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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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====================================================================== |
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Photon map support routines for emission from light sources |
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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 (DFG) |
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under the FARESYS project. |
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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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|
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$Id$ |
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supported by the Swiss National Science Foundation (SNSF #147053). |
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(c) Tokyo University of Science, |
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supported by the JSPS KAKENHI Grant Number JP19KK0115. |
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====================================================================== |
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|
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$Id$" |
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*/ |
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#include "pmap.h" |
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#include "pmaprand.h" |
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#include "otypes.h" |
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#include "otspecial.h" |
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SRCREC *photonPorts = NULL; /* Photon port list */ |
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/* List of photon port modifier names */ |
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char *photonPortList [MAXSET + 1] = {NULL}; |
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/* Photon port objects (with modifiers in photonPortMods) */ |
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SRCREC *photonPorts = NULL; |
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unsigned numPhotonPorts = 0; |
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|
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void (*photonPartition [NUMOTYPE]) (EmissionMap*); |
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void (*photonOrigin [NUMOTYPE]) (EmissionMap*); |
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|
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extern OBJECT ambset []; |
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|
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/* PHOTON PORT SUPPORT ROUTINES ------------------------------------------ */ |
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|
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/* Get/set photon port orientation flags from/in source flags. |
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* HACK: the port orientation flags are embedded in the source flags and |
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* shifted so they won't clobber the latter, since these are interpreted |
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* by the *PhotonPartition() and *PhotonOrigin() routines! */ |
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#define PMAP_SETPORTFLAGS(portdir) ((int)(portdir) << 14) |
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#define PMAP_GETPORTFLAGS(sflags) ((sflags) >> 14) |
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|
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/* Set number of source partitions. |
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* HACK: this is doubled if the source acts as a bidirectionally |
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* emitting photon port, resulting in alternating front/backside partitions, |
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* although essentially each partition is just used twice with opposing |
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* normals. */ |
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#define PMAP_SETNUMPARTITIONS(emap) ( \ |
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(emap) -> numPartitions <<= ( \ |
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(emap) -> port && \ |
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PMAP_GETPORTFLAGS((emap) -> port -> sflags) == PMAP_PORTBI \ |
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) \ |
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) |
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|
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/* Get current source partition and numer of partitions |
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* HACK: halve the number partitions if the source acts as a bidrectionally |
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* emitting photon port, since each partition is used twice with opposing |
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* normals. */ |
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#define PMAP_GETNUMPARTITIONS(emap) (\ |
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(emap) -> numPartitions >> ( \ |
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(emap) -> port && \ |
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PMAP_GETPORTFLAGS((emap) -> port -> sflags) == PMAP_PORTBI \ |
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) \ |
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) |
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#define PMAP_GETPARTITION(emap) ( \ |
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(emap) -> partitionCnt >> ( \ |
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(emap) -> port && \ |
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PMAP_GETPORTFLAGS((emap) -> port -> sflags) == PMAP_PORTBI \ |
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) \ |
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) |
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|
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|
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|
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void getPhotonPorts (char **portList) |
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/* Find geometry declared as photon ports from modifiers in portList */ |
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{ |
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OBJECT i; |
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OBJREC *obj, *mat; |
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int mLen; |
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char **lp; |
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/* Init photon port objects */ |
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photonPorts = NULL; |
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|
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if (!portList [0]) |
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return; |
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|
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for (i = numPhotonPorts = 0; i < nobjects; i++) { |
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obj = objptr(i); |
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mat = findmaterial(obj); |
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|
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/* Check if object is a surface and NOT a light source (duh) and |
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* resolve its material (if any) via any aliases, then check for |
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* inclusion in modifier list; note use of strncmp() to ignore port |
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* flags */ |
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if (issurface(obj -> otype) && mat && !islight(mat -> otype)) { |
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mLen = strlen(mat -> oname); |
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for (lp = portList; *lp && strncmp(mat -> oname, *lp, mLen); lp++); |
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|
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if (*lp) { |
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/* Add photon port */ |
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photonPorts = (SRCREC*)realloc( |
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photonPorts, (numPhotonPorts + 1) * sizeof(SRCREC) |
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); |
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if (!photonPorts) |
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error(USER, "can't allocate photon ports"); |
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|
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photonPorts [numPhotonPorts].so = obj; |
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/* Extract port orientation flags and embed in source flags. |
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* Note setsource() combines (i.e. ORs) these with the actual |
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* source flags below. */ |
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photonPorts [numPhotonPorts].sflags = |
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PMAP_SETPORTFLAGS((*lp) [mLen]); |
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|
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if (!sfun [obj -> otype].of || !sfun[obj -> otype].of -> setsrc) |
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objerror(obj, USER, "illegal photon port"); |
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|
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setsource(photonPorts + numPhotonPorts, obj); |
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numPhotonPorts++; |
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} |
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} |
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} |
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if (!numPhotonPorts) |
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error(USER, "no valid photon ports found"); |
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} |
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|
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static int flatPhotonPartition2 (EmissionMap* emap, unsigned long mp, |
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FVECT cent, FVECT u, FVECT v, |
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double du2, double dv2) |
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|
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|
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static void setPhotonPortNormal (EmissionMap* emap) |
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/* Set normal for current photon port partition based on its orientation */ |
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{ |
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/* Extract photon port orientation flags, set surface normal as follows: |
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-- Port oriented forwards --> flip surface normal to point |
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outwards, since normal points inwards per mkillum convention) |
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-- Port oriented backwards --> surface normal is NOT flipped, |
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since it already points inwards. |
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-- Port is bidirectionally/bilaterally oriented --> flip normal based |
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on the parity of the current partition emap -> partitionCnt. |
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In this case, photon emission alternates between port front/back |
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faces for consecutive partitions. |
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*/ |
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int i, portFlags = PMAP_GETPORTFLAGS(emap -> port -> sflags); |
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|
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if ( |
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portFlags == PMAP_PORTFWD || |
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portFlags == PMAP_PORTBI && !(emap -> partitionCnt & 1) |
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) |
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for (i = 0; i < 3; i++) |
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emap -> ws [i] = -emap -> ws [i]; |
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} |
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|
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|
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|
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/* SOURCE / PHOTON PORT PARTITIONING ROUTINES----------------------------- */ |
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|
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static int flatPhotonPartition2 ( |
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EmissionMap* emap, unsigned long mp, FVECT cent, FVECT u, FVECT v, |
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double du2, double dv2 |
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) |
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/* Recursive part of flatPhotonPartition(..) */ |
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{ |
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FVECT newct, newax; |
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if (mp > emap -> maxPartitions) { |
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/* Enlarge partition array */ |
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emap -> maxPartitions <<= 1; |
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emap -> partitions = (unsigned char*)realloc(emap -> partitions, |
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< |
emap -> maxPartitions >> 1); |
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> |
emap -> partitions = (unsigned char*)realloc( |
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> |
emap -> partitions, emap -> maxPartitions >> 1 |
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); |
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if (!emap -> partitions) |
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error(USER, "can't allocate source partitions"); |
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memset(emap -> partitions + (emap -> maxPartitions >> 2), 0, |
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< |
emap -> maxPartitions >> 2); |
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memset( |
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emap -> partitions + (emap -> maxPartitions >> 2), 0, |
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emap -> maxPartitions >> 2 |
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); |
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} |
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if (du2 * dv2 <= 1) { /* hit limit? */ |
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vp = emap -> src -> ss [SV]; |
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dv2 = DOT(vp, vp) / emap -> partArea; |
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emap -> partitionCnt = 0; |
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emap -> numPartitions = flatPhotonPartition2(emap, 1, emap -> src -> sloc, |
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< |
emap -> src -> ss [SU], |
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emap -> src -> ss [SV], |
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du2, dv2); |
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> |
emap -> numPartitions = flatPhotonPartition2( |
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emap, 1, emap -> src -> sloc, |
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emap -> src -> ss [SU], emap -> src -> ss [SV], du2, dv2 |
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); |
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emap -> partitionCnt = 0; |
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emap -> partArea = emap -> src -> ss2 / emap -> numPartitions; |
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} |
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distant source */ |
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{ |
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if (emap -> port) { |
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/* Partition photon port */ |
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> |
/* Relay partitioning to photon port */ |
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SRCREC *src = emap -> src; |
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emap -> src = emap -> port; |
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photonPartition [emap -> src -> so -> otype] (emap); |
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PMAP_SETNUMPARTITIONS(emap); |
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emap -> src = src; |
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} |
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else { |
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/* No photon ports defined, so partition scene cube faces */ |
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/* No photon ports defined; partition scene cube faces (SUBOPTIMAL) */ |
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memset(emap -> partitions, 0, emap -> maxPartitions >> 1); |
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setpart(emap -> partitions, 0, S0); |
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emap -> partitionCnt = 0; |
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memset(emap -> partitions, 0, emap -> maxPartitions >> 1); |
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setpart(emap -> partitions, 0, S0); |
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emap -> partArea = 4 * PI * sqr(emap -> src -> srad); |
| 297 |
< |
emap -> numPartitions = emap -> partArea / |
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< |
sqr(srcsizerat * thescene.cusize); |
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> |
emap -> numPartitions = |
| 298 |
> |
emap -> partArea / sqr(srcsizerat * thescene.cusize); |
| 299 |
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|
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numTheta = max(sqrt(2 * emap -> numPartitions / PI) + 0.5, 1); |
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numPhi = 0.5 * PI * numTheta + 0.5; |
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|
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< |
static int cylPhotonPartition2 (EmissionMap* emap, unsigned long mp, |
| 311 |
< |
FVECT cent, FVECT axis, double d2) |
| 310 |
> |
static int cylPhotonPartition2 ( |
| 311 |
> |
EmissionMap* emap, unsigned long mp, FVECT cent, FVECT axis, double d2 |
| 312 |
> |
) |
| 313 |
|
/* Recursive part of cyPhotonPartition(..) */ |
| 314 |
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{ |
| 315 |
|
FVECT newct, newax; |
| 318 |
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if (mp > emap -> maxPartitions) { |
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/* Enlarge partition array */ |
| 320 |
|
emap -> maxPartitions <<= 1; |
| 321 |
< |
emap -> partitions = (unsigned char*)realloc(emap -> partitions, |
| 322 |
< |
emap -> maxPartitions >> 1); |
| 321 |
> |
emap -> partitions = (unsigned char*)realloc( |
| 322 |
> |
emap -> partitions, emap -> maxPartitions >> 1 |
| 323 |
> |
); |
| 324 |
|
if (!emap -> partitions) |
| 325 |
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error(USER, "can't allocate source partitions"); |
| 326 |
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|
| 327 |
< |
memset(emap -> partitions + (emap -> maxPartitions >> 2), 0, |
| 328 |
< |
emap -> maxPartitions >> 2); |
| 327 |
> |
memset( |
| 328 |
> |
emap -> partitions + (emap -> maxPartitions >> 2), 0, |
| 329 |
> |
emap -> maxPartitions >> 2 |
| 330 |
> |
); |
| 331 |
|
} |
| 332 |
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|
| 333 |
|
if (d2 <= 1) { |
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d2 *= d2 * DOT(emap -> src -> ss [SU], emap -> src -> ss [SU]); |
| 375 |
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|
| 376 |
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emap -> partitionCnt = 0; |
| 377 |
< |
emap -> numPartitions = cylPhotonPartition2(emap, 1, emap -> src -> sloc, |
| 378 |
< |
emap -> src -> ss [SU], d2); |
| 377 |
> |
emap -> numPartitions = cylPhotonPartition2( |
| 378 |
> |
emap, 1, emap -> src -> sloc, emap -> src -> ss [SU], d2 |
| 379 |
> |
); |
| 380 |
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emap -> partitionCnt = 0; |
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|
emap -> partArea = PI * emap -> src -> ss2 / emap -> numPartitions; |
| 382 |
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} |
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|
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+ |
/* PHOTON ORIGIN ROUTINES ------------------------------------------------ */ |
| 387 |
+ |
|
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+ |
|
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|
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static void flatPhotonOrigin (EmissionMap* emap) |
| 391 |
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/* Init emission map with photon origin and associated surface axes on |
| 392 |
|
flat light source surface. Also sets source aperture and sampling |
| 398 |
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cent [0] = cent [1] = cent [2] = 0; |
| 399 |
|
size [0] = size [1] = size [2] = emap -> maxPartitions; |
| 400 |
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parr [0] = 0; |
| 401 |
< |
parr [1] = emap -> partitionCnt; |
| 401 |
> |
parr [1] = PMAP_GETPARTITION(emap); |
| 402 |
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|
| 403 |
|
if (!skipparts(cent, size, parr, emap -> partitions)) |
| 404 |
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error(CONSISTENCY, "bad source partition in flatPhotonOrigin"); |
| 414 |
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|
| 415 |
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/* Get origin */ |
| 416 |
|
for (i = 0; i < 3; i++) |
| 417 |
< |
emap -> photonOrg [i] = emap -> src -> sloc [i] + |
| 418 |
< |
vpos [SU] * emap -> src -> ss [SU][i] + |
| 419 |
< |
vpos [SV] * emap -> src -> ss [SV][i] + |
| 420 |
< |
vpos [SW] * emap -> src -> ss [SW][i]; |
| 417 |
> |
emap -> photonOrg [i] = |
| 418 |
> |
emap -> src -> sloc [i] + |
| 419 |
> |
vpos [SU] * emap -> src -> ss [SU][i] + |
| 420 |
> |
vpos [SV] * emap -> src -> ss [SV][i] + |
| 421 |
> |
vpos [SW] * emap -> src -> ss [SW][i]; |
| 422 |
|
|
| 423 |
|
/* Get surface axes */ |
| 424 |
|
VCOPY(emap -> us, emap -> src -> ss [SU]); |
| 425 |
|
normalize(emap -> us); |
| 426 |
|
VCOPY(emap -> ws, emap -> src -> ss [SW]); |
| 427 |
< |
|
| 428 |
< |
if (emap -> port) |
| 279 |
< |
/* Acts as a photon port; reverse normal as it points INSIDE per |
| 280 |
< |
* mkillum convention */ |
| 281 |
< |
for (i = 0; i < 3; i++) |
| 282 |
< |
emap -> ws [i] = -emap -> ws [i]; |
| 283 |
< |
|
| 427 |
> |
/* Flip normal emap -> ws if port and required by its orientation */ |
| 428 |
> |
setPhotonPortNormal(emap); |
| 429 |
|
fcross(emap -> vs, emap -> ws, emap -> us); |
| 430 |
|
|
| 431 |
|
/* Get hemisphere axes & aperture */ |
| 463 |
|
RREAL cosTheta, sinTheta, phi; |
| 464 |
|
|
| 465 |
|
/* Get current partition */ |
| 466 |
< |
numTheta = max(sqrt(2 * emap -> numPartitions / PI) + 0.5, 1); |
| 466 |
> |
numTheta = max(sqrt(2 * PMAP_GETNUMPARTITIONS(emap) / PI) + 0.5, 1); |
| 467 |
|
numPhi = 0.5 * PI * numTheta + 0.5; |
| 468 |
|
|
| 469 |
< |
t = emap -> partitionCnt / numPhi; |
| 470 |
< |
p = emap -> partitionCnt - t * numPhi; |
| 469 |
> |
t = PMAP_GETPARTITION(emap) / numPhi; |
| 470 |
> |
p = PMAP_GETPARTITION(emap) - t * numPhi; |
| 471 |
|
|
| 472 |
|
emap -> ws [2] = cosTheta = 1 - 2 * (t + pmapRandom(partState)) / numTheta; |
| 473 |
|
sinTheta = sqrt(1 - sqr(cosTheta)); |
| 474 |
|
phi = 2 * PI * (p + pmapRandom(partState)) / numPhi; |
| 475 |
|
emap -> ws [0] = cos(phi) * sinTheta; |
| 476 |
|
emap -> ws [1] = sin(phi) * sinTheta; |
| 477 |
+ |
/* Flip normal emap -> ws if port and required by its orientation */ |
| 478 |
+ |
setPhotonPortNormal(emap); |
| 479 |
|
|
| 333 |
– |
if (emap -> port) |
| 334 |
– |
/* Acts as a photon port; reverse normal as it points INSIDE per |
| 335 |
– |
* mkillum convention */ |
| 336 |
– |
for (i = 0; i < 3; i++) |
| 337 |
– |
emap -> ws [i] = -emap -> ws [i]; |
| 338 |
– |
|
| 480 |
|
/* Get surface axes us & vs perpendicular to ws */ |
| 481 |
|
do { |
| 482 |
|
emap -> vs [0] = emap -> vs [1] = emap -> vs [2] = 0; |
| 526 |
|
RREAL du, dv; |
| 527 |
|
|
| 528 |
|
if (emap -> port) { |
| 529 |
< |
/* Get origin on photon port */ |
| 529 |
> |
/* Relay to photon port; get origin on its surface */ |
| 530 |
|
SRCREC *src = emap -> src; |
| 531 |
|
emap -> src = emap -> port; |
| 532 |
|
photonOrigin [emap -> src -> so -> otype] (emap); |
| 534 |
|
} |
| 535 |
|
|
| 536 |
|
else { |
| 537 |
< |
/* No ports defined, so get origin on scene cube face and SUFFA! */ |
| 537 |
> |
/* No ports defined, so get origin on scene cube face (SUBOPTIMAL) */ |
| 538 |
|
/* Get current face from partition number */ |
| 539 |
|
partsPerDim = 1 / srcsizerat; |
| 540 |
|
partsPerFace = sqr(partsPerDim); |
| 541 |
|
face = emap -> partitionCnt / partsPerFace; |
| 401 |
– |
|
| 542 |
|
if (!(emap -> partitionCnt % partsPerFace)) { |
| 543 |
|
/* Skipped to a new face; get its normal */ |
| 544 |
|
emap -> ws [0] = emap -> ws [1] = emap -> ws [2] = 0; |
| 559 |
|
|
| 560 |
|
/* Jittered destination point within partition */ |
| 561 |
|
for (i = 0; i < 3; i++) |
| 562 |
< |
emap -> photonOrg [i] = thescene.cuorg [i] + |
| 563 |
< |
thescene.cusize * (0.5 + du * emap -> us [i] + |
| 564 |
< |
dv * emap -> vs [i] + |
| 565 |
< |
0.5 * emap -> ws [i]); |
| 562 |
> |
emap -> photonOrg [i] = thescene.cuorg [i] + thescene.cusize * ( |
| 563 |
> |
0.5 + du * emap -> us [i] + dv * emap -> vs [i] + |
| 564 |
> |
0.5 * emap -> ws [i] |
| 565 |
> |
); |
| 566 |
|
} |
| 567 |
|
|
| 568 |
|
/* Get hemisphere axes & aperture */ |
| 595 |
|
cent [0] = cent [1] = cent [2] = 0; |
| 596 |
|
size [0] = size [1] = size [2] = emap -> maxPartitions; |
| 597 |
|
parr [0] = 0; |
| 598 |
< |
parr [1] = emap -> partitionCnt; |
| 598 |
> |
parr [1] = PMAP_GETPARTITION(emap); |
| 599 |
|
|
| 600 |
|
if (!skipparts(cent, size, parr, emap -> partitions)) |
| 601 |
|
error(CONSISTENCY, "bad source partition in cylPhotonOrigin"); |
| 614 |
|
|
| 615 |
|
/* Get surface axes */ |
| 616 |
|
for (i = 0; i < 3; i++) |
| 617 |
< |
emap -> photonOrg [i] = emap -> ws [i] = |
| 618 |
< |
(v [SV] * emap -> src -> ss [SV][i] + |
| 619 |
< |
v [SW] * emap -> src -> ss [SW][i]) / 0.8559; |
| 617 |
> |
emap -> photonOrg [i] = emap -> ws [i] = ( |
| 618 |
> |
v [SV] * emap -> src -> ss [SV][i] + |
| 619 |
> |
v [SW] * emap -> src -> ss [SW][i] |
| 620 |
> |
) / 0.8559; |
| 621 |
|
|
| 622 |
< |
if (emap -> port) |
| 623 |
< |
/* Acts as a photon port; reverse normal as it points INSIDE per |
| 483 |
< |
* mkillum convention */ |
| 484 |
< |
for (i = 0; i < 3; i++) |
| 485 |
< |
emap -> ws [i] = -emap -> ws [i]; |
| 622 |
> |
/* Flip normal emap -> ws if port and required by its orientation */ |
| 623 |
> |
setPhotonPortNormal(emap); |
| 624 |
|
|
| 625 |
|
normalize(emap -> ws); |
| 626 |
|
VCOPY(emap -> us, emap -> src -> ss [SU]); |
| 629 |
|
|
| 630 |
|
/* Get origin */ |
| 631 |
|
for (i = 0; i < 3; i++) |
| 632 |
< |
emap -> photonOrg [i] += v [SU] * emap -> src -> ss [SU][i] + |
| 633 |
< |
emap -> src -> sloc [i]; |
| 632 |
> |
emap -> photonOrg [i] += |
| 633 |
> |
v [SU] * emap -> src -> ss [SU][i] + emap -> src -> sloc [i]; |
| 634 |
|
|
| 635 |
|
/* Get hemisphere axes & aperture */ |
| 636 |
|
if (emap -> src -> sflags & SSPOT) { |
| 657 |
|
|
| 658 |
|
|
| 659 |
|
|
| 660 |
< |
void getPhotonPorts () |
| 523 |
< |
/* Find geometry declared as photon ports */ |
| 524 |
< |
{ |
| 525 |
< |
OBJECT i; |
| 526 |
< |
OBJREC* obj; |
| 527 |
< |
|
| 528 |
< |
/* Check for missing port modifiers */ |
| 529 |
< |
if (!ambset [0]) |
| 530 |
< |
error(USER, "no photon ports found"); |
| 531 |
< |
|
| 532 |
< |
for (i = 0; i < nobjects; i++) { |
| 533 |
< |
obj = objptr(i); |
| 534 |
< |
|
| 535 |
< |
if (inset(ambset, obj -> omod)) { |
| 536 |
< |
/* Add photon port */ |
| 537 |
< |
photonPorts = (SRCREC*)realloc(photonPorts, |
| 538 |
< |
(numPhotonPorts + 1) * |
| 539 |
< |
sizeof(SRCREC)); |
| 540 |
< |
if (!photonPorts) |
| 541 |
< |
error(USER, "can't allocate photon ports"); |
| 542 |
< |
|
| 543 |
< |
photonPorts [numPhotonPorts].so = obj; |
| 544 |
< |
photonPorts [numPhotonPorts].sflags = 0; |
| 545 |
< |
|
| 546 |
< |
if (!sfun [obj -> otype].of || !sfun[obj -> otype].of -> setsrc) |
| 547 |
< |
objerror(obj, USER, "illegal photon port"); |
| 548 |
< |
|
| 549 |
< |
setsource(photonPorts + numPhotonPorts, obj); |
| 550 |
< |
numPhotonPorts++; |
| 551 |
< |
} |
| 552 |
< |
} |
| 553 |
< |
} |
| 660 |
> |
/* PHOTON EMISSION ROUTINES ---------------------------------------------- */ |
| 661 |
|
|
| 662 |
|
|
| 663 |
|
|
| 691 |
|
|
| 692 |
|
|
| 693 |
|
void initPhotonEmission (EmissionMap *emap, float numPdfSamples) |
| 694 |
< |
/* Initialize photon emission from partitioned light source emap -> src; |
| 694 |
> |
/* Initialise photon emission from partitioned light source emap -> src; |
| 695 |
|
* this involves integrating the flux emitted from the current photon |
| 696 |
|
* origin emap -> photonOrg and setting up a PDF to sample the emission |
| 697 |
|
* distribution with numPdfSamples samples */ |
| 700 |
|
double phi, cosTheta, sinTheta, du, dv, dOmega, thetaScale; |
| 701 |
|
EmissionSample* sample; |
| 702 |
|
const OBJREC* mod = findmaterial(emap -> src -> so); |
| 703 |
< |
static RAY r; |
| 597 |
< |
#if 0 |
| 598 |
< |
static double lastCosNorm = FHUGE; |
| 599 |
< |
static SRCREC *lastSrc = NULL, *lastPort = NULL; |
| 600 |
< |
#endif |
| 703 |
> |
static RAY r; |
| 704 |
|
|
| 602 |
– |
setcolor(emap -> partFlux, 0, 0, 0); |
| 603 |
– |
|
| 705 |
|
photonOrigin [emap -> src -> so -> otype] (emap); |
| 706 |
< |
cosTheta = DOT(emap -> ws, emap -> wh); |
| 606 |
< |
|
| 607 |
< |
#if 0 |
| 608 |
< |
if (emap -> src == lastSrc && emap -> port == lastPort && |
| 609 |
< |
(emap -> src -> sflags & SDISTANT || mod -> omod == OVOID) && |
| 610 |
< |
cosTheta == lastCosNorm) |
| 611 |
< |
/* Same source, port, and aperture-normal angle, and source is |
| 612 |
< |
either distant (and thus translationally invariant) or has |
| 613 |
< |
no modifier --> flux unchanged */ |
| 614 |
< |
/* BUG: this optimisation ignores partial occlusion of ports and |
| 615 |
< |
can lead to erroneous "zero emission" bailouts. |
| 616 |
< |
It can also lead to bias with modifiers exhibiting high variance! |
| 617 |
< |
Disabled for now -- RS 12/13 */ |
| 618 |
< |
return; |
| 619 |
< |
|
| 620 |
< |
lastSrc = emap -> src; |
| 621 |
< |
lastPort = emap -> port; |
| 622 |
< |
lastCosNorm = cosTheta; |
| 623 |
< |
#endif |
| 624 |
< |
|
| 625 |
< |
/* Need to recompute flux & PDF */ |
| 706 |
> |
setcolor(emap -> partFlux, 0, 0, 0); |
| 707 |
|
emap -> cdf = 0; |
| 708 |
|
emap -> numSamples = 0; |
| 709 |
+ |
cosTheta = DOT(emap -> ws, emap -> wh); |
| 710 |
|
|
| 711 |
< |
if (cosTheta <= 0 && |
| 712 |
< |
sqrt(1 - sqr(cosTheta)) <= emap -> cosThetaMax + FTINY) |
| 631 |
< |
/* Aperture below surface; no emission from current origin */ |
| 711 |
> |
if (cosTheta <= 0 && sqrt(1-sqr(cosTheta)) <= emap -> cosThetaMax + FTINY) |
| 712 |
> |
/* Aperture completely below surface; no emission from current origin */ |
| 713 |
|
return; |
| 714 |
|
|
| 715 |
< |
if (mod -> omod == OVOID && !emap -> port && |
| 716 |
< |
(cosTheta >= 1 - FTINY || (emap -> src -> sflags & SDISTANT && |
| 717 |
< |
acos(cosTheta) + acos(emap -> cosThetaMax) <= 0.5 * PI))) { |
| 715 |
> |
if ( |
| 716 |
> |
mod -> omod == OVOID && !emap -> port && ( |
| 717 |
> |
cosTheta >= 1 - FTINY || ( |
| 718 |
> |
emap -> src -> sflags & SDISTANT && |
| 719 |
> |
acos(cosTheta) + acos(emap -> cosThetaMax) <= 0.5 * PI |
| 720 |
> |
) |
| 721 |
> |
) |
| 722 |
> |
) { |
| 723 |
|
/* Source is unmodified and has no port (which requires testing for |
| 724 |
|
occlusion), and is either local with normal aligned aperture or |
| 725 |
< |
distant with aperture above surface; analytical flux & PDF */ |
| 726 |
< |
setcolor(emap -> partFlux, mod -> oargs.farg [0], |
| 727 |
< |
mod -> oargs.farg [1], mod -> oargs.farg [2]); |
| 725 |
> |
distant with aperture above surface |
| 726 |
> |
--> get flux & PDF via analytical solution */ |
| 727 |
> |
setcolor( |
| 728 |
> |
emap -> partFlux, mod -> oargs.farg [0], mod -> oargs.farg [1], |
| 729 |
> |
mod -> oargs.farg [2] |
| 730 |
> |
); |
| 731 |
|
|
| 732 |
< |
/* Multiply radiance by Omega * dA to get flux */ |
| 733 |
< |
scalecolor(emap -> partFlux, |
| 734 |
< |
PI * cosTheta * (1 - sqr(max(emap -> cosThetaMax, 0))) * |
| 735 |
< |
emap -> partArea); |
| 732 |
> |
/* Multiply radiance by projected Omega * dA to get flux */ |
| 733 |
> |
scalecolor( |
| 734 |
> |
emap -> partFlux, |
| 735 |
> |
PI * cosTheta * (1 - sqr(max(emap -> cosThetaMax, 0))) * |
| 736 |
> |
emap -> partArea |
| 737 |
> |
); |
| 738 |
|
} |
| 739 |
|
|
| 740 |
|
else { |
| 741 |
|
/* Source is either modified, has a port, is local with off-normal |
| 742 |
< |
aperture, or distant with aperture partly below surface; get flux |
| 743 |
< |
via numerical integration */ |
| 742 |
> |
aperture, or distant with aperture partly below surface |
| 743 |
> |
--> get flux via numerical integration */ |
| 744 |
|
thetaScale = (1 - emap -> cosThetaMax); |
| 745 |
|
|
| 746 |
|
/* Figga out numba of aperture samples for integration; |
| 753 |
|
thetaScale /= emap -> numTheta; |
| 754 |
|
|
| 755 |
|
/* Allocate PDF, baby */ |
| 756 |
< |
sample = emap -> samples = (EmissionSample*) |
| 757 |
< |
realloc(emap -> samples, |
| 758 |
< |
sizeof(EmissionSample) * |
| 759 |
< |
emap -> numTheta * emap -> numPhi); |
| 756 |
> |
sample = emap -> samples = (EmissionSample*)realloc( |
| 757 |
> |
emap -> samples, |
| 758 |
> |
sizeof(EmissionSample) * emap -> numTheta * emap -> numPhi |
| 759 |
> |
); |
| 760 |
|
if (!emap -> samples) |
| 761 |
|
error(USER, "can't allocate emission PDF"); |
| 762 |
|
|
| 763 |
|
VCOPY(r.rorg, emap -> photonOrg); |
| 764 |
|
VCOPY(r.rop, emap -> photonOrg); |
| 765 |
< |
r.rmax = FHUGE; |
| 765 |
> |
r.rmax = 0; |
| 766 |
|
|
| 767 |
|
for (t = 0; t < emap -> numTheta; t++) { |
| 768 |
|
for (p = 0; p < emap -> numPhi; p++) { |
| 775 |
|
rayorigin(&r, PRIMARY, NULL, NULL); |
| 776 |
|
|
| 777 |
|
for (i = 0; i < 3; i++) |
| 778 |
< |
r.rdir [i] = du * emap -> uh [i] + dv * emap -> vh [i] + |
| 779 |
< |
cosTheta * emap -> wh [i]; |
| 778 |
> |
r.rdir [i] = ( |
| 779 |
> |
du * emap -> uh [i] + dv * emap -> vh [i] + |
| 780 |
> |
cosTheta * emap -> wh [i] |
| 781 |
> |
); |
| 782 |
|
|
| 783 |
|
/* Sample behind surface? */ |
| 784 |
|
VCOPY(r.ron, emap -> ws); |
| 797 |
|
continue; |
| 798 |
|
|
| 799 |
|
raytexture(&r, mod -> omod); |
| 800 |
< |
setcolor(r.rcol, mod -> oargs.farg [0], mod -> oargs.farg [1], |
| 801 |
< |
mod -> oargs.farg [2]); |
| 800 |
> |
setcolor( |
| 801 |
> |
r.rcol, mod -> oargs.farg [0], mod -> oargs.farg [1], |
| 802 |
> |
mod -> oargs.farg [2] |
| 803 |
> |
); |
| 804 |
|
multcolor(r.rcol, r.pcol); |
| 805 |
|
|
| 806 |
|
/* Multiply by cos(theta_surface) */ |
| 841 |
|
/* Choose a new origin within current partition for every |
| 842 |
|
emitted photon to break up clustering artifacts */ |
| 843 |
|
photonOrigin [emap -> src -> so -> otype] ((EmissionMap*)emap); |
| 844 |
+ |
/* If we have a local glow source with a maximum radius, then |
| 845 |
+ |
restrict our photon to the specified distance, otherwise we set |
| 846 |
+ |
the limit imposed by photonMaxDist (or no limit if 0) */ |
| 847 |
+ |
if ( |
| 848 |
+ |
mod -> otype == MAT_GLOW && |
| 849 |
+ |
!(emap -> src -> sflags & SDISTANT) && mod -> oargs.farg[3] > FTINY |
| 850 |
+ |
) |
| 851 |
+ |
ray -> rmax = mod -> oargs.farg[3]; |
| 852 |
+ |
else |
| 853 |
+ |
ray -> rmax = photonMaxDist; |
| 854 |
|
rayorigin(ray, PRIMARY, NULL, NULL); |
| 750 |
– |
ray -> rmax = FHUGE; |
| 855 |
|
|
| 856 |
|
if (!emap -> numSamples) { |
| 857 |
|
/* Source is unmodified and has no port, and either local with |
| 858 |
< |
normal aligned aperture, or distant with aperture above surface; |
| 859 |
< |
use cosine weighted distribution */ |
| 860 |
< |
cosThetaSqr = 1 - pmapRandom(emitState) * |
| 861 |
< |
(1 - sqr(max(emap -> cosThetaMax, 0))); |
| 858 |
> |
normal aligned aperture, or distant with aperture above surface |
| 859 |
> |
--> use cosine weighted distribution */ |
| 860 |
> |
cosThetaSqr = (1 - |
| 861 |
> |
pmapRandom(emitState) * (1 - sqr(max(emap -> cosThetaMax, 0))) |
| 862 |
> |
); |
| 863 |
|
cosTheta = sqrt(cosThetaSqr); |
| 864 |
|
sinTheta = sqrt(1 - cosThetaSqr); |
| 865 |
|
phi = 2 * PI * pmapRandom(emitState); |
| 866 |
< |
setcolor(ray -> rcol, mod -> oargs.farg [0], mod -> oargs.farg [1], |
| 867 |
< |
mod -> oargs.farg [2]); |
| 866 |
> |
setcolor( |
| 867 |
> |
ray -> rcol, mod -> oargs.farg [0], mod -> oargs.farg [1], |
| 868 |
> |
mod -> oargs.farg [2] |
| 869 |
> |
); |
| 870 |
|
} |
| 871 |
|
|
| 872 |
|
else { |
| 873 |
|
/* Source is either modified, has a port, is local with off-normal |
| 874 |
< |
aperture, or distant with aperture partly below surface; choose |
| 875 |
< |
direction from constructed cumulative distribution function with |
| 876 |
< |
Monte Carlo inversion using binary search. */ |
| 874 |
> |
aperture, or distant with aperture partly below surface |
| 875 |
> |
--> choose direction from constructed cumulative distribution |
| 876 |
> |
function with Monte Carlo inversion using binary search. */ |
| 877 |
|
du = pmapRandom(emitState) * emap -> cdf; |
| 878 |
|
lo = 1; |
| 879 |
|
hi = emap -> numSamples; |
| 889 |
|
} |
| 890 |
|
|
| 891 |
|
/* This is a uniform mapping, mon */ |
| 892 |
< |
cosTheta = 1 - (sample -> theta + pmapRandom(emitState)) * |
| 893 |
< |
(1 - emap -> cosThetaMax) / emap -> numTheta; |
| 892 |
> |
cosTheta = (1 - |
| 893 |
> |
(sample -> theta + pmapRandom(emitState)) * |
| 894 |
> |
(1 - emap -> cosThetaMax) / emap -> numTheta |
| 895 |
> |
); |
| 896 |
|
sinTheta = sqrt(1 - sqr(cosTheta)); |
| 897 |
|
phi = 2 * PI * (sample -> phi + pmapRandom(emitState)) / emap -> numPhi; |
| 898 |
|
copycolor(ray -> rcol, sample -> pdf); |
| 926 |
|
|
| 927 |
|
|
| 928 |
|
|
| 929 |
+ |
/* SOURCE CONTRIBS FROM DIRECT / VOLUME PHOTONS -------------------------- */ |
| 930 |
+ |
|
| 931 |
+ |
|
| 932 |
+ |
|
| 933 |
|
void multDirectPmap (RAY *r) |
| 934 |
|
/* Factor irradiance from direct photons into r -> rcol; interface to |
| 935 |
|
* direct() */ |
| 953 |
|
/* Add ambient in-scattering via lookup callback */ |
| 954 |
|
(volumePmap -> lookup)(volumePmap, r, inscatter); |
| 955 |
|
} |
| 956 |
+ |
|
