83 |
|
} |
84 |
|
|
85 |
|
|
86 |
+ |
fvsum(vres, v0, v1, f) /* vres = v0 + f*v1 */ |
87 |
+ |
FVECT vres, v0, v1; |
88 |
+ |
double f; |
89 |
+ |
{ |
90 |
+ |
vres[0] = v0[0] + f*v1[0]; |
91 |
+ |
vres[1] = v0[1] + f*v1[1]; |
92 |
+ |
vres[2] = v0[2] + f*v1[2]; |
93 |
+ |
} |
94 |
+ |
|
95 |
+ |
|
96 |
|
double |
97 |
|
normalize(v) /* normalize a vector, return old magnitude */ |
98 |
|
register FVECT v; |
101 |
|
|
102 |
|
len = DOT(v, v); |
103 |
|
|
104 |
< |
if (len <= FTINY*FTINY) |
104 |
> |
if (len <= 0.0) |
105 |
|
return(0.0); |
106 |
|
|
107 |
+ |
/****** problematic |
108 |
|
if (len >= (1.0-FTINY)*(1.0-FTINY) && |
109 |
|
len <= (1.0+FTINY)*(1.0+FTINY)) |
110 |
|
return(1.0); |
111 |
+ |
******/ |
112 |
|
|
113 |
|
len = sqrt(len); |
114 |
|
v[0] /= len; |