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#include "standard.h" |
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#include "tmesh.h" |
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#define VOIDID "void" /* this is defined in object.h */ |
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#define CALNAME "tmesh.cal" /* the name of our auxiliary file */ |
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#define PATNAME "T-pat" /* triangle pattern name (reused) */ |
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#define TEXNAME "T-nor" /* triangle texture name (reused) */ |
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VERTEX *vlist = NULL; /* our vertex list */ |
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int nverts = 0; /* number of vertices in our list */ |
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typedef FLOAT BARYCCM[3][4]; |
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#define novert(i) ((i)<0|(i)>=nverts || !(vlist[i].flags&V_DEFINED)) |
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#define CHUNKSIZ 128 /* vertex allocation chunk size */ |
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{ |
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static int ntri = 0; |
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BARYCCM bvecs; |
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FLOAT bvm[3][3]; |
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register int i; |
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/* compute barycentric coordinates */ |
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if (v1->flags & v2->flags & v3->flags & (V_HASINDX|V_HASNORM)) |
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if (comp_baryc(bvecs, v1->pos, v2->pos, v3->pos) < 0) |
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if (comp_baryc(&bvecs, v1->pos, v2->pos, v3->pos) < 0) |
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return; |
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/* put out texture (if any) */ |
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if (v1->flags & v2->flags & v3->flags & V_HASNORM) { |
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printf("\n%s texfunc %s\n", mod, TEXNAME); |
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mod = TEXNAME; |
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printf("4 dx dy dz %s\n", CALNAME); |
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printf("0\n21\n"); |
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put_baryc(bvecs); |
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printf("\t%14.12g %14.12g %14.12g\n", |
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v1->nor[0], v2->nor[0], v3->nor[0]); |
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printf("\t%14.12g %14.12g %14.12g\n", |
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v1->nor[1], v2->nor[1], v3->nor[1]); |
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< |
printf("\t%14.12g %14.12g %14.12g\n", |
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< |
v1->nor[2], v2->nor[2], v3->nor[2]); |
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> |
printf("4 dx dy dz %s\n", TCALNAME); |
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> |
printf("0\n"); |
| 219 |
> |
for (i = 0; i < 3; i++) { |
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> |
bvm[i][0] = v1->nor[i]; |
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> |
bvm[i][1] = v2->nor[i]; |
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> |
bvm[i][2] = v3->nor[i]; |
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} |
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> |
put_baryc(&bvecs, bvm, 3); |
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} |
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/* put out pattern (if any) */ |
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if (*pn && (v1->flags & v2->flags & v3->flags & V_HASINDX)) { |
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printf("\n%s colorpict %s\n", mod, PATNAME); |
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mod = PATNAME; |
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< |
printf("7 noneg noneg noneg %s %s u v\n", pn, CALNAME); |
| 231 |
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printf("0\n18\n"); |
| 232 |
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put_baryc(bvecs); |
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< |
printf("\t%f %f %f\n", v1->ndx[0], v2->ndx[0], v3->ndx[0]); |
| 234 |
< |
printf("\t%f %f %f\n", v1->ndx[1], v2->ndx[1], v3->ndx[1]); |
| 230 |
> |
printf("7 noneg noneg noneg %s %s u v\n", pn, TCALNAME); |
| 231 |
> |
printf("0\n"); |
| 232 |
> |
for (i = 0; i < 2; i++) { |
| 233 |
> |
bvm[i][0] = v1->ndx[i]; |
| 234 |
> |
bvm[i][1] = v2->ndx[i]; |
| 235 |
> |
bvm[i][2] = v3->ndx[i]; |
| 236 |
> |
} |
| 237 |
> |
put_baryc(&bvecs, bvm, 2); |
| 238 |
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} |
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/* put out triangle */ |
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printf("\n%s polygon %s.%d\n", mod, obj, ++ntri); |
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printf("%18.12g %18.12g %18.12g\n", v1->pos[0],v1->pos[1],v1->pos[2]); |
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printf("%18.12g %18.12g %18.12g\n", v2->pos[0],v2->pos[1],v2->pos[2]); |
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printf("%18.12g %18.12g %18.12g\n", v3->pos[0],v3->pos[1],v3->pos[2]); |
| 242 |
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} |
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|
| 244 |
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|
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int |
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comp_baryc(bcm, v1, v2, v3) /* compute barycentric vectors */ |
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register BARYCCM bcm; |
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FLOAT *v1, *v2, *v3; |
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{ |
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FLOAT *vt; |
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FVECT va, vab, vcb; |
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double d; |
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register int i, j; |
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|
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for (j = 0; j < 3; j++) { |
| 256 |
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for (i = 0; i < 3; i++) { |
| 257 |
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vab[i] = v1[i] - v2[i]; |
| 258 |
– |
vcb[i] = v3[i] - v2[i]; |
| 259 |
– |
} |
| 260 |
– |
d = DOT(vcb,vcb); |
| 261 |
– |
if (d <= FTINY) |
| 262 |
– |
return(-1); |
| 263 |
– |
d = DOT(vcb,vab)/d; |
| 264 |
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for (i = 0; i < 3; i++) |
| 265 |
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va[i] = vab[i] - vcb[i]*d; |
| 266 |
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d = DOT(va,va); |
| 267 |
– |
if (d <= FTINY) |
| 268 |
– |
return(-1); |
| 269 |
– |
for (i = 0; i < 3; i++) { |
| 270 |
– |
va[i] /= d; |
| 271 |
– |
bcm[j][i] = va[i]; |
| 272 |
– |
} |
| 273 |
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bcm[j][3] = -DOT(v2,va); |
| 274 |
– |
/* rotate vertices */ |
| 275 |
– |
vt = v1; |
| 276 |
– |
v1 = v2; |
| 277 |
– |
v2 = v3; |
| 278 |
– |
v3 = vt; |
| 279 |
– |
} |
| 280 |
– |
return(0); |
| 281 |
– |
} |
| 282 |
– |
|
| 283 |
– |
|
| 284 |
– |
put_baryc(bcm) /* put barycentric coord. vectors */ |
| 285 |
– |
register BARYCCM bcm; |
| 286 |
– |
{ |
| 287 |
– |
register int i; |
| 288 |
– |
|
| 289 |
– |
for (i = 0; i < 3; i++) |
| 290 |
– |
printf("%14.8f %14.8f %14.8f %14.8f\n", |
| 291 |
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bcm[i][0], bcm[i][1], bcm[i][2], bcm[i][3]); |
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} |
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