| 1 |
– |
/* Copyright (c) 1995 Regents of the University of California */ |
| 2 |
– |
|
| 1 |
|
#ifndef lint |
| 2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
| 2 |
> |
static const char RCSid[] = "$Id$"; |
| 3 |
|
#endif |
| 6 |
– |
|
| 4 |
|
/* |
| 5 |
|
* face.c - routines dealing with polygonal faces. |
| 9 |
– |
* |
| 10 |
– |
* 8/30/85 |
| 6 |
|
*/ |
| 7 |
|
|
| 8 |
+ |
#include "copyright.h" |
| 9 |
+ |
|
| 10 |
|
#include "standard.h" |
| 11 |
|
|
| 12 |
|
#include "object.h" |
| 25 |
|
*/ |
| 26 |
|
|
| 27 |
|
#ifdef SMLFLT |
| 28 |
< |
#define VERTEPS 1e-2 /* allowed vertex error */ |
| 28 |
> |
#define VERTEPS 1e-3 /* allowed vertex error */ |
| 29 |
|
#else |
| 30 |
< |
#define VERTEPS 1e-4 /* allowed vertex error */ |
| 30 |
> |
#define VERTEPS 1e-5 /* allowed vertex error */ |
| 31 |
|
#endif |
| 32 |
|
|
| 33 |
|
|
| 36 |
|
OBJREC *o; |
| 37 |
|
{ |
| 38 |
|
double d1; |
| 39 |
< |
int badvert; |
| 39 |
> |
int smalloff, badvert; |
| 40 |
|
FVECT v1, v2, v3; |
| 41 |
|
register FACE *f; |
| 42 |
|
register int i; |
| 84 |
|
/* compute offset */ |
| 85 |
|
badvert = 0; |
| 86 |
|
f->offset = DOT(f->norm, VERTEX(f,0)); |
| 87 |
+ |
smalloff = fabs(f->offset) <= VERTEPS; |
| 88 |
|
for (i = 1; i < f->nv; i++) { |
| 89 |
|
d1 = DOT(f->norm, VERTEX(f,i)); |
| 90 |
< |
badvert += fabs(d1 - f->offset/i) > VERTEPS; |
| 90 |
> |
if (smalloff) |
| 91 |
> |
badvert += fabs(d1 - f->offset/i) > VERTEPS; |
| 92 |
> |
else |
| 93 |
> |
badvert += fabs(1.0 - d1*i/f->offset) > VERTEPS; |
| 94 |
|
f->offset += d1; |
| 95 |
|
} |
| 96 |
|
f->offset /= (double)f->nv; |
| 97 |
< |
if (badvert) |
| 97 |
> |
if (f->nv > 3 && badvert) |
| 98 |
|
objerror(o, WARNING, "non-planar vertex"); |
| 99 |
|
/* find axis */ |
| 100 |
|
f->ax = fabs(f->norm[0]) > fabs(f->norm[1]) ? 0 : 1; |
| 105 |
|
} |
| 106 |
|
|
| 107 |
|
|
| 108 |
+ |
void |
| 109 |
|
freeface(o) /* free memory associated with face */ |
| 110 |
|
OBJREC *o; |
| 111 |
|
{ |
| 116 |
|
} |
| 117 |
|
|
| 118 |
|
|
| 119 |
+ |
int |
| 120 |
|
inface(p, f) /* determine if point is in face */ |
| 121 |
|
FVECT p; |
| 122 |
|
FACE *f; |
| 123 |
|
{ |
| 124 |
|
int ncross, n; |
| 125 |
|
double x, y; |
| 126 |
+ |
int tst; |
| 127 |
|
register int xi, yi; |
| 128 |
< |
register FLOAT *p0, *p1; |
| 128 |
> |
register RREAL *p0, *p1; |
| 129 |
|
|
| 130 |
< |
xi = (f->ax+1)%3; |
| 131 |
< |
yi = (f->ax+2)%3; |
| 130 |
> |
if ((xi = f->ax + 1) >= 3) xi -= 3; |
| 131 |
> |
if ((yi = xi + 1) >= 3) yi -= 3; |
| 132 |
|
x = p[xi]; |
| 133 |
|
y = p[yi]; |
| 134 |
|
n = f->nv; |
| 137 |
|
ncross = 0; |
| 138 |
|
/* positive x axis cross test */ |
| 139 |
|
while (n--) { |
| 140 |
< |
if ((p0[yi] > y) ^ (p1[yi] > y)) |
| 141 |
< |
if (p0[xi] > x && p1[xi] > x) |
| 140 |
> |
if ((p0[yi] > y) ^ (p1[yi] > y)) { |
| 141 |
> |
tst = (p0[xi] > x) + (p1[xi] > x); |
| 142 |
> |
if (tst == 2) |
| 143 |
|
ncross++; |
| 144 |
< |
else if (p0[xi] > x || p1[xi] > x) |
| 144 |
> |
else if (tst) |
| 145 |
|
ncross += (p1[yi] > p0[yi]) ^ |
| 146 |
|
((p0[yi]-y)*(p1[xi]-x) > |
| 147 |
|
(p0[xi]-x)*(p1[yi]-y)); |
| 148 |
+ |
} |
| 149 |
|
p0 = p1; |
| 150 |
|
p1 += 3; |
| 151 |
|
} |