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|
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Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) |
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(c) Fraunhofer Institute for Solar Energy Systems, |
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supported by the German Research Foundation |
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(DFG LU-204/10-2, "Fassadenintegrierte Regelsysteme FARESYS") |
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(c) Lucerne University of Applied Sciences and Arts, |
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supported by the Swiss National Science Foundation (SNSF, #147053) |
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supported by the Swiss National Science Foundation |
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(SNSF #147053, "Daylight Redirecting Components") |
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====================================================================== |
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|
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$Id$ |
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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 "otspecial.h" |
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#include <time.h> |
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#if NIX |
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#include <sys/stat.h> |
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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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RREAL xi1, cosTheta, phi, du, dv; |
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const float cext = colorAvg(ray -> cext), |
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albedo = colorAvg(ray -> albedo), |
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gecc2 = ray -> gecc * ray -> gecc; |
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gecc = ray -> gecc, gecc2 = sqr(gecc); |
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FVECT u, v; |
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COLOR cvext; |
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|
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/* Store volume photons unconditionally in mist to also account for |
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direct inscattering from sources */ |
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if (albedo > FTINY) |
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#endif |
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#endif |
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/* Add to volume photon map */ |
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newPhoton(volumePmap, ray); |
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|
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scalecolor(ray -> rcol, 1 / albedo); |
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|
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/* Scatter photon */ |
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xi1 = pmapRandom(scatterState); |
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cosTheta = ray -> gecc <= FTINY |
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? 2 * pmapRandom(scatterState) - 1 |
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: 0.5 * (1 + gecc2 - |
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(1 - gecc2) / (1 - ray -> gecc + 2 * ray -> gecc * |
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pmapRandom(scatterState))) / ray -> gecc; |
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< |
|
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< |
cosPhi = cos(2 * PI * pmapRandom(scatterState)); |
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du = dv = sqrt(1 - cosTheta * cosTheta); /* sin(theta) */ |
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du *= cosPhi; |
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dv *= sqrt(1 - cosPhi * cosPhi); /* sin(phi) */ |
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? 2 * xi1 - 1 |
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: 0.5 / gecc * |
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(1 + gecc2 - sqr((1 - gecc2) / |
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(1 + gecc * (2 * xi1 - 1)))); |
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|
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phi = 2 * PI * pmapRandom(scatterState); |
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du = dv = sqrt(1 - sqr(cosTheta)); /* sin(theta) */ |
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du *= cos(phi); |
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dv *= sin(phi); |
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|
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/* Get axes u & v perpendicular to photon direction */ |
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i = 0; |
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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]; |
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|
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ray -> rlvl++; |
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ray -> rmax = -log(pmapRandom(mediumState)) / cext; |
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} |
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if (localhit(ray, &thescene)) { |
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mod = ray -> ro -> omod; |
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|
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< |
if (port && ray -> ro != port) { |
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> |
/* XXX: Is port -> omod != mod sufficient here? Probably not... */ |
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if ( |
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> |
port && ray -> ro != port && |
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> |
findmaterial(port) != findmaterial(ray -> ro) |
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) { |
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/* !!! PHOTON PORT REJECTION SAMPLING HACK !!! |
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* Terminate photon if emitted from port without intersecting it; |
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* this can happen when the port's partitions extend beyond its |
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> |
* Terminate photon if emitted from port without intersecting it or |
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> |
* its other associated surfaces or same material. |
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* This can happen when the port's partitions extend beyond its |
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* actual geometry, e.g. with polygons. Since the total flux |
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* relayed by the port is based on the (in this case) larger |
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* partition area, it is overestimated; terminating these photons |
