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Comparing ray/src/rt/pmutil.c (file contents):
Revision 2.2 by rschregle, Wed Jan 24 19:39:05 2018 UTC vs.
Revision 2.3 by rschregle, Fri Feb 9 14:57:42 2018 UTC

# Line 109 | Line 109 | void photonDensity (PhotonMap *pmap, RAY *ray, COLOR i
109   /* Photon density estimate. Returns irradiance at ray -> rop. */
110   {
111     unsigned                      i;
112 <   float                         r;
112 >   float                         r2;
113     COLOR                         flux;
114     Photon                        *photon;
115     const PhotonSearchQueueNode   *sqn;
# Line 141 | Line 141 | void photonDensity (PhotonMap *pmap, RAY *ray, COLOR i
141        /* No bias compensation. Just do a plain vanilla estimate */
142        sqn = pmap -> squeue.node + 1;
143        
144 <      /* Average radius between furthest two photons to improve accuracy */      
145 <      r = max(sqn -> dist2, (sqn + 1) -> dist2);
146 <      r = 0.25 * (pmap -> maxDist2 + r + 2 * sqrt(pmap -> maxDist2 * r));  
144 >      /* Average radius^2 between furthest two photons to improve accuracy */
145 >      r2 = max(sqn -> dist2, (sqn + 1) -> dist2);
146 >      r2 = 0.25 * (pmap -> maxDist2 + r2 + 2 * sqrt(pmap -> maxDist2 * r2));
147        
148        /* Skip the extra photon */
149        for (i = 1 ; i < pmap -> squeue.tail; i++, sqn++) {
# Line 151 | Line 151 | void photonDensity (PhotonMap *pmap, RAY *ray, COLOR i
151           getPhotonFlux(photon, flux);        
152   #ifdef PMAP_EPANECHNIKOV
153           /* Apply Epanechnikov kernel to photon flux based on photon dist */
154 <         scalecolor(flux, 2 * (1 - sqn -> dist2 / r));
154 >         scalecolor(flux, 2 * (1 - sqn -> dist2 / r2));
155   #endif  
156           addcolor(irrad, flux);
157        }
158        
159        /* Divide by search area PI * r^2, 1 / PI required as ambient
160           normalisation factor */        
161 <      scalecolor(irrad, 1 / (PI * PI * r));
161 >      scalecolor(irrad, 1 / (PI * PI * r2));
162        
163        return;
164     }
# Line 192 | Line 192 | void volumePhotonDensity (PhotonMap *pmap, RAY *ray, C
192   /* Photon volume density estimate. Returns irradiance at ray -> rop. */
193   {
194     unsigned                      i;
195 <   float                         r, gecc2, ph;
195 >   float                         r2, gecc2, ph;
196     COLOR                         flux;
197     Photon                        *photon;
198     const PhotonSearchQueueNode   *sqn;
# Line 217 | Line 217 | void volumePhotonDensity (PhotonMap *pmap, RAY *ray, C
217        gecc2 = ray -> gecc * ray -> gecc;
218        sqn = pmap -> squeue.node + 1;
219        
220 <      /* Average radius between furthest two photons to improve accuracy */      
221 <      r = max(sqn -> dist2, (sqn + 1) -> dist2);
222 <      r = 0.25 * (pmap -> maxDist2 + r + 2 * sqrt(pmap -> maxDist2 * r));  
220 >      /* Average radius^2 between furthest two photons to improve accuracy */      
221 >      r2 = max(sqn -> dist2, (sqn + 1) -> dist2);
222 >      r2 = 0.25 * (pmap -> maxDist2 + r2 + 2 * sqrt(pmap -> maxDist2 * r2));
223        
224        /* Skip the extra photon */
225        for (i = 1; i < pmap -> squeue.tail; i++, sqn++) {
# Line 241 | Line 241 | void volumePhotonDensity (PhotonMap *pmap, RAY *ray, C
241        
242        /* Divide by search volume 4 / 3 * PI * r^3 and phase function
243           normalization factor 1 / (4 * PI) */
244 <      scalecolor(irrad, 3 / (16 * PI * PI * r * sqrt(r)));
244 >      scalecolor(irrad, 3 / (16 * PI * PI * r2 * sqrt(r2)));
245        return;
246     }
247   #if 0

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