21 |
|
double d1, d2, d3; |
22 |
|
FVECT vt1, vt2, vn; |
23 |
|
/* compute default normal */ |
24 |
< |
vt1[0] = v2[0] - v1[0]; vt1[1] = v2[1] - v1[1]; vt1[2] = v2[2] - v1[2]; |
25 |
< |
vt2[0] = v3[0] - v2[0]; vt2[1] = v3[1] - v2[1]; vt2[2] = v3[2] - v2[2]; |
26 |
< |
fcross(vn, vt1, vt2); |
24 |
> |
VSUB(vt1, v2, v1); |
25 |
> |
VSUB(vt2, v3, v2); |
26 |
> |
VCROSS(vn, vt1, vt2); |
27 |
|
if (normalize(vn) == 0.0) |
28 |
|
return(DEGEN); |
29 |
|
/* compare to supplied normals */ |
42 |
|
int |
43 |
|
comp_baryc(bcm, v1, v2, v3) /* compute barycentric vectors */ |
44 |
|
register BARYCCM *bcm; |
45 |
< |
FLOAT *v1, *v2, *v3; |
45 |
> |
FLOAT *v1, *v2, *v3; |
46 |
|
{ |
47 |
|
FLOAT *vt; |
48 |
|
FVECT va, vab, vcb; |
50 |
|
int ax0, ax1; |
51 |
|
register int i; |
52 |
|
/* compute major axis */ |
53 |
< |
for (i = 0; i < 3; i++) { |
54 |
< |
vab[i] = v1[i] - v2[i]; |
55 |
< |
vcb[i] = v3[i] - v2[i]; |
56 |
< |
} |
57 |
< |
fcross(va, vab, vcb); |
53 |
> |
VSUB(vab, v1, v2); |
54 |
> |
VSUB(vcb, v3, v2); |
55 |
> |
VCROSS(va, vab, vcb); |
56 |
|
bcm->ax = ABS(va[0]) > ABS(va[1]) ? 0 : 1; |
57 |
|
bcm->ax = ABS(va[bcm->ax]) > ABS(va[2]) ? bcm->ax : 2; |
58 |
|
ax0 = (bcm->ax + 1) % 3; |
85 |
|
} |
86 |
|
|
87 |
|
|
88 |
< |
put_baryc(bcm, com, n) /* put barycentric coord. vectors */ |
88 |
> |
void |
89 |
> |
eval_baryc(wt, p, bcm) /* evaluate barycentric weights at p */ |
90 |
> |
FLOAT wt[3]; |
91 |
> |
FVECT p; |
92 |
|
register BARYCCM *bcm; |
93 |
< |
register FLOAT com[][3]; |
94 |
< |
int n; |
93 |
> |
{ |
94 |
> |
double u, v; |
95 |
> |
|
96 |
> |
u = p[(bcm->ax + 1) % 3]; |
97 |
> |
v = p[(bcm->ax + 2) % 3]; |
98 |
> |
wt[0] = u*bcm->tm[0][0] + v*bcm->tm[0][1] + bcm->tm[0][2]; |
99 |
> |
wt[1] = u*bcm->tm[1][0] + v*bcm->tm[1][1] + bcm->tm[1][2]; |
100 |
> |
wt[2] = 1. - wt[1] - wt[0]; |
101 |
> |
} |
102 |
> |
|
103 |
> |
|
104 |
> |
int |
105 |
> |
get_baryc(wt, p, v1, v2, v3) /* compute barycentric weights at p */ |
106 |
> |
FLOAT wt[3]; |
107 |
> |
FVECT p; |
108 |
> |
FVECT v1, v2, v3; |
109 |
> |
{ |
110 |
> |
BARYCCM bcm; |
111 |
> |
|
112 |
> |
if (comp_baryc(&bcm, v1, v2, v3) < 0) |
113 |
> |
return(-1); |
114 |
> |
eval_baryc(wt, p, &bcm); |
115 |
> |
return(0); |
116 |
> |
} |
117 |
> |
|
118 |
> |
|
119 |
> |
#if 0 |
120 |
> |
int |
121 |
> |
get_baryc(wt, p, v1, v2, v3) /* compute barycentric weights at p */ |
122 |
> |
FLOAT wt[3]; |
123 |
> |
FVECT p; |
124 |
> |
FVECT v1, v2, v3; |
125 |
> |
{ |
126 |
> |
FVECT ac, bc, pc, cros; |
127 |
> |
double normf; |
128 |
> |
/* area formula w/o 2-D optimization */ |
129 |
> |
VSUB(ac, v1, v3); |
130 |
> |
VSUB(bc, v2, v3); |
131 |
> |
VSUB(pc, p, v3); |
132 |
> |
VCROSS(cros, ac, bc); |
133 |
> |
normf = DOT(cros,cros) |
134 |
> |
if (normf <= 0.0) |
135 |
> |
return(-1); |
136 |
> |
normf = 1./sqrt(normf); |
137 |
> |
VCROSS(cros, bc, pc); |
138 |
> |
wt[0] = VLEN(cros) * normf; |
139 |
> |
VCROSS(cros, ac, pc); |
140 |
> |
wt[1] = VLEN(cros) * normf; |
141 |
> |
wt[2] = 1. - wt[1] - wt[0]; |
142 |
> |
return(0); |
143 |
> |
} |
144 |
> |
#endif |
145 |
> |
|
146 |
> |
|
147 |
> |
void |
148 |
> |
put_baryc(bcm, com, n) /* put barycentric coord. vectors */ |
149 |
> |
register BARYCCM *bcm; |
150 |
> |
register FLOAT com[][3]; |
151 |
> |
int n; |
152 |
|
{ |
153 |
|
double a, b; |
154 |
|
register int i, j; |