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*/ |
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#include <stdio.h> |
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#include "fvect.h" |
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#include "tmesh.h" |
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#define ABS(x) ((x) >= 0 ? (x) : -(x)) |
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int |
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flat_tri(v1, v2, v3, n1, n2, n3) /* determine if triangle is flat */ |
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FVECT v1, v2, v3, n1, n2, n3; |
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flat_tri( /* determine if triangle is flat */ |
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FVECT v1, |
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> |
FVECT v2, |
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> |
FVECT v3, |
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FVECT n1, |
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> |
FVECT n2, |
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> |
FVECT n3 |
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) |
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{ |
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double d1, d2, d3; |
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FVECT vt1, vt2, vn; |
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/* compute default normal */ |
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vt1[0] = v2[0] - v1[0]; vt1[1] = v2[1] - v1[1]; vt1[2] = v2[2] - v1[2]; |
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vt2[0] = v3[0] - v2[0]; vt2[1] = v3[1] - v2[1]; vt2[2] = v3[2] - v2[2]; |
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< |
fcross(vn, vt1, vt2); |
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> |
VSUB(vt1, v2, v1); |
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> |
VSUB(vt2, v3, v2); |
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VCROSS(vn, vt1, vt2); |
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if (normalize(vn) == 0.0) |
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return(DEGEN); |
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/* compare to supplied normals */ |
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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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> |
comp_baryc( /* compute barycentric vectors */ |
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> |
BARYCCM *bcm, |
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> |
RREAL *v1, |
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> |
RREAL *v2, |
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> |
RREAL *v3 |
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> |
) |
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{ |
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FLOAT *vt; |
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RREAL *vt; |
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FVECT va, vab, vcb; |
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double d; |
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int ax0, ax1; |
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register int i; |
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> |
int i; |
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/* compute major axis */ |
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< |
for (i = 0; i < 3; i++) { |
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< |
vab[i] = v1[i] - v2[i]; |
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< |
vcb[i] = v3[i] - v2[i]; |
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} |
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fcross(va, vab, vcb); |
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< |
bcm->ax = ABS(va[0]) > ABS(va[1]) ? 0 : 1; |
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bcm->ax = ABS(va[bcm->ax]) > ABS(va[2]) ? bcm->ax : 2; |
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< |
ax0 = (bcm->ax + 1) % 3; |
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< |
ax1 = (bcm->ax + 2) % 3; |
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> |
VSUB(vab, v1, v2); |
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> |
VSUB(vcb, v3, v2); |
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> |
VCROSS(va, vab, vcb); |
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> |
bcm->ax = (va[1]*va[1] > va[0]*va[0]); |
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> |
if (va[2]*va[2] > va[bcm->ax]*va[bcm->ax]) bcm->ax = 2; |
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> |
ax0 = (bcm->ax + 1)%3; |
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> |
ax1 = (bcm->ax + 2)%3; |
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for (i = 0; i < 2; i++) { |
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vab[0] = v1[ax0] - v2[ax0]; |
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vcb[0] = v3[ax0] - v2[ax0]; |
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d = vcb[0]*vcb[0] + vcb[1]*vcb[1]; |
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if (d <= FTINY*FTINY) |
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return(-1); |
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< |
d = (vcb[0]*vab[0]+vcb[1]*vab[1])/d; |
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> |
d = (vcb[0]*vab[0] + vcb[1]*vab[1])/d; |
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va[0] = vab[0] - vcb[0]*d; |
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va[1] = vab[1] - vcb[1]*d; |
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d = va[0]*va[0] + va[1]*va[1]; |
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d = 1.0/d; |
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bcm->tm[i][0] = va[0] *= d; |
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bcm->tm[i][1] = va[1] *= d; |
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< |
bcm->tm[i][2] = -(v2[ax0]*va[0]+v2[ax1]*va[1]); |
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> |
bcm->tm[i][2] = -(v2[ax0]*va[0] + v2[ax1]*va[1]); |
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/* rotate vertices */ |
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vt = v1; |
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v1 = v2; |
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} |
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< |
put_baryc(bcm, com, n) /* put barycentric coord. vectors */ |
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< |
register BARYCCM *bcm; |
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< |
register FLOAT com[][3]; |
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< |
int n; |
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> |
void |
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> |
eval_baryc( /* evaluate barycentric weights at p */ |
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> |
RREAL wt[3], |
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> |
FVECT p, |
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> |
BARYCCM *bcm |
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> |
) |
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{ |
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+ |
double u, v; |
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+ |
int i; |
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+ |
|
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+ |
if ((i = bcm->ax + 1) >= 3) i -= 3; |
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+ |
u = p[i]; |
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+ |
if (++i >= 3) i -= 3; |
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+ |
v = p[i]; |
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+ |
wt[0] = u*bcm->tm[0][0] + v*bcm->tm[0][1] + bcm->tm[0][2]; |
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wt[1] = u*bcm->tm[1][0] + v*bcm->tm[1][1] + bcm->tm[1][2]; |
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wt[2] = 1. - wt[1] - wt[0]; |
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+ |
} |
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+ |
|
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+ |
|
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+ |
int |
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+ |
get_baryc( /* compute barycentric weights at p */ |
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+ |
RREAL wt[3], |
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+ |
FVECT p, |
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+ |
FVECT v1, |
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+ |
FVECT v2, |
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+ |
FVECT v3 |
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+ |
) |
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+ |
{ |
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+ |
BARYCCM bcm; |
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+ |
|
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+ |
if (comp_baryc(&bcm, v1, v2, v3) < 0) |
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+ |
return(-1); |
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eval_baryc(wt, p, &bcm); |
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+ |
return(0); |
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+ |
} |
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+ |
|
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+ |
|
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+ |
#if 0 |
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+ |
int |
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+ |
get_baryc(wt, p, v1, v2, v3) /* compute barycentric weights at p */ |
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+ |
RREAL wt[3]; |
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+ |
FVECT p; |
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+ |
FVECT v1, v2, v3; |
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+ |
{ |
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+ |
FVECT ac, bc, pc, cros; |
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+ |
double normf; |
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+ |
/* area formula w/o 2-D optimization */ |
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+ |
VSUB(ac, v1, v3); |
| 142 |
+ |
VSUB(bc, v2, v3); |
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+ |
VSUB(pc, p, v3); |
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+ |
VCROSS(cros, ac, bc); |
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+ |
normf = DOT(cros,cros) |
| 146 |
+ |
if (normf <= 0.0) |
| 147 |
+ |
return(-1); |
| 148 |
+ |
normf = 1./sqrt(normf); |
| 149 |
+ |
VCROSS(cros, bc, pc); |
| 150 |
+ |
wt[0] = VLEN(cros) * normf; |
| 151 |
+ |
VCROSS(cros, ac, pc); |
| 152 |
+ |
wt[1] = VLEN(cros) * normf; |
| 153 |
+ |
wt[2] = 1. - wt[1] - wt[0]; |
| 154 |
+ |
return(0); |
| 155 |
+ |
} |
| 156 |
+ |
#endif |
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+ |
|
| 158 |
+ |
|
| 159 |
+ |
void |
| 160 |
+ |
fput_baryc( /* put barycentric coord. vectors */ |
| 161 |
+ |
BARYCCM *bcm, |
| 162 |
+ |
RREAL com[][3], |
| 163 |
+ |
int n, |
| 164 |
+ |
FILE *fp |
| 165 |
+ |
) |
| 166 |
+ |
{ |
| 167 |
|
double a, b; |
| 168 |
< |
register int i, j; |
| 168 |
> |
int i; |
| 169 |
|
|
| 170 |
< |
printf("%d\t%d\n", 1+3*n, bcm->ax); |
| 170 |
> |
fprintf(fp, "%d\t%d\n", 1+3*n, bcm->ax); |
| 171 |
|
for (i = 0; i < n; i++) { |
| 172 |
|
a = com[i][0] - com[i][2]; |
| 173 |
|
b = com[i][1] - com[i][2]; |
| 174 |
< |
printf("%14.8f %14.8f %14.8f\n", |
| 174 |
> |
fprintf(fp, "%14.8f %14.8f %14.8f\n", |
| 175 |
|
bcm->tm[0][0]*a + bcm->tm[1][0]*b, |
| 176 |
|
bcm->tm[0][1]*a + bcm->tm[1][1]*b, |
| 177 |
|
bcm->tm[0][2]*a + bcm->tm[1][2]*b + com[i][2]); |
