15 |
|
|
16 |
|
/* Convert a BSDF to our matrix representation */ |
17 |
|
static CMATRIX * |
18 |
< |
cm_bsdf(const COLOR bsdfLamb, const COLOR specCol, const SDMat *bsdf) |
18 |
> |
cm_bsdf(const COLOR diffBSDF, const SDMat *bsdf) |
19 |
|
{ |
20 |
|
CMATRIX *cm = cm_alloc(bsdf->nout, bsdf->ninc); |
21 |
|
int nbadohm = 0; |
28 |
|
nbadohm += (dom <= 0); |
29 |
|
|
30 |
|
for (r = 0; r < cm->nrows; r++) { |
31 |
< |
float f = mBSDF_value(bsdf,c,r); |
31 |
> |
float f = mBSDF_value(bsdf,r,c); |
32 |
|
COLORV *mp = cm_lval(cm,r,c); |
33 |
|
/* check BSDF value */ |
34 |
|
if ((f <= 0) | (dom <= 0)) { |
35 |
|
nneg += (f < -FTINY); |
36 |
< |
f = .0f; |
37 |
< |
} |
38 |
< |
copycolor(mp, specCol); |
39 |
< |
scalecolor(mp, f); |
40 |
< |
addcolor(mp, bsdfLamb); |
36 |
> |
setcolor(mp, .0f, .0f, .0f); |
37 |
> |
} else if (bsdf->chroma != NULL) { |
38 |
> |
C_COLOR cxy; |
39 |
> |
c_decodeChroma(&cxy, mBSDF_chroma(bsdf,r,c)); |
40 |
> |
ccy2rgb(&cxy, f, mp); |
41 |
> |
} else |
42 |
> |
setcolor(mp, f, f, f); |
43 |
> |
addcolor(mp, diffBSDF); |
44 |
|
scalecolor(mp, dom); |
45 |
|
} |
46 |
|
} |
79 |
|
|
80 |
|
/* Convert a BSDF to our matrix representation, applying reciprocity */ |
81 |
|
static CMATRIX * |
82 |
< |
cm_bsdf_recip(const COLOR bsdfLamb, const COLOR specCol, const SDMat *bsdf) |
82 |
> |
cm_bsdf_recip(const COLOR diffBSDF, const SDMat *bsdf) |
83 |
|
{ |
84 |
|
CMATRIX *cm = cm_alloc(bsdf->ninc, bsdf->nout); |
85 |
|
int nbadohm = 0; |
94 |
|
|
95 |
|
for (r = 0; r < cm->nrows; r++) { |
96 |
|
const int ri = recip_in_from_out(bsdf,r); |
97 |
< |
float f = mBSDF_value(bsdf,ri,ro); |
97 |
> |
float f = mBSDF_value(bsdf,ro,ri); |
98 |
|
COLORV *mp = cm_lval(cm,r,c); |
99 |
|
/* check BSDF value */ |
100 |
|
if ((f <= 0) | (dom <= 0)) { |
101 |
|
nneg += (f < -FTINY); |
102 |
< |
f = .0f; |
103 |
< |
} |
104 |
< |
copycolor(mp, specCol); |
105 |
< |
scalecolor(mp, f); |
106 |
< |
addcolor(mp, bsdfLamb); |
102 |
> |
setcolor(mp, .0f, .0f, .0f); |
103 |
> |
} else if (bsdf->chroma != NULL) { |
104 |
> |
C_COLOR cxy; |
105 |
> |
c_decodeChroma(&cxy, mBSDF_chroma(bsdf,ro,ri)); |
106 |
> |
ccy2rgb(&cxy, f, mp); |
107 |
> |
} else |
108 |
> |
setcolor(mp, f, f, f); |
109 |
> |
addcolor(mp, diffBSDF); |
110 |
|
scalecolor(mp, dom); |
111 |
|
} |
112 |
|
} |
119 |
|
return(cm); |
120 |
|
} |
121 |
|
|
122 |
< |
/* Load and convert a matrix BSDF from the given XML file */ |
122 |
> |
/* Return a Lambertian (diffuse) matrix */ |
123 |
> |
static CMATRIX * |
124 |
> |
cm_bsdf_Lamb(const COLOR diffBSDF) |
125 |
> |
{ |
126 |
> |
CMATRIX *cm = cm_alloc(145, 145); /* this is a hack */ |
127 |
> |
ANGLE_BASIS *abase = abase_list; |
128 |
> |
int r, c; |
129 |
> |
|
130 |
> |
while (abase->nangles != cm->nrows) |
131 |
> |
if (++abase >= abase_list+nabases) |
132 |
> |
error(INTERNAL, "Code error in cm_bsdf_Lamb()"); |
133 |
> |
|
134 |
> |
for (c = 0; c < cm->ncols; c++) { |
135 |
> |
const double dom = io_getohm(c,abase); |
136 |
> |
for (r = 0; r < cm->nrows; r++) { |
137 |
> |
COLORV *mp = cm_lval(cm,r,c); |
138 |
> |
copycolor(mp, diffBSDF); |
139 |
> |
scalecolor(mp, dom); |
140 |
> |
} |
141 |
> |
} |
142 |
> |
return(cm); |
143 |
> |
} |
144 |
> |
|
145 |
> |
/* Load and convert a matrix BTDF from the given XML file */ |
146 |
|
CMATRIX * |
147 |
< |
cm_loadBSDF(char *fname, COLOR cLamb) |
147 |
> |
cm_loadBTDF(const char *fname) |
148 |
|
{ |
149 |
|
CMATRIX *Tmat; |
121 |
– |
char *fpath; |
150 |
|
int recip; |
151 |
|
SDError ec; |
152 |
|
SDData myBSDF; |
153 |
|
SDSpectralDF *tdf; |
154 |
< |
COLOR bsdfLamb, specCol; |
155 |
< |
/* find path to BSDF file */ |
128 |
< |
fpath = getpath(fname, getrlibpath(), R_OK); |
129 |
< |
if (fpath == NULL) { |
130 |
< |
sprintf(errmsg, "cannot find BSDF file '%s'", fname); |
131 |
< |
error(USER, errmsg); |
132 |
< |
} |
154 |
> |
COLOR diffBTDF; |
155 |
> |
|
156 |
|
SDclearBSDF(&myBSDF, fname); /* load XML and check type */ |
157 |
< |
ec = SDloadFile(&myBSDF, fpath); |
157 |
> |
ec = SDloadFile(&myBSDF, fname); |
158 |
|
if (ec) |
159 |
|
error(USER, transSDError(ec)); |
160 |
< |
ccy2rgb(&myBSDF.tLamb.spec, myBSDF.tLamb.cieY/PI, bsdfLamb); |
160 |
> |
ccy2rgb(&myBSDF.tLamb.spec, myBSDF.tLamb.cieY/PI, diffBTDF); |
161 |
|
recip = (myBSDF.tb == NULL); |
162 |
|
tdf = recip ? myBSDF.tf : myBSDF.tb; |
163 |
|
if (tdf == NULL) { /* no non-Lambertian transmission? */ |
141 |
– |
if (cLamb != NULL) |
142 |
– |
copycolor(cLamb, bsdfLamb); |
164 |
|
SDfreeBSDF(&myBSDF); |
165 |
< |
return(NULL); |
165 |
> |
return(cm_bsdf_Lamb(diffBTDF)); |
166 |
|
} |
167 |
|
if (tdf->ncomp != 1 || tdf->comp[0].func != &SDhandleMtx) { |
168 |
< |
sprintf(errmsg, "unsupported BSDF '%s'", fpath); |
168 |
> |
sprintf(errmsg, "unsupported BSDF '%s'", fname); |
169 |
|
error(USER, errmsg); |
170 |
|
} |
171 |
|
/* convert BTDF to matrix */ |
172 |
< |
ccy2rgb(&tdf->comp[0].cspec[0], 1., specCol); |
173 |
< |
Tmat = recip ? cm_bsdf_recip(bsdfLamb, specCol, (SDMat *)tdf->comp[0].dist) |
153 |
< |
: cm_bsdf(bsdfLamb, specCol, (SDMat *)tdf->comp[0].dist); |
154 |
< |
if (cLamb != NULL) /* Lambertian is included */ |
155 |
< |
setcolor(cLamb, .0, .0, .0); |
172 |
> |
Tmat = recip ? cm_bsdf_recip(diffBTDF, (SDMat *)tdf->comp[0].dist) |
173 |
> |
: cm_bsdf(diffBTDF, (SDMat *)tdf->comp[0].dist); |
174 |
|
/* free BSDF and return */ |
175 |
|
SDfreeBSDF(&myBSDF); |
176 |
|
return(Tmat); |
177 |
+ |
} |
178 |
+ |
|
179 |
+ |
/* Load and convert a matrix BRDF from the given XML file */ |
180 |
+ |
CMATRIX * |
181 |
+ |
cm_loadBRDF(const char *fname, int backside) |
182 |
+ |
{ |
183 |
+ |
CMATRIX *Rmat; |
184 |
+ |
SDError ec; |
185 |
+ |
SDData myBSDF; |
186 |
+ |
SDSpectralDF *rdf; |
187 |
+ |
COLOR diffBRDF; |
188 |
+ |
|
189 |
+ |
SDclearBSDF(&myBSDF, fname); /* load XML and check type */ |
190 |
+ |
ec = SDloadFile(&myBSDF, fname); |
191 |
+ |
if (ec) |
192 |
+ |
error(USER, transSDError(ec)); |
193 |
+ |
if (backside) { |
194 |
+ |
ccy2rgb(&myBSDF.rLambBack.spec, myBSDF.rLambBack.cieY/PI, diffBRDF); |
195 |
+ |
rdf = myBSDF.rb; |
196 |
+ |
} else { |
197 |
+ |
ccy2rgb(&myBSDF.rLambFront.spec, myBSDF.rLambFront.cieY/PI, diffBRDF); |
198 |
+ |
rdf = myBSDF.rf; |
199 |
+ |
} |
200 |
+ |
if (rdf == NULL) { /* no non-Lambertian reflection? */ |
201 |
+ |
SDfreeBSDF(&myBSDF); |
202 |
+ |
return(cm_bsdf_Lamb(diffBRDF)); |
203 |
+ |
} |
204 |
+ |
if (rdf->ncomp != 1 || rdf->comp[0].func != &SDhandleMtx) { |
205 |
+ |
sprintf(errmsg, "unsupported BSDF '%s'", fname); |
206 |
+ |
error(USER, errmsg); |
207 |
+ |
} |
208 |
+ |
/* convert BRDF to matrix */ |
209 |
+ |
Rmat = cm_bsdf(diffBRDF, (SDMat *)rdf->comp[0].dist); |
210 |
+ |
/* free BSDF and return */ |
211 |
+ |
SDfreeBSDF(&myBSDF); |
212 |
+ |
return(Rmat); |
213 |
|
} |