| 5 |
|
#endif |
| 6 |
|
|
| 7 |
|
/* |
| 8 |
< |
* Convert a triangle mesh into a Radiance description. |
| 8 |
> |
* Convert a trianglular mesh into a Radiance description. |
| 9 |
|
* |
| 10 |
|
* Unlike most other converters, we have defined a file |
| 11 |
< |
* format for the mesh ourselves. It contains eight types, |
| 11 |
> |
* format for the input ourselves. The format contains eight types, |
| 12 |
|
* each of which is identified by a single letter. These are: |
| 13 |
|
* |
| 14 |
|
* # comment = a comment. Continues until end of line. |
| 15 |
|
* v id Px Py Pz = a vertex. The id must be an integer. |
| 16 |
|
* n Nx Ny Nz = a normal. Corresponds to most recent vertex. |
| 17 |
|
* i Iu Iv = an index. Corresponds to most recent vertex. |
| 18 |
< |
* p picture = a picture. Used as a pattern what follows. |
| 18 |
> |
* p picture = a picture. Used as a pattern for following. |
| 19 |
|
* m material = a material name. Used for what follows. |
| 20 |
+ |
* o object = an object name. Used for what follows. |
| 21 |
|
* t id1 id2 id3 = a triangle. |
| 22 |
|
* |
| 23 |
|
* Only the 't' type results in any output. The others merely set values |
| 27 |
|
* only makes sense for a mesh which is to be put into an octree for |
| 28 |
|
* instancing.) Using a pattern requires that each vertex have an |
| 29 |
|
* associated index value for generating the colorpict primitive. |
| 30 |
+ |
* Likewise, an interpolated surface normal also requires that each |
| 31 |
+ |
* vertex of the triangle have an associated normal vector. |
| 32 |
+ |
* It is not necessary for the normal vectors to have unit length. |
| 33 |
|
*/ |
| 34 |
|
|
| 35 |
|
#include "standard.h" |
| 36 |
|
|
| 37 |
+ |
#define ABS(x) ((x)>=0 ? (x) : -(x)) |
| 38 |
+ |
|
| 39 |
+ |
#define VOIDID "void" /* this is defined in object.h */ |
| 40 |
+ |
|
| 41 |
|
#define CALNAME "tmesh.cal" /* the name of our auxiliary file */ |
| 42 |
< |
#define PATNAME "tpat" /* triangle pattern name (reused) */ |
| 43 |
< |
#define TEXNAME "tnor" /* triangle texture name (reused) */ |
| 42 |
> |
#define PATNAME "T-pat" /* triangle pattern name (reused) */ |
| 43 |
> |
#define TEXNAME "T-nor" /* triangle texture name (reused) */ |
| 44 |
|
|
| 45 |
|
#define V_DEFINED 01 /* this vertex is defined */ |
| 46 |
|
#define V_HASNORM 02 /* vertex has surface normal */ |
| 56 |
|
VERTEX *vlist = NULL; /* our vertex list */ |
| 57 |
|
int nverts = 0; /* number of vertices in our list */ |
| 58 |
|
|
| 59 |
< |
typedef FLOAT BARYCCM[3][4]; |
| 59 |
> |
typedef struct { |
| 60 |
> |
int ax; /* major axis */ |
| 61 |
> |
FLOAT tm[2][3]; /* transformation */ |
| 62 |
> |
} BARYCCM; |
| 63 |
|
|
| 64 |
< |
#define novert(i) ((i)<0|(i)>=nverts||!(vlist[i].flags&V_DEFINED)) |
| 64 |
> |
#define novert(i) ((i)<0|(i)>=nverts || !(vlist[i].flags&V_DEFINED)) |
| 65 |
|
|
| 66 |
|
#define CHUNKSIZ 128 /* vertex allocation chunk size */ |
| 67 |
|
|
| 68 |
|
extern VERTEX *vnew(); /* allocate a vertex (never freed) */ |
| 69 |
|
|
| 70 |
+ |
char *defmat = VOIDID; /* default (starting) material name */ |
| 71 |
+ |
char *defpat = ""; /* default (starting) picture name */ |
| 72 |
+ |
char *defobj = "T"; /* default (starting) object name */ |
| 73 |
|
|
| 74 |
+ |
|
| 75 |
|
main(argc, argv) /* read in T-mesh files and convert */ |
| 76 |
|
int argc; |
| 77 |
|
char *argv[]; |
| 79 |
|
FILE *fp; |
| 80 |
|
int i; |
| 81 |
|
|
| 82 |
< |
if (argc == 1) |
| 82 |
> |
for (i = 1; i < argc && argv[i][0] == '-'; i++) |
| 83 |
> |
switch (argv[i][1]) { |
| 84 |
> |
case 'o': /* object name */ |
| 85 |
> |
defobj = argv[++i]; |
| 86 |
> |
break; |
| 87 |
> |
case 'm': /* default material */ |
| 88 |
> |
defmat = argv[++i]; |
| 89 |
> |
break; |
| 90 |
> |
case 'p': /* default picture */ |
| 91 |
> |
defpat = argv[++i]; |
| 92 |
> |
break; |
| 93 |
> |
default: |
| 94 |
> |
fprintf(stderr, |
| 95 |
> |
"Usage: %s [-o obj][-m mat][-p pic] [file ..]\n", |
| 96 |
> |
argv[0]); |
| 97 |
> |
exit(1); |
| 98 |
> |
} |
| 99 |
> |
if (i >= argc) |
| 100 |
|
convert("<stdin>", stdin); |
| 101 |
|
else |
| 102 |
< |
for (i = 1; i < argc; i++) { |
| 102 |
> |
for ( ; i < argc; i++) { |
| 103 |
|
if ((fp = fopen(argv[i], "r")) == NULL) { |
| 104 |
|
perror(argv[i]); |
| 105 |
|
exit(1); |
| 115 |
|
char *fname; |
| 116 |
|
FILE *fp; |
| 117 |
|
{ |
| 118 |
< |
char typ[2]; |
| 118 |
> |
char typ[4]; |
| 119 |
|
int id[3]; |
| 120 |
|
double vec[3]; |
| 121 |
|
char picfile[128]; |
| 122 |
|
char matname[64]; |
| 123 |
< |
char *err; |
| 124 |
< |
register int c; |
| 125 |
< |
register VERTEX *lastv = NULL; |
| 123 |
> |
char objname[64]; |
| 124 |
> |
register int i; |
| 125 |
> |
register VERTEX *lastv; |
| 126 |
> |
/* start fresh */ |
| 127 |
> |
i = nverts; |
| 128 |
> |
lastv = vlist; |
| 129 |
> |
while (i--) |
| 130 |
> |
(lastv++)->flags = 0; |
| 131 |
> |
lastv = NULL; |
| 132 |
> |
strcpy(picfile, defpat); |
| 133 |
> |
strcpy(matname, defmat); |
| 134 |
> |
strcpy(objname, defobj); |
| 135 |
|
|
| 136 |
< |
picfile[0] = '\0'; |
| 137 |
< |
strcpy(matname, "void"); |
| 97 |
< |
|
| 136 |
> |
printf("\n## T-mesh read from: %s\n", fname); |
| 137 |
> |
/* scan until EOF */ |
| 138 |
|
while (fscanf(fp, "%1s", typ) == 1) |
| 139 |
|
switch (typ[0]) { |
| 140 |
|
case 'v': /* vertex */ |
| 148 |
|
syntax(fname, fp, "Bad triangle"); |
| 149 |
|
if (novert(id[0]) | novert(id[1]) | novert(id[2])) |
| 150 |
|
syntax(fname, fp, "Undefined triangle vertex"); |
| 151 |
< |
triangle(picfile, matname, &vlist[id[0]], |
| 151 |
> |
triangle(picfile, matname, objname, &vlist[id[0]], |
| 152 |
|
&vlist[id[1]], &vlist[id[2]]); |
| 153 |
|
break; |
| 154 |
|
case 'n': /* surface normal */ |
| 173 |
|
lastv->ndx[1] = vec[1]; |
| 174 |
|
lastv->flags |= V_HASINDX; |
| 175 |
|
break; |
| 176 |
+ |
case 'o': /* object name */ |
| 177 |
+ |
if (fscanf(fp, "%s", objname) != 1) |
| 178 |
+ |
syntax(fname, fp, "Bad object name"); |
| 179 |
+ |
break; |
| 180 |
|
case 'm': /* material */ |
| 181 |
|
if (fscanf(fp, "%s", matname) != 1) |
| 182 |
|
syntax(fname, fp, "Bad material"); |
| 183 |
|
if (matname[0] == '-' && !matname[1]) |
| 184 |
< |
strcpy(matname, "void"); |
| 184 |
> |
strcpy(matname, VOIDID); |
| 185 |
|
break; |
| 186 |
|
case 'p': /* picture */ |
| 187 |
|
if (fscanf(fp, "%s", picfile) != 1) |
| 190 |
|
picfile[0] = '\0'; |
| 191 |
|
break; |
| 192 |
|
case '#': /* comment */ |
| 193 |
< |
while ((c = getc(fp)) != EOF && c != '\n') |
| 194 |
< |
; |
| 193 |
> |
fputs("\n#", stdout); |
| 194 |
> |
while ((i = getc(fp)) != EOF) { |
| 195 |
> |
putchar(i); |
| 196 |
> |
if (i == '\n') |
| 197 |
> |
break; |
| 198 |
> |
} |
| 199 |
|
break; |
| 200 |
|
default: |
| 201 |
|
syntax(fname, fp, "Unknown type"); |
| 204 |
|
} |
| 205 |
|
|
| 206 |
|
|
| 207 |
< |
triangle(pn, mn, v1, v2, v3) /* put out a triangle */ |
| 208 |
< |
char *pn, *mn; |
| 207 |
> |
triangle(pn, mod, obj, v1, v2, v3) /* put out a triangle */ |
| 208 |
> |
char *pn, *mod, *obj; |
| 209 |
|
register VERTEX *v1, *v2, *v3; |
| 210 |
|
{ |
| 211 |
|
static int ntri = 0; |
| 164 |
– |
char *mod = mn; |
| 212 |
|
BARYCCM bvecs; |
| 213 |
+ |
FVECT bvm[3]; |
| 214 |
+ |
register int i; |
| 215 |
|
/* compute barycentric coordinates */ |
| 216 |
|
if (v1->flags & v2->flags & v3->flags & (V_HASINDX|V_HASNORM)) |
| 217 |
< |
if (comp_baryc(bvecs, v1->pos, v2->pos, v3->pos) < 0) |
| 217 |
> |
if (comp_baryc(&bvecs, v1->pos, v2->pos, v3->pos) < 0) |
| 218 |
|
return; |
| 219 |
|
/* put out texture (if any) */ |
| 220 |
|
if (v1->flags & v2->flags & v3->flags & V_HASNORM) { |
| 221 |
|
printf("\n%s texfunc %s\n", mod, TEXNAME); |
| 222 |
|
mod = TEXNAME; |
| 223 |
|
printf("4 dx dy dz %s\n", CALNAME); |
| 224 |
< |
printf("0\n21\n"); |
| 225 |
< |
put_baryc(bvecs); |
| 226 |
< |
printf("\t%f %f %f\n", v1->nor[0], v1->nor[1], v1->nor[2]); |
| 227 |
< |
printf("\t%f %f %f\n", v2->nor[0], v2->nor[1], v2->nor[2]); |
| 228 |
< |
printf("\t%f %f %f\n", v3->nor[0], v3->nor[1], v3->nor[2]); |
| 224 |
> |
printf("0\n"); |
| 225 |
> |
for (i = 0; i < 3; i++) { |
| 226 |
> |
bvm[i][0] = v1->nor[i]; |
| 227 |
> |
bvm[i][1] = v2->nor[i]; |
| 228 |
> |
bvm[i][2] = v3->nor[i]; |
| 229 |
> |
} |
| 230 |
> |
put_baryc(&bvecs, bvm, 3); |
| 231 |
|
} |
| 232 |
|
/* put out pattern (if any) */ |
| 233 |
|
if (*pn && (v1->flags & v2->flags & v3->flags & V_HASINDX)) { |
| 234 |
|
printf("\n%s colorpict %s\n", mod, PATNAME); |
| 235 |
|
mod = PATNAME; |
| 236 |
|
printf("7 noneg noneg noneg %s %s u v\n", pn, CALNAME); |
| 237 |
< |
printf("0\n18\n"); |
| 238 |
< |
put_baryc(bvecs); |
| 239 |
< |
printf("\t%f %f\n", v1->ndx[0], v1->ndx[1]); |
| 240 |
< |
printf("\t%f %f\n", v2->ndx[0], v2->ndx[1]); |
| 241 |
< |
printf("\t%f %f\n", v3->ndx[0], v3->ndx[1]); |
| 237 |
> |
printf("0\n"); |
| 238 |
> |
for (i = 0; i < 2; i++) { |
| 239 |
> |
bvm[i][0] = v1->ndx[i]; |
| 240 |
> |
bvm[i][1] = v2->ndx[i]; |
| 241 |
> |
bvm[i][2] = v3->ndx[i]; |
| 242 |
> |
} |
| 243 |
> |
put_baryc(&bvecs, bvm, 2); |
| 244 |
|
} |
| 245 |
|
/* put out triangle */ |
| 246 |
< |
printf("\n%s polygon t%d\n", mod, ++ntri); |
| 246 |
> |
printf("\n%s polygon %s.%d\n", mod, obj, ++ntri); |
| 247 |
|
printf("0\n0\n9\n"); |
| 248 |
|
printf("%18.12g %18.12g %18.12g\n", v1->pos[0],v1->pos[1],v1->pos[2]); |
| 249 |
|
printf("%18.12g %18.12g %18.12g\n", v2->pos[0],v2->pos[1],v2->pos[2]); |
| 253 |
|
|
| 254 |
|
int |
| 255 |
|
comp_baryc(bcm, v1, v2, v3) /* compute barycentric vectors */ |
| 256 |
< |
register BARYCCM bcm; |
| 257 |
< |
FVECT v1, v2, v3; |
| 256 |
> |
register BARYCCM *bcm; |
| 257 |
> |
FLOAT *v1, *v2, *v3; |
| 258 |
|
{ |
| 259 |
|
FLOAT *vt; |
| 260 |
|
FVECT va, vab, vcb; |
| 261 |
|
double d; |
| 262 |
+ |
int ax0, ax1; |
| 263 |
|
register int i, j; |
| 264 |
< |
|
| 265 |
< |
for (j = 0; j < 3; j++) { |
| 266 |
< |
for (i = 0; i < 3; i++) { |
| 267 |
< |
vab[i] = v1[i] - v2[i]; |
| 268 |
< |
vcb[i] = v3[i] - v2[i]; |
| 269 |
< |
} |
| 270 |
< |
d = DOT(vcb,vcb); |
| 264 |
> |
/* compute major axis */ |
| 265 |
> |
for (i = 0; i < 3; i++) { |
| 266 |
> |
vab[i] = v1[i] - v2[i]; |
| 267 |
> |
vcb[i] = v3[i] - v2[i]; |
| 268 |
> |
} |
| 269 |
> |
fcross(va, vab, vcb); |
| 270 |
> |
bcm->ax = ABS(va[0]) > ABS(va[1]) ? 0 : 1; |
| 271 |
> |
bcm->ax = ABS(va[bcm->ax]) > ABS(va[2]) ? bcm->ax : 2; |
| 272 |
> |
ax0 = (bcm->ax + 1) % 3; |
| 273 |
> |
ax1 = (bcm->ax + 2) % 3; |
| 274 |
> |
for (j = 0; j < 2; j++) { |
| 275 |
> |
vab[0] = v1[ax0] - v2[ax0]; |
| 276 |
> |
vcb[0] = v3[ax0] - v2[ax0]; |
| 277 |
> |
vab[1] = v1[ax1] - v2[ax1]; |
| 278 |
> |
vcb[1] = v3[ax1] - v2[ax1]; |
| 279 |
> |
d = vcb[0]*vcb[0] + vcb[1]*vcb[1]; |
| 280 |
|
if (d <= FTINY) |
| 281 |
|
return(-1); |
| 282 |
< |
d = DOT(vcb,vab)/d; |
| 283 |
< |
for (i = 0; i < 3; i++) |
| 284 |
< |
va[i] = vab[i] - vcb[i]*d; |
| 285 |
< |
d = DOT(va,va); |
| 282 |
> |
d = (vcb[0]*vab[0]+vcb[1]*vab[1])/d; |
| 283 |
> |
va[0] = vab[0] - vcb[0]*d; |
| 284 |
> |
va[1] = vab[1] - vcb[1]*d; |
| 285 |
> |
d = va[0]*va[0] + va[1]*va[1]; |
| 286 |
|
if (d <= FTINY) |
| 287 |
|
return(-1); |
| 288 |
< |
for (i = 0; i < 3; i++) { |
| 289 |
< |
va[i] /= d; |
| 290 |
< |
bcm[j][i] = va[i]; |
| 228 |
< |
} |
| 229 |
< |
bcm[j][3] = -DOT(v2,va); |
| 288 |
> |
bcm->tm[j][0] = va[0] /= d; |
| 289 |
> |
bcm->tm[j][1] = va[1] /= d; |
| 290 |
> |
bcm->tm[j][2] = -(v2[ax0]*va[0]+v2[ax1]*va[1]); |
| 291 |
|
/* rotate vertices */ |
| 292 |
|
vt = v1; |
| 293 |
|
v1 = v2; |
| 298 |
|
} |
| 299 |
|
|
| 300 |
|
|
| 301 |
< |
put_baryc(bcm) /* put barycentric coord. vectors */ |
| 302 |
< |
register BARYCCM bcm; |
| 301 |
> |
put_baryc(bcm, com, n) /* put barycentric coord. vectors */ |
| 302 |
> |
register BARYCCM *bcm; |
| 303 |
> |
register FVECT com[]; |
| 304 |
> |
int n; |
| 305 |
|
{ |
| 306 |
< |
register int i; |
| 306 |
> |
double a, b; |
| 307 |
> |
register int i, j; |
| 308 |
|
|
| 309 |
< |
for (i = 0; i < 3; i++) |
| 310 |
< |
printf("%14.8f %14.8f %14.8f %14.8f\n", |
| 311 |
< |
bcm[i][0], bcm[i][1], bcm[i][2], bcm[i][3]); |
| 309 |
> |
printf("%d\t%d\n", 1+3*n, bcm->ax); |
| 310 |
> |
for (i = 0; i < n; i++) { |
| 311 |
> |
a = com[i][0] - com[i][2]; |
| 312 |
> |
b = com[i][1] - com[i][2]; |
| 313 |
> |
printf("%14.8f %14.8f %14.8f\n", |
| 314 |
> |
bcm->tm[0][0]*a + bcm->tm[1][0]*b, |
| 315 |
> |
bcm->tm[0][1]*a + bcm->tm[1][1]*b, |
| 316 |
> |
bcm->tm[0][2]*a + bcm->tm[1][2]*b + com[i][2]); |
| 317 |
> |
} |
| 318 |
|
} |
| 319 |
|
|
| 320 |
|
|
| 325 |
|
{ |
| 326 |
|
register int i; |
| 327 |
|
|
| 328 |
< |
if (id > nverts) { /* get some more */ |
| 328 |
> |
if (id >= nverts) { /* get some more */ |
| 329 |
|
i = nverts; |
| 330 |
< |
nverts = CHUNKSIZ*((id%CHUNKSIZ)+1); |
| 330 |
> |
nverts = CHUNKSIZ*((id/CHUNKSIZ)+1); |
| 331 |
|
if (vlist == NULL) |
| 332 |
|
vlist = (VERTEX *)malloc(nverts*sizeof(VERTEX)); |
| 333 |
|
else |
| 338 |
|
"Out of memory while allocating vertex %d\n", id); |
| 339 |
|
exit(1); |
| 340 |
|
} |
| 341 |
< |
while (i < nverts) /* clear them */ |
| 341 |
> |
while (i < nverts) /* clear what's new */ |
| 342 |
|
vlist[i++].flags = 0; |
| 343 |
|
} |
| 344 |
< |
/* assign it */ |
| 344 |
> |
/* assign new vertex */ |
| 345 |
|
vlist[id].pos[0] = x; |
| 346 |
|
vlist[id].pos[1] = y; |
| 347 |
|
vlist[id].pos[2] = z; |
| 362 |
|
int lineno; |
| 363 |
|
|
| 364 |
|
if (fp == stdin) |
| 365 |
< |
fprintf(stderr, "%s: syntax error: %s\n", fn, er); |
| 365 |
> |
fprintf(stderr, "%s: T-mesh format error: %s\n", fn, er); |
| 366 |
|
else { |
| 367 |
|
cpos = ftell(fp); |
| 368 |
|
fseek(fp, 0L, 0); |
| 373 |
|
if (c == '\n') |
| 374 |
|
lineno++; |
| 375 |
|
} |
| 376 |
< |
fprintf(stderr, "%s: syntax error at line %d: %s\n", |
| 376 |
> |
fprintf(stderr, "%s: T-mesh format error at line %d: %s\n", |
| 377 |
|
fn, lineno, er); |
| 378 |
|
} |
| 379 |
|
exit(1); |
