54 |
|
/* get face arguments */ |
55 |
|
f = getface(o); |
56 |
|
if (f->area == 0.0) /* empty face */ |
57 |
< |
return(0); |
57 |
> |
return(O_MISS); |
58 |
|
/* compute cube boundaries */ |
59 |
|
for (j = 0; j < 3; j++) |
60 |
|
cumax[j] = (cumin[j] = cu->cuorg[j]) + cu->cusize; |
64 |
|
if (j = plocate(VERTEX(f,i), cumin, cumax)) |
65 |
|
vloc &= j; |
66 |
|
else |
67 |
< |
return(1); /* vertex inside */ |
67 |
> |
return(O_HIT); /* vertex inside */ |
68 |
|
|
69 |
|
if (vloc) /* all to one side */ |
70 |
< |
return(0); |
70 |
> |
return(O_MISS); |
71 |
|
|
72 |
|
for (i = 0; i < f->nv; i++) { /* check edges */ |
73 |
|
if ((j = i + 1) >= f->nv) |
75 |
|
VCOPY(v1, VERTEX(f,i)); /* clip modifies */ |
76 |
|
VCOPY(v2, VERTEX(f,j)); /* the vertices! */ |
77 |
|
if (clip(v1, v2, cumin, cumax)) |
78 |
< |
return(1); /* edge inside */ |
78 |
> |
return(O_HIT); /* edge inside */ |
79 |
|
} |
80 |
|
/* see if cube cuts plane */ |
81 |
|
for (j = 0; j < 3; j++) |
86 |
|
v1[j] = cumax[j]; |
87 |
|
v2[j] = cumin[j]; |
88 |
|
} |
89 |
< |
if ((d1 = DOT(v1, f->norm) - f->const) > FTINY) |
90 |
< |
return(0); |
91 |
< |
if ((d2 = DOT(v2, f->norm) - f->const) < -FTINY) |
92 |
< |
return(0); |
89 |
> |
if ((d1 = DOT(v1, f->norm) - f->offset) > FTINY) |
90 |
> |
return(O_MISS); |
91 |
> |
if ((d2 = DOT(v2, f->norm) - f->offset) < -FTINY) |
92 |
> |
return(O_MISS); |
93 |
|
/* intersect face */ |
94 |
|
for (j = 0; j < 3; j++) |
95 |
|
v1[j] = (v1[j]*d2 - v2[j]*d1)/(d2 - d1); |
96 |
|
if (inface(v1, f)) |
97 |
< |
return(1); |
97 |
> |
return(O_HIT); |
98 |
|
|
99 |
< |
return(0); /* no intersection */ |
99 |
> |
return(O_MISS); /* no intersection */ |
100 |
|
} |