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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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================================================================== |
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Photon map data structures and kd-tree handling |
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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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Lucerne University of Applied Sciences & Arts |
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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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================================================================== |
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– |
$Id$ |
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*/ |
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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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const PhotonPrimary* addPhotonPrimary (PhotonMap *pmap, const RAY *ray) |
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{ |
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PhotonPrimary *prim = NULL; |
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FVECT dvec; |
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if (!pmap || !ray) |
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return NULL; |
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prim -> srcIdx = -1; |
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/* Reverse incident direction to point to light source */ |
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prim -> dir [0] = -ray -> rdir [0]; |
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prim -> dir [1] = -ray -> rdir [1]; |
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prim -> dir [2] = -ray -> rdir [2]; |
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dvec [0] = -ray -> rdir [0]; |
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dvec [1] = -ray -> rdir [1]; |
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dvec [2] = -ray -> rdir [2]; |
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prim -> dir = encodedir(dvec); |
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VCOPY(prim -> org, ray -> rorg); |
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VCOPY(prim -> pos, ray -> rop); |
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return prim; |
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} |
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} |
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/* Reject photon if normal faces away (ignored for volume photons) */ |
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if (norm && DOT(norm, p -> norm) <= 0) |
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if (norm && DOT(norm, p -> norm) <= 0.5 * frandom()) |
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return; |
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if (isContribPmap(pmap) && pmap -> srcContrib) { |
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if (srcIdx < 0 || srcIdx >= nsources) |
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error(INTERNAL, "invalid light source index in photon map"); |
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srcMod = objptr(source [srcIdx].so -> omod); |
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srcMod = findmaterial(source [srcIdx].so); |
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/* Reject photon if contributions from light source which emitted it |
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* are not sought */ |
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/* Threshold below which we assume increasing max radius won't help */ |
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#define PMAP_SHORT_LOOKUP_THRESH 1 |
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/* Coefficient for adaptive maximum search radius */ |
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#define PMAP_MAXDIST_COEFF 100 |
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void findPhotons (PhotonMap* pmap, const RAY* ray) |
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{ |
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float pos [3], norm [3]; |
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pmap -> minError = FHUGE; |
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pmap -> maxError = -FHUGE; |
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pmap -> rmsError = 0; |
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/* Maximum search radius limit based on avg photon distance to |
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* centre of gravity */ |
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/* SQUARED max search radius limit is based on avg photon distance to |
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* centre of gravity, unless fixed by user (maxDistFix > 0) */ |
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pmap -> maxDist0 = pmap -> maxDistLimit = |
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maxDistCoeff * pmap -> squeueSize * pmap -> CoGdist / |
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pmap -> heapSize; |
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maxDistFix > 0 ? maxDistFix * maxDistFix |
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: PMAP_MAXDIST_COEFF * pmap -> squeueSize * |
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pmap -> CoGdist / pmap -> heapSize; |
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} |
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do { |
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VCOPY(norm, ray -> ron); |
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nearestNeighbours(pmap, pos, norm, 1); |
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} |
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#ifdef PMAP_ITSYBITSY |
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if (pmap -> maxDist < FTINY) { |
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sprintf(errmsg, "itsy bitsy teeny weeny photon search radius %e", |
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sqrt(pmap -> maxDist)); |
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error(WARNING, errmsg); |
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} |
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#endif |
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if (pmap -> squeueEnd < pmap -> squeueSize * pmap -> gatherTolerance) { |
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/* Short lookup; too few photons found */ |
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if (pmap -> squeueEnd > PMAP_SHORT_LOOKUP_THRESH) { |
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ray -> ro ? ray -> ro -> oname : "<null>"); |
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error(WARNING, errmsg); |
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#endif |
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/* Bail out after warning if maxDist is fixed */ |
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if (maxDistFix > 0) |
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return; |
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if (pmap -> maxDist0 < pmap -> maxDistLimit) { |
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/* Increase max search radius if below limit & redo search */ |
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pmap -> maxDist0 *= PMAP_MAXDIST_INC; |
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#ifdef PMAP_LOOKUP_REDO |
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redo = 1; |
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#endif |
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#ifdef PMAP_LOOKUP_WARN |
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sprintf(errmsg, |
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redo ? "restarting photon lookup with max radius %.1e" |
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: "max photon lookup radius adjusted to %.1e", |
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pmap -> maxDist0); |
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sqrt(pmap -> maxDist0)); |
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error(WARNING, errmsg); |
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#endif |
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} |
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#ifdef PMAP_LOOKUP_REDO |
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else { |
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sprintf(errmsg, "max photon lookup radius clamped to %.1e", |
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pmap -> maxDist0); |
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sqrt(pmap -> maxDist0)); |
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error(WARNING, errmsg); |
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} |
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#endif |
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} |
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/* Reset successful lookup counter */ |
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pmap -> numLookups = 0; |
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} |
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} |
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else { |
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/* Bail out after warning if maxDist is fixed */ |
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if (maxDistFix > 0) |
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return; |
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/* Increment successful lookup counter and reduce max search radius if |
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* wraparound */ |
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pmap -> numLookups = (pmap -> numLookups + 1) % PMAP_MAXDIST_CNT; |
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redo = 0; |
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} |
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} while (redo); |
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} |
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dv [2] = pos [2] - p -> pos [2]; |
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d2 = DOT(dv, dv); |
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if (d2 < pmap -> maxDist && DOT(norm, p -> norm) > 0) { |
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if (d2 < pmap -> maxDist && DOT(norm, p -> norm) > 0.5 * frandom()) { |
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/* Closest photon so far with similar normal */ |
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pmap -> maxDist = d2; |
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*photon = p; |
