32 |
|
|
33 |
|
|
34 |
|
FACE * |
35 |
< |
getface(o) /* get arguments for a face */ |
36 |
< |
OBJREC *o; |
35 |
> |
getface( /* get arguments for a face */ |
36 |
> |
OBJREC *o |
37 |
> |
) |
38 |
|
{ |
39 |
|
double d1; |
40 |
< |
int badvert; |
40 |
> |
int smalloff, badvert; |
41 |
|
FVECT v1, v2, v3; |
42 |
< |
register FACE *f; |
43 |
< |
register int i; |
42 |
> |
FACE *f; |
43 |
> |
int i; |
44 |
|
|
45 |
|
if ((f = (FACE *)o->os) != NULL) |
46 |
|
return(f); /* already done */ |
85 |
|
/* compute offset */ |
86 |
|
badvert = 0; |
87 |
|
f->offset = DOT(f->norm, VERTEX(f,0)); |
88 |
+ |
smalloff = fabs(f->offset) <= VERTEPS; |
89 |
|
for (i = 1; i < f->nv; i++) { |
90 |
|
d1 = DOT(f->norm, VERTEX(f,i)); |
91 |
< |
badvert += fabs(1.0 - d1*i/f->offset) > VERTEPS; |
91 |
> |
if (smalloff) |
92 |
> |
badvert += fabs(d1 - f->offset/i) > VERTEPS; |
93 |
> |
else |
94 |
> |
badvert += fabs(1.0 - d1*i/f->offset) > VERTEPS; |
95 |
|
f->offset += d1; |
96 |
|
} |
97 |
|
f->offset /= (double)f->nv; |
107 |
|
|
108 |
|
|
109 |
|
void |
110 |
< |
freeface(o) /* free memory associated with face */ |
111 |
< |
OBJREC *o; |
110 |
> |
freeface( /* free memory associated with face */ |
111 |
> |
OBJREC *o |
112 |
> |
) |
113 |
|
{ |
114 |
|
if (o->os == NULL) |
115 |
|
return; |
119 |
|
|
120 |
|
|
121 |
|
int |
122 |
< |
inface(p, f) /* determine if point is in face */ |
123 |
< |
FVECT p; |
124 |
< |
FACE *f; |
122 |
> |
inface( /* determine if point is in face */ |
123 |
> |
FVECT p, |
124 |
> |
FACE *f |
125 |
> |
) |
126 |
|
{ |
127 |
|
int ncross, n; |
128 |
|
double x, y; |
129 |
|
int tst; |
130 |
< |
register int xi, yi; |
131 |
< |
register FLOAT *p0, *p1; |
130 |
> |
int xi, yi; |
131 |
> |
RREAL *p0, *p1; |
132 |
|
|
133 |
< |
xi = (f->ax+1)%3; |
134 |
< |
yi = (f->ax+2)%3; |
133 |
> |
if ((xi = f->ax + 1) >= 3) xi -= 3; |
134 |
> |
if ((yi = xi + 1) >= 3) yi -= 3; |
135 |
|
x = p[xi]; |
136 |
|
y = p[yi]; |
137 |
|
n = f->nv; |