| 1 |
greg |
2.1 |
/* Copyright (c) 1994 Regents of the University of California */ |
| 2 |
|
|
|
| 3 |
|
|
#ifndef lint |
| 4 |
|
|
static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
|
|
#endif |
| 6 |
|
|
|
| 7 |
|
|
/* |
| 8 |
|
|
* Convert a triangle 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, |
| 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. |
| 19 |
|
|
* m material = a material name. Used for what follows. |
| 20 |
|
|
* t id1 id2 id3 = a triangle. |
| 21 |
|
|
* |
| 22 |
|
|
* Only the 't' type results in any output. The others merely set values |
| 23 |
|
|
* to be used in generating triangles. If no picture or "p -" is given, |
| 24 |
|
|
* there will be no pattern associated with the geometry. If no material |
| 25 |
|
|
* or "m -" is given, no material will be associated. (Note that this |
| 26 |
|
|
* only makes sense for a mesh which is to be put into an octree for |
| 27 |
|
|
* instancing.) Using a pattern requires that each vertex have an |
| 28 |
|
|
* associated index value for generating the colorpict primitive. |
| 29 |
|
|
*/ |
| 30 |
|
|
|
| 31 |
|
|
#include "standard.h" |
| 32 |
|
|
|
| 33 |
|
|
#define CALNAME "tmesh.cal" /* the name of our auxiliary file */ |
| 34 |
|
|
#define PATNAME "tpat" /* triangle pattern name (reused) */ |
| 35 |
|
|
#define TEXNAME "tnor" /* triangle texture name (reused) */ |
| 36 |
|
|
|
| 37 |
|
|
#define V_DEFINED 01 /* this vertex is defined */ |
| 38 |
|
|
#define V_HASNORM 02 /* vertex has surface normal */ |
| 39 |
|
|
#define V_HASINDX 04 /* vertex has index */ |
| 40 |
|
|
|
| 41 |
|
|
typedef struct { |
| 42 |
|
|
short flags; /* vertex flags, from above */ |
| 43 |
|
|
FVECT pos; /* location */ |
| 44 |
|
|
FVECT nor; /* normal */ |
| 45 |
|
|
float ndx[2]; /* picture index */ |
| 46 |
|
|
} VERTEX; |
| 47 |
|
|
|
| 48 |
|
|
VERTEX *vlist = NULL; /* our vertex list */ |
| 49 |
|
|
int nverts = 0; /* number of vertices in our list */ |
| 50 |
|
|
|
| 51 |
|
|
typedef FLOAT BARYCCM[3][4]; |
| 52 |
|
|
|
| 53 |
|
|
#define novert(i) ((i)<0|(i)>=nverts||!(vlist[i].flags&V_DEFINED)) |
| 54 |
|
|
|
| 55 |
|
|
#define CHUNKSIZ 128 /* vertex allocation chunk size */ |
| 56 |
|
|
|
| 57 |
|
|
extern VERTEX *vnew(); /* allocate a vertex (never freed) */ |
| 58 |
|
|
|
| 59 |
|
|
|
| 60 |
|
|
main(argc, argv) /* read in T-mesh files and convert */ |
| 61 |
|
|
int argc; |
| 62 |
|
|
char *argv[]; |
| 63 |
|
|
{ |
| 64 |
|
|
FILE *fp; |
| 65 |
|
|
int i; |
| 66 |
|
|
|
| 67 |
|
|
if (argc == 1) |
| 68 |
|
|
convert("<stdin>", stdin); |
| 69 |
|
|
else |
| 70 |
|
|
for (i = 1; i < argc; i++) { |
| 71 |
|
|
if ((fp = fopen(argv[i], "r")) == NULL) { |
| 72 |
|
|
perror(argv[i]); |
| 73 |
|
|
exit(1); |
| 74 |
|
|
} |
| 75 |
|
|
convert(argv[i], fp); |
| 76 |
|
|
fclose(fp); |
| 77 |
|
|
} |
| 78 |
|
|
exit(0); |
| 79 |
|
|
} |
| 80 |
|
|
|
| 81 |
|
|
|
| 82 |
|
|
convert(fname, fp) /* convert a T-mesh */ |
| 83 |
|
|
char *fname; |
| 84 |
|
|
FILE *fp; |
| 85 |
|
|
{ |
| 86 |
|
|
char typ[2]; |
| 87 |
|
|
int id[3]; |
| 88 |
|
|
double vec[3]; |
| 89 |
|
|
char picfile[128]; |
| 90 |
|
|
char matname[64]; |
| 91 |
|
|
char *err; |
| 92 |
|
|
register int c; |
| 93 |
|
|
register VERTEX *lastv = NULL; |
| 94 |
|
|
|
| 95 |
|
|
picfile[0] = '\0'; |
| 96 |
|
|
strcpy(matname, "void"); |
| 97 |
|
|
|
| 98 |
|
|
while (fscanf(fp, "%1s", typ) == 1) |
| 99 |
|
|
switch (typ[0]) { |
| 100 |
|
|
case 'v': /* vertex */ |
| 101 |
|
|
if (fscanf(fp, "%d %lf %lf %lf", &id[0], |
| 102 |
|
|
&vec[0], &vec[1], &vec[2]) != 4) |
| 103 |
|
|
syntax(fname, fp, "Bad vertex"); |
| 104 |
|
|
lastv = vnew(id[0], vec[0], vec[1], vec[2]); |
| 105 |
|
|
break; |
| 106 |
|
|
case 't': /* triangle */ |
| 107 |
|
|
if (fscanf(fp, "%d %d %d", &id[0], &id[1], &id[2]) != 3) |
| 108 |
|
|
syntax(fname, fp, "Bad triangle"); |
| 109 |
|
|
if (novert(id[0]) | novert(id[1]) | novert(id[2])) |
| 110 |
|
|
syntax(fname, fp, "Undefined triangle vertex"); |
| 111 |
|
|
triangle(picfile, matname, &vlist[id[0]], |
| 112 |
|
|
&vlist[id[1]], &vlist[id[2]]); |
| 113 |
|
|
break; |
| 114 |
|
|
case 'n': /* surface normal */ |
| 115 |
|
|
if (lastv == NULL) |
| 116 |
|
|
syntax(fname, fp, "No vertex for normal"); |
| 117 |
|
|
if (fscanf(fp, "%lf %lf %lf", |
| 118 |
|
|
&vec[0], &vec[1], &vec[2]) != 3) |
| 119 |
|
|
syntax(fname, fp, "Bad vertex normal"); |
| 120 |
|
|
lastv->nor[0] = vec[0]; |
| 121 |
|
|
lastv->nor[1] = vec[1]; |
| 122 |
|
|
lastv->nor[2] = vec[2]; |
| 123 |
|
|
if (normalize(lastv->nor) == 0.0) |
| 124 |
|
|
syntax(fname, fp, "Zero vertex normal"); |
| 125 |
|
|
lastv->flags |= V_HASNORM; |
| 126 |
|
|
break; |
| 127 |
|
|
case 'i': /* index position */ |
| 128 |
|
|
if (lastv == NULL) |
| 129 |
|
|
syntax(fname, fp, "No vertex for index"); |
| 130 |
|
|
if (fscanf(fp, "%lf %lf", &vec[0], &vec[1]) != 2) |
| 131 |
|
|
syntax(fname, fp, "Bad index"); |
| 132 |
|
|
lastv->ndx[0] = vec[0]; |
| 133 |
|
|
lastv->ndx[1] = vec[1]; |
| 134 |
|
|
lastv->flags |= V_HASINDX; |
| 135 |
|
|
break; |
| 136 |
|
|
case 'm': /* material */ |
| 137 |
|
|
if (fscanf(fp, "%s", matname) != 1) |
| 138 |
|
|
syntax(fname, fp, "Bad material"); |
| 139 |
|
|
if (matname[0] == '-' && !matname[1]) |
| 140 |
|
|
strcpy(matname, "void"); |
| 141 |
|
|
break; |
| 142 |
|
|
case 'p': /* picture */ |
| 143 |
|
|
if (fscanf(fp, "%s", picfile) != 1) |
| 144 |
|
|
syntax(fname, fp, "Bad pattern"); |
| 145 |
|
|
if (picfile[0] == '-' && !picfile[1]) |
| 146 |
|
|
picfile[0] = '\0'; |
| 147 |
|
|
break; |
| 148 |
|
|
case '#': /* comment */ |
| 149 |
|
|
while ((c = getc(fp)) != EOF && c != '\n') |
| 150 |
|
|
; |
| 151 |
|
|
break; |
| 152 |
|
|
default: |
| 153 |
|
|
syntax(fname, fp, "Unknown type"); |
| 154 |
|
|
break; |
| 155 |
|
|
} |
| 156 |
|
|
} |
| 157 |
|
|
|
| 158 |
|
|
|
| 159 |
|
|
triangle(pn, mn, v1, v2, v3) /* put out a triangle */ |
| 160 |
|
|
char *pn, *mn; |
| 161 |
|
|
register VERTEX *v1, *v2, *v3; |
| 162 |
|
|
{ |
| 163 |
|
|
static int ntri = 0; |
| 164 |
|
|
char *mod = mn; |
| 165 |
|
|
BARYCCM bvecs; |
| 166 |
|
|
/* compute barycentric coordinates */ |
| 167 |
|
|
if (v1->flags & v2->flags & v3->flags & (V_HASINDX|V_HASNORM)) |
| 168 |
|
|
if (comp_baryc(bvecs, v1->pos, v2->pos, v3->pos) < 0) |
| 169 |
|
|
return; |
| 170 |
|
|
/* put out texture (if any) */ |
| 171 |
|
|
if (v1->flags & v2->flags & v3->flags & V_HASNORM) { |
| 172 |
|
|
printf("\n%s texfunc %s\n", mod, TEXNAME); |
| 173 |
|
|
mod = TEXNAME; |
| 174 |
|
|
printf("4 dx dy dz %s\n", CALNAME); |
| 175 |
|
|
printf("0\n21\n"); |
| 176 |
|
|
put_baryc(bvecs); |
| 177 |
|
|
printf("\t%f %f %f\n", v1->nor[0], v1->nor[1], v1->nor[2]); |
| 178 |
|
|
printf("\t%f %f %f\n", v2->nor[0], v2->nor[1], v2->nor[2]); |
| 179 |
|
|
printf("\t%f %f %f\n", v3->nor[0], v3->nor[1], v3->nor[2]); |
| 180 |
|
|
} |
| 181 |
|
|
/* put out pattern (if any) */ |
| 182 |
|
|
if (*pn && (v1->flags & v2->flags & v3->flags & V_HASINDX)) { |
| 183 |
|
|
printf("\n%s colorpict %s\n", mod, PATNAME); |
| 184 |
|
|
mod = PATNAME; |
| 185 |
|
|
printf("7 noneg noneg noneg %s %s u v\n", pn, CALNAME); |
| 186 |
|
|
printf("0\n18\n"); |
| 187 |
|
|
put_baryc(bvecs); |
| 188 |
|
|
printf("\t%f %f\n", v1->ndx[0], v1->ndx[1]); |
| 189 |
|
|
printf("\t%f %f\n", v2->ndx[0], v2->ndx[1]); |
| 190 |
|
|
printf("\t%f %f\n", v3->ndx[0], v3->ndx[1]); |
| 191 |
|
|
} |
| 192 |
|
|
/* put out triangle */ |
| 193 |
|
|
printf("\n%s polygon t%d\n", mod, ++ntri); |
| 194 |
|
|
printf("0\n0\n9\n"); |
| 195 |
|
|
printf("%18.12g %18.12g %18.12g\n", v1->pos[0],v1->pos[1],v1->pos[2]); |
| 196 |
|
|
printf("%18.12g %18.12g %18.12g\n", v2->pos[0],v2->pos[1],v2->pos[2]); |
| 197 |
|
|
printf("%18.12g %18.12g %18.12g\n", v3->pos[0],v3->pos[1],v3->pos[2]); |
| 198 |
|
|
} |
| 199 |
|
|
|
| 200 |
|
|
|
| 201 |
|
|
int |
| 202 |
|
|
comp_baryc(bcm, v1, v2, v3) /* compute barycentric vectors */ |
| 203 |
|
|
register BARYCCM bcm; |
| 204 |
|
|
FVECT v1, v2, v3; |
| 205 |
|
|
{ |
| 206 |
|
|
FLOAT *vt; |
| 207 |
|
|
FVECT va, vab, vcb; |
| 208 |
|
|
double d; |
| 209 |
|
|
register int i, j; |
| 210 |
|
|
|
| 211 |
|
|
for (j = 0; j < 3; j++) { |
| 212 |
|
|
for (i = 0; i < 3; i++) { |
| 213 |
|
|
vab[i] = v1[i] - v2[i]; |
| 214 |
|
|
vcb[i] = v3[i] - v2[i]; |
| 215 |
|
|
} |
| 216 |
|
|
d = DOT(vcb,vcb); |
| 217 |
|
|
if (d <= FTINY) |
| 218 |
|
|
return(-1); |
| 219 |
|
|
d = DOT(vcb,vab)/d; |
| 220 |
|
|
for (i = 0; i < 3; i++) |
| 221 |
|
|
va[i] = vab[i] - vcb[i]*d; |
| 222 |
|
|
d = DOT(va,va); |
| 223 |
|
|
if (d <= FTINY) |
| 224 |
|
|
return(-1); |
| 225 |
|
|
for (i = 0; i < 3; i++) { |
| 226 |
|
|
va[i] /= d; |
| 227 |
|
|
bcm[j][i] = va[i]; |
| 228 |
|
|
} |
| 229 |
|
|
bcm[j][3] = -DOT(v2,va); |
| 230 |
|
|
/* rotate vertices */ |
| 231 |
|
|
vt = v1; |
| 232 |
|
|
v1 = v2; |
| 233 |
|
|
v2 = v3; |
| 234 |
|
|
v3 = vt; |
| 235 |
|
|
} |
| 236 |
|
|
return(0); |
| 237 |
|
|
} |
| 238 |
|
|
|
| 239 |
|
|
|
| 240 |
|
|
put_baryc(bcm) /* put barycentric coord. vectors */ |
| 241 |
|
|
register BARYCCM bcm; |
| 242 |
|
|
{ |
| 243 |
|
|
register int i; |
| 244 |
|
|
|
| 245 |
|
|
for (i = 0; i < 3; i++) |
| 246 |
|
|
printf("%14.8f %14.8f %14.8f %14.8f\n", |
| 247 |
|
|
bcm[i][0], bcm[i][1], bcm[i][2], bcm[i][3]); |
| 248 |
|
|
} |
| 249 |
|
|
|
| 250 |
|
|
|
| 251 |
|
|
VERTEX * |
| 252 |
|
|
vnew(id, x, y, z) /* create a new vertex */ |
| 253 |
|
|
register int id; |
| 254 |
|
|
double x, y, z; |
| 255 |
|
|
{ |
| 256 |
|
|
register int i; |
| 257 |
|
|
|
| 258 |
|
|
if (id > nverts) { /* get some more */ |
| 259 |
|
|
i = nverts; |
| 260 |
|
|
nverts = CHUNKSIZ*((id%CHUNKSIZ)+1); |
| 261 |
|
|
if (vlist == NULL) |
| 262 |
|
|
vlist = (VERTEX *)malloc(nverts*sizeof(VERTEX)); |
| 263 |
|
|
else |
| 264 |
|
|
vlist = (VERTEX *)realloc((char *)vlist, |
| 265 |
|
|
nverts*sizeof(VERTEX)); |
| 266 |
|
|
if (vlist == NULL) { |
| 267 |
|
|
fprintf(stderr, |
| 268 |
|
|
"Out of memory while allocating vertex %d\n", id); |
| 269 |
|
|
exit(1); |
| 270 |
|
|
} |
| 271 |
|
|
while (i < nverts) /* clear them */ |
| 272 |
|
|
vlist[i++].flags = 0; |
| 273 |
|
|
} |
| 274 |
|
|
/* assign it */ |
| 275 |
|
|
vlist[id].pos[0] = x; |
| 276 |
|
|
vlist[id].pos[1] = y; |
| 277 |
|
|
vlist[id].pos[2] = z; |
| 278 |
|
|
vlist[id].flags = V_DEFINED; |
| 279 |
|
|
/* return it */ |
| 280 |
|
|
return(&vlist[id]); |
| 281 |
|
|
} |
| 282 |
|
|
|
| 283 |
|
|
|
| 284 |
|
|
syntax(fn, fp, er) /* report syntax error and exit */ |
| 285 |
|
|
char *fn; |
| 286 |
|
|
register FILE *fp; |
| 287 |
|
|
char *er; |
| 288 |
|
|
{ |
| 289 |
|
|
extern long ftell(); |
| 290 |
|
|
register long cpos; |
| 291 |
|
|
register int c; |
| 292 |
|
|
int lineno; |
| 293 |
|
|
|
| 294 |
|
|
if (fp == stdin) |
| 295 |
|
|
fprintf(stderr, "%s: syntax error: %s\n", fn, er); |
| 296 |
|
|
else { |
| 297 |
|
|
cpos = ftell(fp); |
| 298 |
|
|
fseek(fp, 0L, 0); |
| 299 |
|
|
lineno = 1; |
| 300 |
|
|
while (cpos-- > 0) { |
| 301 |
|
|
if ((c = getc(fp)) == EOF) |
| 302 |
|
|
break; |
| 303 |
|
|
if (c == '\n') |
| 304 |
|
|
lineno++; |
| 305 |
|
|
} |
| 306 |
|
|
fprintf(stderr, "%s: syntax error at line %d: %s\n", |
| 307 |
|
|
fn, lineno, er); |
| 308 |
|
|
} |
| 309 |
|
|
exit(1); |
| 310 |
|
|
} |
