| 9 |
|
#include "copyright.h" |
| 10 |
|
#include "standard.h" |
| 11 |
|
#include "cvmesh.h" |
| 12 |
+ |
#include "triangulate.h" |
| 13 |
|
#include <ctype.h> |
| 14 |
|
|
| 15 |
|
typedef int VNDX[3]; /* vertex index (point,map,normal) */ |
| 245 |
|
return(1); |
| 246 |
|
} |
| 247 |
|
|
| 248 |
+ |
/* determine dominant axis for triangle */ |
| 249 |
+ |
static int |
| 250 |
+ |
dominant_axis(char *v1, char *v2, char *v3) |
| 251 |
+ |
{ |
| 252 |
+ |
int v1i = atoi(v1), v2i = atoi(v2), v3i = atoi(v3); |
| 253 |
+ |
FVECT e1, e2, vn; |
| 254 |
+ |
int i, imax; |
| 255 |
|
|
| 256 |
+ |
VSUB(e1, vlist[v2i], vlist[v1i]); |
| 257 |
+ |
VSUB(e2, vlist[v3i], vlist[v2i]); |
| 258 |
+ |
VCROSS(vn, e1, e2); |
| 259 |
+ |
for (i = imax = 2; i--; ) |
| 260 |
+ |
if (vn[i]*vn[i] > vn[imax]*vn[imax]) |
| 261 |
+ |
imax = i; |
| 262 |
+ |
return(vn[imax]*vn[imax] > FTINY ? imax : -1); |
| 263 |
+ |
} |
| 264 |
+ |
|
| 265 |
+ |
/* callback for triangle output from polygon */ |
| 266 |
|
static int |
| 267 |
+ |
tri_out(const Vert2_list *tp, int a, int b, int c) |
| 268 |
+ |
{ |
| 269 |
+ |
return( puttri( ((char **)tp->p)[a], |
| 270 |
+ |
((char **)tp->p)[b], |
| 271 |
+ |
((char **)tp->p)[c] ) ); |
| 272 |
+ |
} |
| 273 |
+ |
|
| 274 |
+ |
static int |
| 275 |
|
putface( /* put out an N-sided polygon */ |
| 276 |
|
int ac, |
| 277 |
|
char **av |
| 278 |
|
) |
| 279 |
|
{ |
| 280 |
< |
char *cp; |
| 281 |
< |
int i; |
| 280 |
> |
Vert2_list *poly = polyAlloc(ac); |
| 281 |
> |
int i, ax, ay; |
| 282 |
|
|
| 283 |
< |
while (ac > 3) { /* break into triangles */ |
| 284 |
< |
if (!puttri(av[0], av[1], av[2])) |
| 283 |
> |
if (poly == NULL) |
| 284 |
> |
return(0); |
| 285 |
> |
poly->p = (void *)av; |
| 286 |
> |
for (i = ac-3; i >= 0; i--) /* identify dominant axis */ |
| 287 |
> |
if ((ax = dominant_axis(av[i], av[i+1], av[i+2])) >= 0) |
| 288 |
> |
break; |
| 289 |
> |
if (ax < 0) |
| 290 |
> |
return(0); |
| 291 |
> |
if (++ax >= 3) ax = 0; |
| 292 |
> |
ay = ax; |
| 293 |
> |
if (++ay >= 3) ay = 0; |
| 294 |
> |
for (i = 0; i < ac; i++) { /* convert to 2-D polygon */ |
| 295 |
> |
VNDX vi; |
| 296 |
> |
if (!cvtndx(vi, av[i])) { |
| 297 |
> |
error(WARNING, "bad vertex reference"); |
| 298 |
> |
polyFree(poly); |
| 299 |
|
return(0); |
| 300 |
< |
ac--; /* remove vertex & rotate */ |
| 301 |
< |
cp = av[0]; |
| 302 |
< |
for (i = 0; i < ac-1; i++) |
| 263 |
< |
av[i] = av[i+2]; |
| 264 |
< |
av[i] = cp; |
| 300 |
> |
} |
| 301 |
> |
poly->v[i].mX = vlist[vi[0]][ax]; |
| 302 |
> |
poly->v[i].mY = vlist[vi[0]][ay]; |
| 303 |
|
} |
| 304 |
< |
return(puttri(av[0], av[1], av[2])); |
| 304 |
> |
/* break into triangles & output */ |
| 305 |
> |
if (!polyTriangulate(poly, &tri_out)) |
| 306 |
> |
return(0); |
| 307 |
> |
polyFree(poly); |
| 308 |
> |
return(1); |
| 309 |
|
} |
| 310 |
|
|
| 311 |
|
|
