if (colorAvg(ray -> cext) > FTINY && !photonParticipate(ray)) |
222 |
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return; |
223 |
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224 |
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if (localhit(ray, &thescene)) { |
225 |
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mod = ray -> ro -> omod; |
226 |
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227 |
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if ((ray -> clipset && inset(ray -> clipset, mod)) || mod == OVOID) { |
228 |
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/* Transfer ray if modifier is VOID or clipped within antimatta */ |
229 |
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RAY tray; |
230 |
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photonRay(ray, &tray, PMAP_XFER, NULL); |
231 |
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tracePhoton(&tray); |
232 |
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} |
233 |
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else { |
234 |
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/* Scatter for modifier material */ |
235 |
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mat = objptr(mod); |
236 |
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photonScatter [mat -> otype] (mat, ray); |
237 |
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} |
238 |
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} |
239 |
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} |
240 |
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241 |
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242 |
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243 |
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static void preComputeGlobal (PhotonMap *pmap) |
244 |
rschregle |
2.11 |
/* Precompute irradiance from global photons for final gathering for |
245 |
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a random subset of finalGather * pmap -> numPhotons photons, and builds |
246 |
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the photon map, discarding the original photons. */ |
247 |
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/* !!! NOTE: PRECOMPUTATION WITH OOC CURRENTLY WITHOUT CACHE !!! */ |
248 |
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{ |
249 |
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unsigned long i, numPreComp; |
250 |
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unsigned j; |
251 |
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PhotonIdx pIdx; |
252 |
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Photon photon; |
253 |
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RAY ray; |
254 |
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PhotonMap nuPmap; |
255 |
greg |
2.1 |
|
256 |
rschregle |
2.11 |
repComplete = numPreComp = finalGather * pmap -> numPhotons; |
257 |
greg |
2.1 |
|
258 |
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if (photonRepTime) { |
259 |
rschregle |
2.11 |
sprintf(errmsg, "Precomputing irradiance for %ld global photons...\n", |
260 |
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numPreComp); |
261 |
greg |
2.1 |
eputs(errmsg); |
262 |
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fflush(stderr); |
263 |
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} |
264 |
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265 |
rschregle |
2.11 |
/* Copy photon map for precomputed photons */ |
266 |
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memcpy(&nuPmap, pmap, sizeof(PhotonMap)); |
267 |
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268 |
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/* Zero counters, init new heap and extents */ |
269 |
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nuPmap.numPhotons = 0; |
270 |
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initPhotonHeap(&nuPmap); |
271 |
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272 |
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for (j = 0; j < 3; j++) { |
273 |
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nuPmap.minPos [j] = FHUGE; |
274 |
|
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nuPmap.maxPos [j] = -FHUGE; |
275 |
greg |
2.1 |
} |
276 |
rschregle |
2.11 |
|
277 |
greg |
2.1 |
/* Record start time, baby */ |
278 |
|
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repStartTime = time(NULL); |
279 |
rschregle |
2.11 |
#ifdef SIGCONT |
280 |
|
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signal(SIGCONT, pmapPreCompReport); |
281 |
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#endif |
282 |
greg |
2.1 |
repProgress = 0; |
283 |
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284 |
rschregle |
2.11 |
photonRay(NULL, &ray, PRIMARY, NULL); |
285 |
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ray.ro = NULL; |
286 |
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287 |
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for (i = 0; i < numPreComp; i++) { |
288 |
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/* Get random photon from stratified distribution in source heap to |
289 |
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* avoid duplicates and clutering */ |
290 |
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pIdx = firstPhoton(pmap) + |
291 |
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(unsigned long)((i + pmapRandom(pmap -> randState)) / |
292 |
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finalGather); |
293 |
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getPhoton(pmap, pIdx, &photon); |
294 |
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295 |
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/* Init dummy photon ray with intersection at photon position */ |
296 |
|
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VCOPY(ray.rop, photon.pos); |
297 |
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for (j = 0; j < 3; j++) |
298 |
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ray.ron [j] = photon.norm [j] / 127.0; |
299 |
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300 |
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/* Get density estimate at photon position */ |
301 |
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photonDensity(pmap, &ray, ray.rcol); |
302 |
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303 |
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/* Append photon to new heap from ray */ |
304 |
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newPhoton(&nuPmap, &ray); |
305 |
greg |
2.1 |
|
306 |
rschregle |
2.11 |
/* Update progress */ |
307 |
greg |
2.1 |
repProgress++; |
308 |
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309 |
|
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if (photonRepTime > 0 && time(NULL) >= repLastTime + photonRepTime) |
310 |
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pmapPreCompReport(); |
311 |
rschregle |
2.11 |
#ifdef SIGCONT |
312 |
|
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else signal(SIGCONT, pmapPreCompReport); |
313 |
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#endif |
314 |
greg |
2.1 |
} |
315 |
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316 |
rschregle |
2.11 |
/* Flush heap */ |
317 |
|
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flushPhotonHeap(&nuPmap); |
318 |
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319 |
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#ifdef SIGCONT |
320 |
|
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signal(SIGCONT, SIG_DFL); |
321 |
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#endif |
322 |
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323 |
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/* Trash original pmap, replace with precomputed one */ |
324 |
|
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deletePhotons(pmap); |
325 |
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memcpy(pmap, &nuPmap, sizeof(PhotonMap)); |
326 |
greg |
2.1 |
|
327 |
|
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if (photonRepTime) { |
328 |
rschregle |
2.11 |
eputs("Rebuilding precomputed photon map...\n"); |
329 |
greg |
2.1 |
fflush(stderr); |
330 |
|
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} |
331 |
rschregle |
2.11 |
|
332 |
|
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/* Rebuild underlying data structure, destroying heap */ |
333 |
|
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buildPhotonMap(pmap, NULL, NULL, 1); |
334 |
greg |
2.1 |
} |
335 |
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336 |
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337 |
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338 |
rschregle |
2.11 |
typedef struct { |
339 |
|
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unsigned long numPhotons [NUM_PMAP_TYPES], |
340 |
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numEmitted, numComplete; |
341 |
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} PhotonCnt; |
342 |
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343 |
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344 |
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345 |
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void distribPhotons (PhotonMap **pmaps, unsigned numProc) |
346 |
|
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{ |
347 |
|
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EmissionMap emap; |
348 |
|
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char errmsg2 [128], shmFname [255]; |
349 |
|
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unsigned t, srcIdx, proc; |
350 |
|
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double totalFlux = 0; |
351 |
|
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int shmFile, stat, pid; |
352 |
|
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PhotonMap *pm; |
353 |
|
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PhotonCnt *photonCnt; |
354 |
greg |
2.1 |
|
355 |
rschregle |
2.8 |
for (t = 0; t < NUM_PMAP_TYPES && !pmaps [t]; t++); |
356 |
rschregle |
2.11 |
|
357 |
greg |
2.1 |
if (t >= NUM_PMAP_TYPES) |
358 |
rschregle |
2.11 |
error(USER, "no photon maps defined in distribPhotons"); |
359 |
greg |
2.1 |
|
360 |
|
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if (!nsources) |
361 |
rschregle |
2.11 |
error(USER, "no light sources in distribPhotons"); |
362 |
greg |
2.1 |
|
363 |
|
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/* =================================================================== |
364 |
|
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* INITIALISATION - Set up emission and scattering funcs |
365 |
|
|
* =================================================================== */ |
366 |
|
|
emap.samples = NULL; |
367 |
|
|
emap.maxPartitions = MAXSPART; |
368 |
|
|
emap.partitions = (unsigned char*)malloc(emap.maxPartitions >> 1); |
369 |
|
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if (!emap.partitions) |
370 |
rschregle |
2.11 |
error(INTERNAL, "can't allocate source partitions in distribPhotons"); |
371 |
greg |
2.1 |
|
372 |
|
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/* Initialise all defined photon maps */ |
373 |
|
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for (t = 0; t < NUM_PMAP_TYPES; t++) |
374 |
rschregle |
2.11 |
if (pmaps [t]) { |
375 |
|
|
initPhotonMap(pmaps [t], t); |
376 |
|
|
/* Open photon heapfile */ |
377 |
|
|
initPhotonHeap(pmaps [t]); |
378 |
|
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/* Per-subprocess target count */ |
379 |
|
|
pmaps [t] -> distribTarget /= numProc; |
380 |
|
|
} |
381 |
greg |
2.1 |
|
382 |
|
|
initPhotonEmissionFuncs(); |
383 |
|
|
initPhotonScatterFuncs(); |
384 |
|
|
|
385 |
|
|
/* Get photon ports if specified */ |
386 |
|
|
if (ambincl == 1) |
387 |
|
|
getPhotonPorts(); |
388 |
|
|
|
389 |
|
|
/* Get photon sensor modifiers */ |
390 |
|
|
getPhotonSensors(photonSensorList); |
391 |
|
|
|
392 |
rschregle |
2.11 |
/* Set up shared mem for photon counters (zeroed by ftruncate) */ |
393 |
|
|
#if 0 |
394 |
|
|
snprintf(shmFname, 255, PMAP_SHMFNAME, getpid()); |
395 |
|
|
shmFile = shm_open(shmFname, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR); |
396 |
|
|
#else |
397 |
|
|
strcpy(shmFname, PMAP_SHMFNAME); |
398 |
|
|
shmFile = mkstemp(shmFname); |
399 |
|
|
#endif |
400 |
|
|
|
401 |
|
|
if (shmFile < 0) |
402 |
|
|
error(SYSTEM, "failed opening shared memory file in distribPhotons"); |
403 |
|
|
|
404 |
|
|
if (ftruncate(shmFile, sizeof(*photonCnt)) < 0) |
405 |
|
|
error(SYSTEM, "failed setting shared memory size in distribPhotons"); |
406 |
|
|
|
407 |
|
|
photonCnt = mmap(NULL, sizeof(*photonCnt), PROT_READ | PROT_WRITE, |
408 |
|
|
MAP_SHARED, shmFile, 0); |
409 |
|
|
|
410 |
|
|
if (photonCnt == MAP_FAILED) |
411 |
|
|
error(SYSTEM, "failed mapping shared memory in distribPhotons"); |
412 |
|
|
|
413 |
greg |
2.1 |
if (photonRepTime) |
414 |
|
|
eputs("\n"); |
415 |
|
|
|
416 |
|
|
/* =================================================================== |
417 |
|
|
* FLUX INTEGRATION - Get total photon flux from light sources |
418 |
|
|
* =================================================================== */ |
419 |
rschregle |
2.11 |
for (srcIdx = 0; srcIdx < nsources; srcIdx++) { |
420 |
greg |
2.1 |
unsigned portCnt = 0; |
421 |
|
|
emap.src = source + srcIdx; |
422 |
|
|
|
423 |
rschregle |
2.11 |
do { /* Need at least one iteration if no ports! */ |
424 |
greg |
2.1 |
emap.port = emap.src -> sflags & SDISTANT ? photonPorts + portCnt |
425 |
|
|
: NULL; |
426 |
|
|
photonPartition [emap.src -> so -> otype] (&emap); |
427 |
|
|
|
428 |
|
|
if (photonRepTime) { |
429 |
|
|
sprintf(errmsg, "Integrating flux from source %s ", |
430 |
|
|
source [srcIdx].so -> oname); |
431 |
|
|
|
432 |
|
|
if (emap.port) { |
433 |
|
|
sprintf(errmsg2, "via port %s ", |
434 |
|
|
photonPorts [portCnt].so -> oname); |
435 |
|
|
strcat(errmsg, errmsg2); |
436 |
|
|
} |
437 |
|
|
|
438 |
|
|
sprintf(errmsg2, "(%lu partitions)...\n", emap.numPartitions); |
439 |
|
|
strcat(errmsg, errmsg2); |
440 |
|
|
eputs(errmsg); |
441 |
|
|
fflush(stderr); |
442 |
|
|
} |
443 |
|
|
|
444 |
|
|
for (emap.partitionCnt = 0; emap.partitionCnt < emap.numPartitions; |
445 |
|
|
emap.partitionCnt++) { |
446 |
|
|
initPhotonEmission(&emap, pdfSamples); |
447 |
|
|
totalFlux += colorAvg(emap.partFlux); |
448 |
|
|
} |
449 |
|
|
|
450 |
|
|
portCnt++; |
451 |
|
|
} while (portCnt < numPhotonPorts); |
452 |
|
|
} |
453 |
|
|
|
454 |
|
|
if (totalFlux < FTINY) |
455 |
|
|
error(USER, "zero flux from light sources"); |
456 |
|
|
|
457 |
rschregle |
2.11 |
/* MAIN LOOP */ |
458 |
|
|
for (proc = 0; proc < numProc; proc++) { |
459 |
|
|
if (!(pid = fork())) { |
460 |
|
|
/* SUBPROCESS ENTERS HERE. |
461 |
|
|
All opened and memory mapped files are inherited */ |
462 |
|
|
unsigned passCnt = 0, prePassCnt = 0; |
463 |
|
|
unsigned long lastNumPhotons [NUM_PMAP_TYPES]; |
464 |
|
|
unsigned long localNumEmitted = 0; /* Num photons emitted by this |
465 |
|
|
subprocess alone */ |
466 |
greg |
2.1 |
|
467 |
rschregle |
2.11 |
/* Seed RNGs from PID for decorellated photon distribution */ |
468 |
|
|
pmapSeed(randSeed + proc, partState); |
469 |
|
|
pmapSeed(randSeed + proc, emitState); |
470 |
|
|
pmapSeed(randSeed + proc, cntState); |
471 |
|
|
pmapSeed(randSeed + proc, mediumState); |
472 |
|
|
pmapSeed(randSeed + proc, scatterState); |
473 |
|
|
pmapSeed(randSeed + proc, rouletteState); |
474 |
greg |
2.1 |
|
475 |
|
|
for (t = 0; t < NUM_PMAP_TYPES; t++) |
476 |
rschregle |
2.11 |
lastNumPhotons [t] = 0; |
477 |
|
|
|
478 |
|
|
/* ============================================================= |
479 |
|
|
* 2-PASS PHOTON DISTRIBUTION |
480 |
|
|
* Pass 1 (pre): emit fraction of target photon count |
481 |
|
|
* Pass 2 (main): based on outcome of pass 1, estimate remaining |
482 |
|
|
* number of photons to emit to approximate target |
483 |
|
|
* count |
484 |
|
|
* ============================================================= */ |
485 |
greg |
2.1 |
do { |
486 |
rschregle |
2.11 |
double numEmit; |
487 |
greg |
2.1 |
|
488 |
rschregle |
2.11 |
if (!passCnt) { |
489 |
|
|
/* INIT PASS 1 */ |
490 |
|
|
/* Skip if no photons contributed after sufficient |
491 |
|
|
* iterations; make it clear to user which photon maps are |
492 |
|
|
* missing so (s)he can check geometry and materials */ |
493 |
|
|
if (++prePassCnt > maxPreDistrib) { |
494 |
|
|
sprintf(errmsg, |
495 |
|
|
"proc %d, source %s: too many prepasses", |
496 |
|
|
proc, source [srcIdx].so -> oname); |
497 |
|
|
|
498 |
|
|
for (t = 0; t < NUM_PMAP_TYPES; t++) |
499 |
|
|
if (pmaps [t] && !pmaps [t] -> numPhotons) { |
500 |
|
|
sprintf(errmsg2, ", no %s photons stored", |
501 |
|
|
pmapName [t]); |
502 |
|
|
strcat(errmsg, errmsg2); |
503 |
|
|
} |
504 |
|
|
|
505 |
|
|
error(USER, errmsg); |
506 |
|
|
break; |
507 |
greg |
2.1 |
} |
508 |
rschregle |
2.11 |
|
509 |
|
|
/* Num to emit is fraction of minimum target count */ |
510 |
|
|
numEmit = FHUGE; |
511 |
greg |
2.1 |
|
512 |
rschregle |
2.11 |
for (t = 0; t < NUM_PMAP_TYPES; t++) |
513 |
|
|
if (pmaps [t]) |
514 |
|
|
numEmit = min(pmaps [t] -> distribTarget, numEmit); |
515 |
|
|
|
516 |
|
|
numEmit *= preDistrib; |
517 |
greg |
2.1 |
} |
518 |
rschregle |
2.11 |
else { |
519 |
|
|
/* INIT PASS 2 */ |
520 |
|
|
/* Based on the outcome of the predistribution we can now |
521 |
|
|
* estimate how many more photons we have to emit for each |
522 |
|
|
* photon map to meet its respective target count. This |
523 |
|
|
* value is clamped to 0 in case the target has already been |
524 |
|
|
* exceeded in the pass 1. */ |
525 |
|
|
double maxDistribRatio = 0; |
526 |
|
|
|
527 |
|
|
/* Set the distribution ratio for each map; this indicates |
528 |
|
|
* how many photons of each respective type are stored per |
529 |
|
|
* emitted photon, and is used as probability for storing a |
530 |
|
|
* photon by newPhoton(). Since this biases the photon |
531 |
|
|
* density, newPhoton() promotes the flux of stored photons |
532 |
|
|
* to compensate. */ |
533 |
|
|
for (t = 0; t < NUM_PMAP_TYPES; t++) |
534 |
|
|
if ((pm = pmaps [t])) { |
535 |
|
|
pm -> distribRatio = (double)pm -> distribTarget / |
536 |
|
|
pm -> numPhotons - 1; |
537 |
|
|
|
538 |
|
|
/* Check if photon map "overflowed", i.e. exceeded its |
539 |
|
|
* target count in the prepass; correcting the photon |
540 |
|
|
* flux via the distribution ratio is no longer |
541 |
|
|
* possible, as no more photons of this type will be |
542 |
|
|
* stored, so notify the user rather than deliver |
543 |
|
|
* incorrect results. In future we should handle this |
544 |
|
|
* more intelligently by using the photonFlux in each |
545 |
|
|
* photon map to individually correct the flux after |
546 |
|
|
* distribution. */ |
547 |
|
|
if (pm -> distribRatio <= FTINY) { |
548 |
|
|
sprintf(errmsg, "%s photon map overflow in " |
549 |
|
|
"prepass, reduce -apD", pmapName [t]); |
550 |
|
|
error(INTERNAL, errmsg); |
551 |
|
|
} |
552 |
|
|
|
553 |
|
|
maxDistribRatio = max(pm -> distribRatio, |
554 |
|
|
maxDistribRatio); |
555 |
|
|
} |
556 |
greg |
2.1 |
|
557 |
rschregle |
2.11 |
/* Normalise distribution ratios and calculate number of |
558 |
|
|
* photons to emit in main pass */ |
559 |
|
|
for (t = 0; t < NUM_PMAP_TYPES; t++) |
560 |
|
|
if ((pm = pmaps [t])) |
561 |
|
|
pm -> distribRatio /= maxDistribRatio; |
562 |
|
|
|
563 |
|
|
if ((numEmit = localNumEmitted * maxDistribRatio) < FTINY) |
564 |
|
|
/* No photons left to distribute in main pass */ |
565 |
|
|
break; |
566 |
|
|
} |
567 |
|
|
|
568 |
|
|
/* Update shared completion counter for prog.report by parent */ |
569 |
|
|
photonCnt -> numComplete += numEmit; |
570 |
|
|
|
571 |
|
|
/* PHOTON DISTRIBUTION LOOP */ |
572 |
|
|
for (srcIdx = 0; srcIdx < nsources; srcIdx++) { |
573 |
|
|
unsigned portCnt = 0; |
574 |
|
|
emap.src = source + srcIdx; |
575 |
|
|
|
576 |
|
|
do { /* Need at least one iteration if no ports! */ |
577 |
|
|
emap.port = emap.src -> sflags & SDISTANT |
578 |
|
|
? photonPorts + portCnt : NULL; |
579 |
|
|
photonPartition [emap.src -> so -> otype] (&emap); |
580 |
|
|
|
581 |
|
|
if (photonRepTime && !proc) { |
582 |
|
|
if (!passCnt) |
583 |
|
|
sprintf(errmsg, "PREPASS %d on source %s ", |
584 |
|
|
prePassCnt, source [srcIdx].so -> oname); |
585 |
|
|
else |
586 |
|
|
sprintf(errmsg, "MAIN PASS on source %s ", |
587 |
|
|
source [srcIdx].so -> oname); |
588 |
|
|
|
589 |
|
|
if (emap.port) { |
590 |
|
|
sprintf(errmsg2, "via port %s ", |
591 |
|
|
photonPorts [portCnt].so -> oname); |
592 |
|
|
strcat(errmsg, errmsg2); |
593 |
|
|
} |
594 |
|
|
|
595 |
|
|
sprintf(errmsg2, "(%lu partitions)\n", |
596 |
|
|
emap.numPartitions); |
597 |
|
|
strcat(errmsg, errmsg2); |
598 |
|
|
eputs(errmsg); |
599 |
|
|
fflush(stderr); |
600 |
|
|
} |
601 |
greg |
2.1 |
|
602 |
rschregle |
2.11 |
for (emap.partitionCnt = 0; emap.partitionCnt < emap.numPartitions; |
603 |
|
|
emap.partitionCnt++) { |
604 |
|
|
double partNumEmit; |
605 |
|
|
unsigned long partEmitCnt; |
606 |
|
|
|
607 |
|
|
/* Get photon origin within current source partishunn |
608 |
|
|
* and build emission map */ |
609 |
|
|
photonOrigin [emap.src -> so -> otype] (&emap); |
610 |
|
|
initPhotonEmission(&emap, pdfSamples); |
611 |
|
|
|
612 |
|
|
/* Number of photons to emit from ziss partishunn -- |
613 |
|
|
* proportional to flux; photon ray weight and scalar |
614 |
|
|
* flux are uniform (the latter only varying in RGB). |
615 |
|
|
* */ |
616 |
|
|
partNumEmit = numEmit * colorAvg(emap.partFlux) / |
617 |
|
|
totalFlux; |
618 |
|
|
partEmitCnt = (unsigned long)partNumEmit; |
619 |
|
|
|
620 |
|
|
/* Probabilistically account for fractional photons */ |
621 |
|
|
if (pmapRandom(cntState) < partNumEmit - partEmitCnt) |
622 |
|
|
partEmitCnt++; |
623 |
|
|
|
624 |
|
|
/* Update local and shared (global) emission counter */ |
625 |
|
|
photonCnt -> numEmitted += partEmitCnt; |
626 |
|
|
localNumEmitted += partEmitCnt; |
627 |
|
|
|
628 |
|
|
/* Integer counter avoids FP rounding errors during |
629 |
|
|
* iteration */ |
630 |
|
|
while (partEmitCnt--) { |
631 |
|
|
RAY photonRay; |
632 |
|
|
|
633 |
|
|
/* Emit photon based on PDF and trace through scene |
634 |
|
|
* until absorbed/leaked */ |
635 |
|
|
emitPhoton(&emap, &photonRay); |
636 |
|
|
tracePhoton(&photonRay); |
637 |
|
|
} |
638 |
|
|
|
639 |
|
|
/* Update shared global photon count for each pmap */ |
640 |
|
|
for (t = 0; t < NUM_PMAP_TYPES; t++) |
641 |
|
|
if (pmaps [t]) { |
642 |
|
|
photonCnt -> numPhotons [t] += |
643 |
|
|
pmaps [t] -> numPhotons - lastNumPhotons [t]; |
644 |
|
|
lastNumPhotons [t] = pmaps [t] -> numPhotons; |
645 |
|
|
} |
646 |
|
|
} |
647 |
greg |
2.1 |
|
648 |
rschregle |
2.11 |
portCnt++; |
649 |
|
|
} while (portCnt < numPhotonPorts); |
650 |
|
|
} |
651 |
|
|
|
652 |
|
|
for (t = 0; t < NUM_PMAP_TYPES; t++) |
653 |
|
|
if (pmaps [t] && !pmaps [t] -> numPhotons) { |
654 |
|
|
/* Double preDistrib in case a photon map is empty and |
655 |
|
|
* redo pass 1 --> possibility of infinite loop for |
656 |
|
|
* pathological scenes (e.g. absorbing materials) */ |
657 |
|
|
preDistrib *= 2; |
658 |
|
|
break; |
659 |
greg |
2.1 |
} |
660 |
rschregle |
2.11 |
|
661 |
|
|
if (t >= NUM_PMAP_TYPES) { |
662 |
|
|
/* No empty photon maps found; now do pass 2 */ |
663 |
|
|
passCnt++; |
664 |
|
|
#if 0 |
665 |
|
|
if (photonRepTime) |
666 |
|
|
eputs("\n"); |
667 |
|
|
#endif |
668 |
greg |
2.1 |
} |
669 |
rschregle |
2.11 |
} while (passCnt < 2); |
670 |
|
|
|
671 |
|
|
/* Unmap shared photon counters */ |
672 |
|
|
#if 0 |
673 |
|
|
munmap(photonCnt, sizeof(*photonCnt)); |
674 |
|
|
close(shmFile); |
675 |
|
|
#endif |
676 |
|
|
|
677 |
|
|
/* Flush heap buffa for every pmap one final time; this is required |
678 |
|
|
* to prevent data corruption! */ |
679 |
|
|
for (t = 0; t < NUM_PMAP_TYPES; t++) |
680 |
|
|
if (pmaps [t]) { |
681 |
|
|
#if 0 |
682 |
|
|
eputs("Final flush\n"); |
683 |
|
|
#endif |
684 |
|
|
flushPhotonHeap(pmaps [t]); |
685 |
|
|
fclose(pmaps [t] -> heap); |
686 |
|
|
#ifdef DEBUG_PMAP |
687 |
|
|
sprintf(errmsg, "Proc %d: total %ld photons\n", getpid(), |
688 |
|
|
pmaps [t] -> numPhotons); |
689 |
|
|
eputs(errmsg); |
690 |
|
|
#endif |
691 |
|
|
} |
692 |
|
|
|
693 |
|
|
exit(0); |
694 |
greg |
2.1 |
} |
695 |
rschregle |
2.11 |
else if (pid < 0) |
696 |
|
|
error(SYSTEM, "failed to fork subprocess in distribPhotons"); |
697 |
|
|
} |
698 |
|
|
|
699 |
|
|
/* PARENT PROCESS CONTINUES HERE */ |
700 |
|
|
/* Record start time and enable progress report signal handler */ |
701 |
|
|
repStartTime = time(NULL); |
702 |
|
|
#ifdef SIGCONT |
703 |
|
|
signal(SIGCONT, pmapDistribReport); |
704 |
|
|
#endif |
705 |
|
|
|
706 |
|
|
if (photonRepTime) |
707 |
|
|
eputs("\n"); |
708 |
|
|
|
709 |
|
|
/* Wait for subprocesses to complete while reporting progress */ |
710 |
|
|
proc = numProc; |
711 |
|
|
while (proc) { |
712 |
|
|
while (waitpid(-1, &stat, WNOHANG) > 0) { |
713 |
|
|
/* Subprocess exited; check status */ |
714 |
|
|
if (!WIFEXITED(stat) || WEXITSTATUS(stat)) |
715 |
|
|
error(USER, "failed photon distribution"); |
716 |
|
|
|
717 |
|
|
--proc; |
718 |
|
|
} |
719 |
|
|
|
720 |
|
|
/* Nod off for a bit and update progress */ |
721 |
|
|
sleep(1); |
722 |
|
|
/* Update progress report from shared subprocess counters */ |
723 |
|
|
repEmitted = repProgress = photonCnt -> numEmitted; |
724 |
|
|
repComplete = photonCnt -> numComplete; |
725 |
|
|
|
726 |
greg |
2.1 |
for (t = 0; t < NUM_PMAP_TYPES; t++) |
727 |
rschregle |
2.11 |
if ((pm = pmaps [t])) { |
728 |
|
|
#if 0 |
729 |
|
|
/* Get photon count from heapfile size for progress update */ |
730 |
|
|
fseek(pm -> heap, 0, SEEK_END); |
731 |
|
|
pm -> numPhotons = ftell(pm -> heap) / sizeof(Photon); */ |
732 |
|
|
#else |
733 |
|
|
/* Get global photon count from shmem updated by subprocs */ |
734 |
|
|
pm -> numPhotons = photonCnt -> numPhotons [t]; |
735 |
|
|
#endif |
736 |
greg |
2.1 |
} |
737 |
rschregle |
2.11 |
|
738 |
|
|
if (photonRepTime > 0 && time(NULL) >= repLastTime + photonRepTime) |
739 |
|
|
pmapDistribReport(); |
740 |
|
|
#ifdef SIGCONT |
741 |
|
|
else signal(SIGCONT, pmapDistribReport); |
742 |
|
|
#endif |
743 |
|
|
} |
744 |
greg |
2.1 |
|
745 |
|
|
/* =================================================================== |
746 |
rschregle |
2.11 |
* POST-DISTRIBUTION - Set photon flux and build data struct for photon |
747 |
|
|
* storage, etc. |
748 |
greg |
2.1 |
* =================================================================== */ |
749 |
rschregle |
2.11 |
#ifdef SIGCONT |
750 |
|
|
signal(SIGCONT, SIG_DFL); |
751 |
|
|
#endif |
752 |
greg |
2.1 |
free(emap.samples); |
753 |
|
|
|
754 |
|
|
/* Set photon flux (repProgress is total num emitted) */ |
755 |
rschregle |
2.11 |
totalFlux /= photonCnt -> numEmitted; |
756 |
|
|
|
757 |
|
|
/* Photon counters no longer needed, unmap shared memory */ |
758 |
|
|
munmap(photonCnt, sizeof(*photonCnt)); |
759 |
|
|
close(shmFile); |
760 |
|
|
#if 0 |
761 |
|
|
shm_unlink(shmFname); |
762 |
|
|
#else |
763 |
|
|
unlink(shmFname); |
764 |
|
|
#endif |
765 |
greg |
2.1 |
|
766 |
|
|
for (t = 0; t < NUM_PMAP_TYPES; t++) |
767 |
rschregle |
2.8 |
if (pmaps [t]) { |
768 |
greg |
2.1 |
if (photonRepTime) { |
769 |
|
|
sprintf(errmsg, "\nBuilding %s photon map...\n", pmapName [t]); |
770 |
|
|
eputs(errmsg); |
771 |
|
|
fflush(stderr); |
772 |
|
|
} |
773 |
rschregle |
2.11 |
|
774 |
|
|
/* Build underlying data structure; heap is destroyed */ |
775 |
|
|
buildPhotonMap(pmaps [t], &totalFlux, NULL, numProc); |
776 |
greg |
2.1 |
} |
777 |
rschregle |
2.11 |
|
778 |
greg |
2.1 |
/* Precompute photon irradiance if necessary */ |
779 |
|
|
if (preCompPmap) |
780 |
|
|
preComputeGlobal(preCompPmap); |
781 |
|
|
} |
782 |
|
|
|
783 |
|
|
|
784 |
|
|
|
785 |
|
|
void photonDensity (PhotonMap *pmap, RAY *ray, COLOR irrad) |
786 |
|
|
/* Photon density estimate. Returns irradiance at ray -> rop. */ |
787 |
|
|
{ |
788 |
rschregle |
2.11 |
unsigned i; |
789 |
|
|
float r; |
790 |
|
|
COLOR flux; |
791 |
|
|
Photon *photon; |
792 |
|
|
const PhotonSearchQueueNode *sqn; |
793 |
greg |
2.1 |
|
794 |
|
|
setcolor(irrad, 0, 0, 0); |
795 |
|
|
|
796 |
|
|
if (!pmap -> maxGather) |
797 |
|
|
return; |
798 |
|
|
|
799 |
|
|
/* Ignore sources */ |
800 |
rschregle |
2.11 |
if (ray -> ro && islight(objptr(ray -> ro -> omod) -> otype)) |
801 |
|
|
return; |
802 |
greg |
2.1 |
|
803 |
|
|
findPhotons(pmap, ray); |
804 |
|
|
|
805 |
|
|
/* Need at least 2 photons */ |
806 |
rschregle |
2.11 |
if (pmap -> squeue.tail < 2) { |
807 |
|
|
#ifdef PMAP_NONEFOUND |
808 |
|
|
sprintf(errmsg, "no photons found on %s at (%.3f, %.3f, %.3f)", |
809 |
|
|
ray -> ro ? ray -> ro -> oname : "<null>", |
810 |
|
|
ray -> rop [0], ray -> rop [1], ray -> rop [2]); |
811 |
|
|
error(WARNING, errmsg); |
812 |
|
|
#endif |
813 |
greg |
2.1 |
|
814 |
|
|
return; |
815 |
|
|
} |
816 |
rschregle |
2.11 |
|
817 |
greg |
2.1 |
if (pmap -> minGather == pmap -> maxGather) { |
818 |
|
|
/* No bias compensation. Just do a plain vanilla estimate */ |
819 |
rschregle |
2.11 |
sqn = pmap -> squeue.node + 1; |
820 |
greg |
2.1 |
|
821 |
|
|
/* Average radius between furthest two photons to improve accuracy */ |
822 |
rschregle |
2.11 |
r = max(sqn -> dist2, (sqn + 1) -> dist2); |
823 |
|
|
r = 0.25 * (pmap -> maxDist2 + r + 2 * sqrt(pmap -> maxDist2 * r)); |
824 |
greg |
2.1 |
|
825 |
|
|
/* Skip the extra photon */ |
826 |
rschregle |
2.11 |
for (i = 1 ; i < pmap -> squeue.tail; i++, sqn++) { |
827 |
|
|
photon = getNearestPhoton(&pmap -> squeue, sqn -> idx); |
828 |
|
|
getPhotonFlux(photon, flux); |
829 |
greg |
2.1 |
#ifdef PMAP_EPANECHNIKOV |
830 |
rschregle |
2.11 |
/* Apply Epanechnikov kernel to photon flux based on photon dist */ |
831 |
|
|
scalecolor(flux, 2 * (1 - sqn -> dist2 / r)); |
832 |
|
|
#endif |
833 |
greg |
2.1 |
addcolor(irrad, flux); |
834 |
|
|
} |
835 |
|
|
|
836 |
|
|
/* Divide by search area PI * r^2, 1 / PI required as ambient |
837 |
|
|
normalisation factor */ |
838 |
|
|
scalecolor(irrad, 1 / (PI * PI * r)); |
839 |
|
|
|
840 |
|
|
return; |
841 |
|
|
} |
842 |
|
|
else |
843 |
|
|
/* Apply bias compensation to density estimate */ |
844 |
|
|
biasComp(pmap, irrad); |
845 |
|
|
} |
846 |
|
|
|
847 |
|
|
|
848 |
|
|
|
849 |
|
|
void photonPreCompDensity (PhotonMap *pmap, RAY *r, COLOR irrad) |
850 |
|
|
/* Returns precomputed photon density estimate at ray -> rop. */ |
851 |
|
|
{ |
852 |
rschregle |
2.11 |
Photon p; |
853 |
greg |
2.1 |
|
854 |
|
|
setcolor(irrad, 0, 0, 0); |
855 |
|
|
|
856 |
|
|
/* Ignore sources */ |
857 |
|
|
if (r -> ro && islight(objptr(r -> ro -> omod) -> otype)) |
858 |
|
|
return; |
859 |
|
|
|
860 |
rschregle |
2.11 |
find1Photon(preCompPmap, r, &p); |
861 |
|
|
getPhotonFlux(&p, irrad); |
862 |
greg |
2.1 |
} |
863 |
|
|
|
864 |
|
|
|
865 |
|
|
|
866 |
|
|
void volumePhotonDensity (PhotonMap *pmap, RAY *ray, COLOR irrad) |
867 |
|
|
/* Photon volume density estimate. Returns irradiance at ray -> rop. */ |
868 |
|
|
{ |
869 |
rschregle |
2.11 |
unsigned i; |
870 |
|
|
float r, gecc2, ph; |
871 |
|
|
COLOR flux; |
872 |
|
|
Photon *photon; |
873 |
|
|
const PhotonSearchQueueNode *sqn; |
874 |
greg |
2.1 |
|
875 |
|
|
setcolor(irrad, 0, 0, 0); |
876 |
|
|
|
877 |
|
|
if (!pmap -> maxGather) |
878 |
|
|
return; |
879 |
|
|
|
880 |
|
|
findPhotons(pmap, ray); |
881 |
|
|
|
882 |
|
|
/* Need at least 2 photons */ |
883 |
rschregle |
2.11 |
if (pmap -> squeue.tail < 2) |
884 |
greg |
2.1 |
return; |
885 |
rschregle |
2.11 |
|
886 |
|
|
#if 0 |
887 |
|
|
/* Volume biascomp disabled (probably redundant) */ |
888 |
|
|
if (pmap -> minGather == pmap -> maxGather) |
889 |
|
|
#endif |
890 |
|
|
{ |
891 |
greg |
2.1 |
/* No bias compensation. Just do a plain vanilla estimate */ |
892 |
|
|
gecc2 = ray -> gecc * ray -> gecc; |
893 |
rschregle |
2.11 |
sqn = pmap -> squeue.node + 1; |
894 |
greg |
2.1 |
|
895 |
|
|
/* Average radius between furthest two photons to improve accuracy */ |
896 |
rschregle |
2.11 |
r = max(sqn -> dist2, (sqn + 1) -> dist2); |
897 |
|
|
r = 0.25 * (pmap -> maxDist2 + r + 2 * sqrt(pmap -> maxDist2 * r)); |
898 |
greg |
2.1 |
|
899 |
|
|
/* Skip the extra photon */ |
900 |
rschregle |
2.11 |
for (i = 1; i < pmap -> squeue.tail; i++, sqn++) { |
901 |
|
|
photon = getNearestPhoton(&pmap -> squeue, sqn -> idx); |
902 |
|
|
|
903 |
greg |
2.1 |
/* Compute phase function for inscattering from photon */ |
904 |
|
|
if (gecc2 <= FTINY) |
905 |
|
|
ph = 1; |
906 |
|
|
else { |
907 |
rschregle |
2.11 |
ph = DOT(ray -> rdir, photon -> norm) / 127; |
908 |
greg |
2.1 |
ph = 1 + gecc2 - 2 * ray -> gecc * ph; |
909 |
|
|
ph = (1 - gecc2) / (ph * sqrt(ph)); |
910 |
|
|
} |
911 |
|
|
|
912 |
rschregle |
2.11 |
getPhotonFlux(photon, flux); |
913 |
greg |
2.1 |
scalecolor(flux, ph); |
914 |
|
|
addcolor(irrad, flux); |
915 |
|
|
} |
916 |
|
|
|
917 |
|
|
/* Divide by search volume 4 / 3 * PI * r^3 and phase function |
918 |
|
|
normalization factor 1 / (4 * PI) */ |
919 |
|
|
scalecolor(irrad, 3 / (16 * PI * PI * r * sqrt(r))); |
920 |
|
|
return; |
921 |
|
|
} |
922 |
rschregle |
2.11 |
#if 0 |
923 |
greg |
2.1 |
else |
924 |
|
|
/* Apply bias compensation to density estimate */ |
925 |
|
|
volumeBiasComp(pmap, ray, irrad); |
926 |
rschregle |
2.11 |
#endif |
927 |
greg |
2.1 |
} |