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#include "trans.h" |
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| 20 |
+ |
#include "tmesh.h" |
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#include <ctype.h> |
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#define TCALNAME "tmesh.cal" /* triangle interp. file */ |
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#define PATNAME "M-pat" /* mesh pattern name (reused) */ |
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#define TEXNAME "M-nor" /* mesh texture name (reused) */ |
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#define DEFOBJ "unnamed" /* default object name */ |
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#define DEFMAT "white" /* default material name */ |
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|
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#define ABS(x) ((x)>=0 ? (x) : -(x)) |
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|
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#define pvect(v) printf("%18.12g %18.12g %18.12g\n",(v)[0],(v)[1],(v)[2]) |
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FVECT *vlist; /* our vertex list */ |
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FLOAT (*vtlist)[2]; /* map vertex list */ |
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int nvts; |
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typedef struct { |
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int ax; /* major axis */ |
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FLOAT tm[2][3]; /* transformation */ |
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} BARYCCM; |
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|
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typedef int VNDX[3]; /* vertex index (point,map,normal) */ |
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#define CHUNKSIZ 256 /* vertex allocation chunk size */ |
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char *mod; |
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VNDX v1i, v2i, v3i; |
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BARYCCM bvecs; |
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< |
FVECT bcoor[3]; |
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> |
FLOAT bcoor[3][3]; |
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int texOK, patOK; |
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register int i; |
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|
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if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3)) |
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return(0); |
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/* compute barycentric coordinates */ |
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< |
texOK = !flatten && (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0); |
| 571 |
> |
if (!flatten && v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0) |
| 572 |
> |
switch (flat_tri(vlist[v1i[0]], vlist[v2i[0]], vlist[v3i[0]], |
| 573 |
> |
vnlist[v1i[2]], vnlist[v2i[2]], vnlist[v3i[2]])) { |
| 574 |
> |
case DEGEN: /* zero area */ |
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> |
return(-1); |
| 576 |
> |
case RVFLAT: /* reversed normals, but flat */ |
| 577 |
> |
case ISFLAT: /* smoothing unnecessary */ |
| 578 |
> |
texOK = 0; |
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> |
break; |
| 580 |
> |
case RVBENT: /* reversed normals with smoothing */ |
| 581 |
> |
case ISBENT: /* proper smoothing */ |
| 582 |
> |
texOK = 1; |
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> |
break; |
| 584 |
> |
} |
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> |
else |
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> |
texOK = 0; |
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#ifdef TEXMAPS |
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patOK = mapname[0] && (v1i[1]>=0 && v2i[1]>=0 && v3i[1]>=0); |
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#else |
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pvect(vlist[v3i[0]]); |
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| 631 |
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return(1); |
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– |
} |
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|
| 625 |
– |
|
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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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– |
int ax0, ax1; |
| 635 |
– |
register int i, j; |
| 636 |
– |
/* compute major axis */ |
| 637 |
– |
for (i = 0; i < 3; i++) { |
| 638 |
– |
vab[i] = v1[i] - v2[i]; |
| 639 |
– |
vcb[i] = v3[i] - v2[i]; |
| 640 |
– |
} |
| 641 |
– |
fcross(va, vab, vcb); |
| 642 |
– |
bcm->ax = ABS(va[0]) > ABS(va[1]) ? 0 : 1; |
| 643 |
– |
bcm->ax = ABS(va[bcm->ax]) > ABS(va[2]) ? bcm->ax : 2; |
| 644 |
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ax0 = (bcm->ax + 1) % 3; |
| 645 |
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ax1 = (bcm->ax + 2) % 3; |
| 646 |
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for (j = 0; j < 2; j++) { |
| 647 |
– |
vab[0] = v1[ax0] - v2[ax0]; |
| 648 |
– |
vcb[0] = v3[ax0] - v2[ax0]; |
| 649 |
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vab[1] = v1[ax1] - v2[ax1]; |
| 650 |
– |
vcb[1] = v3[ax1] - v2[ax1]; |
| 651 |
– |
d = vcb[0]*vcb[0] + vcb[1]*vcb[1]; |
| 652 |
– |
if (d <= FTINY) |
| 653 |
– |
return(-1); |
| 654 |
– |
d = (vcb[0]*vab[0]+vcb[1]*vab[1])/d; |
| 655 |
– |
va[0] = vab[0] - vcb[0]*d; |
| 656 |
– |
va[1] = vab[1] - vcb[1]*d; |
| 657 |
– |
d = va[0]*va[0] + va[1]*va[1]; |
| 658 |
– |
if (d <= FTINY) |
| 659 |
– |
return(-1); |
| 660 |
– |
bcm->tm[j][0] = va[0] /= d; |
| 661 |
– |
bcm->tm[j][1] = va[1] /= d; |
| 662 |
– |
bcm->tm[j][2] = -(v2[ax0]*va[0]+v2[ax1]*va[1]); |
| 663 |
– |
/* rotate vertices */ |
| 664 |
– |
vt = v1; |
| 665 |
– |
v1 = v2; |
| 666 |
– |
v2 = v3; |
| 667 |
– |
v3 = vt; |
| 668 |
– |
} |
| 669 |
– |
return(0); |
| 670 |
– |
} |
| 671 |
– |
|
| 672 |
– |
|
| 673 |
– |
put_baryc(bcm, com, n) /* put barycentric coord. vectors */ |
| 674 |
– |
register BARYCCM *bcm; |
| 675 |
– |
register FVECT com[]; |
| 676 |
– |
int n; |
| 677 |
– |
{ |
| 678 |
– |
double a, b; |
| 679 |
– |
register int i, j; |
| 680 |
– |
|
| 681 |
– |
printf("%d\t%d\n", 1+3*n, bcm->ax); |
| 682 |
– |
for (i = 0; i < n; i++) { |
| 683 |
– |
a = com[i][0] - com[i][2]; |
| 684 |
– |
b = com[i][1] - com[i][2]; |
| 685 |
– |
printf("%14.8f %14.8f %14.8f\n", |
| 686 |
– |
bcm->tm[0][0]*a + bcm->tm[1][0]*b, |
| 687 |
– |
bcm->tm[0][1]*a + bcm->tm[1][1]*b, |
| 688 |
– |
bcm->tm[0][2]*a + bcm->tm[1][2]*b + com[i][2]); |
| 689 |
– |
} |
| 632 |
|
} |
| 633 |
|
|
| 634 |
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|
