9 |
|
* in the surface plane pointed to the right as seen from the front. |
10 |
|
* This means the Y-axis is "up" and the Z-axis is the surface normal. |
11 |
|
* |
12 |
< |
* BSDF vectors always oriented away from surface, even when "incident." |
12 |
> |
* Note that we reverse the identification of "front" and "back" from |
13 |
> |
* the conventions used in WINDOW 6. "Front" in our library points |
14 |
> |
* in the +Z direction, towards the interior of the space rather |
15 |
> |
* than the exterior. |
16 |
|
* |
17 |
+ |
* BSDF incident & exiting vectors are always oriented away from surface. |
18 |
+ |
* |
19 |
|
* Created by Greg Ward on 1/10/11. |
20 |
|
* |
21 |
|
*/ |
33 |
|
#define SDnameLn 128 /* maximum BSDF name length */ |
34 |
|
#define SDmaxCh 3 /* maximum # spectral channels */ |
35 |
|
|
36 |
< |
/* Component flags for SDsampBSDF() and SDhemiScatter() */ |
36 |
> |
/* Component flags for SDsampBSDF() and SDdirectHemi() */ |
37 |
|
#define SDsampR 0x1 /* include reflection */ |
38 |
|
#define SDsampT 0x2 /* include transmission */ |
39 |
|
#define SDsampS 0x3 /* include scattering (R+T) */ |
44 |
|
#define SDsampSpS 0x7 /* include non-diffuse scattering */ |
45 |
|
#define SDsampAll 0xF /* include everything */ |
46 |
|
|
47 |
< |
/* Projected solid angle query flags fos SDsizeBSDF() */ |
47 |
> |
/* Projected solid angle query flags for SDsizeBSDF() */ |
48 |
|
#define SDqueryVal 0x0 /* query single value */ |
49 |
|
#define SDqueryMin 0x1 /* query minimum proj. solid angle */ |
50 |
|
#define SDqueryMax 0x2 /* query maximum proj. solid angle */ |
81 |
|
typedef const struct { |
82 |
|
/* return non-diffuse BSDF */ |
83 |
|
int (*getBSDFs)(float coef[SDmaxCh], const FVECT outVec, |
84 |
< |
const FVECT inVec, const void *dist); |
84 |
> |
const FVECT inVec, SDComponent *sdc); |
85 |
|
/* query non-diffuse PSA for vector */ |
86 |
< |
SDError (*queryProjSA)(double *psa, const FVECT vec, |
87 |
< |
int qflags, const void *dist); |
86 |
> |
SDError (*queryProjSA)(double *psa, const FVECT v1, |
87 |
> |
const RREAL *v2, int qflags, |
88 |
> |
SDComponent *sdc); |
89 |
|
/* get cumulative distribution */ |
90 |
|
const SDCDst *(*getCDist)(const FVECT inVec, SDComponent *sdc); |
91 |
|
/* sample cumulative distribution */ |
92 |
< |
SDError (*sampCDist)(FVECT outVec, double randX, |
92 |
> |
SDError (*sampCDist)(FVECT ioVec, double randX, |
93 |
|
const SDCDst *cdp); |
94 |
|
/* free a spectral BSDF component */ |
95 |
|
void (*freeSC)(void *dist); |
113 |
|
|
114 |
|
/* Loaded BSDF data */ |
115 |
|
typedef struct { |
116 |
< |
char name[SDnameLn]; /* BSDF name (derived from file) */ |
116 |
> |
char name[SDnameLn]; /* BSDF name (usu. derived from file) */ |
117 |
|
char *mgf; /* geometric description (if any) */ |
118 |
|
float dim[3]; /* width, height, thickness (meters) */ |
119 |
|
SDValue rLambFront; /* diffuse front reflectance */ |
130 |
|
*next; |
131 |
|
} *SDcacheList; /* Global BSDF cache */ |
132 |
|
|
133 |
< |
/* BSDF cache retention preference */ |
134 |
< |
#define SDretainNone 0 /* free unreferenced data (default) */ |
135 |
< |
#define SDretainBSDFs 1 /* keep loaded BSDFs in cache */ |
133 |
> |
/* BSDF cache retention policies */ |
134 |
> |
#define SDretainNone 0 /* free unreferenced BSDF data */ |
135 |
> |
#define SDretainBSDFs 1 /* keep loaded BSDFs in memory */ |
136 |
|
#define SDretainAll 2 /* also keep cumulative cache data */ |
137 |
|
|
138 |
< |
extern int SDretainSet; /* set to SDretainNone by default */ |
138 |
> |
extern int SDretainSet; /* =SDretainNone by default */ |
139 |
|
|
140 |
|
/***************************************************************** |
141 |
|
* The following routines are less commonly used by applications. |
155 |
|
/* Free a spectral distribution function */ |
156 |
|
extern void SDfreeSpectralDF(SDSpectralDF *df); |
157 |
|
|
158 |
< |
/* Initialize an unused BSDF struct (clears to zeroes) */ |
159 |
< |
extern void SDclearBSDF(SDData *sd); |
158 |
> |
/* Initialize an unused BSDF struct and assign name (calls SDclipName) */ |
159 |
> |
extern void SDclearBSDF(SDData *sd, const char *fname); |
160 |
|
|
161 |
|
/* Load a BSDF struct from the given file (keeps name unchanged) */ |
162 |
|
extern SDError SDloadFile(SDData *sd, const char *fname); |
171 |
|
extern void SDfreeCumulativeCache(SDSpectralDF *df); |
172 |
|
|
173 |
|
/* Sample an individual BSDF component */ |
174 |
< |
extern SDError SDsampComponent(SDValue *sv, FVECT outVec, |
175 |
< |
const FVECT inVec, double randX, |
170 |
< |
SDComponent *sdc); |
174 |
> |
extern SDError SDsampComponent(SDValue *sv, FVECT ioVec, |
175 |
> |
double randX, SDComponent *sdc); |
176 |
|
|
177 |
|
/* Convert 1-dimensional random variable to N-dimensional */ |
178 |
|
extern void SDmultiSamp(double t[], int n, double randX); |
189 |
|
*/ |
190 |
|
|
191 |
|
/* Get BSDF from cache (or load and cache it on first call) */ |
192 |
< |
/* Report any problems to stderr and return NULL on failure */ |
192 |
> |
/* Report any problems to stderr (in English), return NULL on failure */ |
193 |
|
extern const SDData *SDcacheFile(const char *fname); |
194 |
|
|
195 |
< |
/* Free a BSDF from our cache (clear all if NULL) */ |
195 |
> |
/* Free a BSDF from our cache (clear all if sd==NULL) */ |
196 |
|
extern void SDfreeCache(const SDData *sd); |
197 |
|
|
198 |
< |
/* Query projected solid angle resolution for non-diffuse BSDF direction */ |
199 |
< |
extern SDError SDsizeBSDF(double *projSA, const FVECT vec, |
200 |
< |
int qflags, const SDData *sd); |
198 |
> |
/* Query projected solid angle resolution for non-diffuse BSDF direction(s) */ |
199 |
> |
extern SDError SDsizeBSDF(double *projSA, const FVECT v1, |
200 |
> |
const RREAL *v2, int qflags, |
201 |
> |
const SDData *sd); |
202 |
|
|
203 |
|
/* Return BSDF for the given incident and scattered ray vectors */ |
204 |
|
extern SDError SDevalBSDF(SDValue *sv, const FVECT outVec, |
209 |
|
int sflags, const SDData *sd); |
210 |
|
|
211 |
|
/* Sample BSDF direction based on the given random variable */ |
212 |
< |
extern SDError SDsampBSDF(SDValue *sv, FVECT outVec, |
207 |
< |
const FVECT inVec, double randX, |
212 |
> |
extern SDError SDsampBSDF(SDValue *sv, FVECT ioVec, double randX, |
213 |
|
int sflags, const SDData *sd); |
214 |
|
|
215 |
|
/***************************************************************** |
217 |
|
* Directions may be passed unnormalized to these routines. |
218 |
|
*/ |
219 |
|
|
220 |
< |
/* Compute World->BSDF transform from surface normal and up (Y) vector */ |
220 |
> |
/* Compute World->BSDF transform from surface normal and BSDF up vector */ |
221 |
|
extern SDError SDcompXform(RREAL vMtx[3][3], const FVECT sNrm, |
222 |
|
const FVECT uVec); |
223 |
|
|
228 |
|
extern SDError SDmapDir(FVECT resVec, RREAL vMtx[3][3], |
229 |
|
const FVECT inpVec); |
230 |
|
|
231 |
< |
/* System-specific BSDF loading routine (not part of our library) */ |
231 |
> |
/* Application-specific BSDF loading routine (not part of our library) */ |
232 |
|
extern SDData *loadBSDF(char *name); |
233 |
|
|
234 |
< |
/* System-specific BSDF error translator (not part of our library) */ |
234 |
> |
/* Application-specific BSDF error translator (not part of our library) */ |
235 |
|
extern char *transSDError(SDError ec); |
236 |
|
|
237 |
|
/*################################################################*/ |