29 |
|
{ |
30 |
|
FVECT delta; |
31 |
|
|
32 |
< |
delta[0] = p2[0] - p1[0]; |
33 |
< |
delta[1] = p2[1] - p1[1]; |
34 |
< |
delta[2] = p2[2] - p1[2]; |
32 |
> |
VSUB(delta, p2, p1); |
33 |
|
|
34 |
|
return(DOT(delta, delta)); |
35 |
|
} |
85 |
|
const FVECT v2 |
86 |
|
) |
87 |
|
{ |
88 |
< |
vres[0] = v1[1]*v2[2] - v1[2]*v2[1]; |
91 |
< |
vres[1] = v1[2]*v2[0] - v1[0]*v2[2]; |
92 |
< |
vres[2] = v1[0]*v2[1] - v1[1]*v2[0]; |
88 |
> |
VCROSS(vres, v1, v2); |
89 |
|
} |
90 |
|
|
91 |
|
|
97 |
|
double f |
98 |
|
) |
99 |
|
{ |
100 |
< |
vres[0] = v0[0] + f*v1[0]; |
105 |
< |
vres[1] = v0[1] + f*v1[1]; |
106 |
< |
vres[2] = v0[2] + f*v1[2]; |
100 |
> |
VSUM(vres, v0, v1, f); |
101 |
|
} |
102 |
|
|
103 |
|
|
113 |
|
if (d == 0.0) |
114 |
|
return(0.0); |
115 |
|
|
116 |
< |
if (d <= 1.0+FTINY && d >= 1.0-FTINY) { |
116 |
> |
if ((d <= 1.0+FTINY) & (d >= 1.0-FTINY)) { |
117 |
|
len = 0.5 + 0.5*d; /* first order approximation */ |
118 |
|
d = 2.0 - len; |
119 |
|
} else { |
156 |
|
|
157 |
|
void |
158 |
|
spinvector( /* rotate vector around normal */ |
159 |
< |
FVECT vres, /* returned vector */ |
159 |
> |
FVECT vres, /* returned vector (same magnitude as vorig) */ |
160 |
|
const FVECT vorig, /* original vector */ |
161 |
|
const FVECT vnorm, /* normalized vector for rotation */ |
162 |
< |
double theta /* left-hand radians */ |
162 |
> |
double theta /* right-hand radians */ |
163 |
|
) |
164 |
|
{ |
165 |
|
double sint, cost, normprod; |
174 |
|
cost = cos(theta); |
175 |
|
sint = sin(theta); |
176 |
|
normprod = DOT(vorig, vnorm)*(1.-cost); |
177 |
< |
fcross(vperp, vnorm, vorig); |
177 |
> |
VCROSS(vperp, vnorm, vorig); |
178 |
|
for (i = 0; i < 3; i++) |
179 |
|
vres[i] = vorig[i]*cost + vnorm[i]*normprod + vperp[i]*sint; |
180 |
+ |
} |
181 |
+ |
|
182 |
+ |
double |
183 |
+ |
geodesic( /* rotate vector on great circle towards target */ |
184 |
+ |
FVECT vres, /* returned vector (same magnitude as vorig) */ |
185 |
+ |
const FVECT vorig, /* original vector */ |
186 |
+ |
const FVECT vtarg, /* vector we are rotating towards */ |
187 |
+ |
double t, /* amount along arc directed towards vtarg */ |
188 |
+ |
int meas /* distance measure (radians, absolute, relative) */ |
189 |
+ |
) |
190 |
+ |
{ |
191 |
+ |
FVECT normtarg; |
192 |
+ |
double volen, dotprod, sintr, cost; |
193 |
+ |
int i; |
194 |
+ |
|
195 |
+ |
VCOPY(normtarg, vtarg); /* in case vtarg==vres */ |
196 |
+ |
if (vres != vorig) |
197 |
+ |
VCOPY(vres, vorig); |
198 |
+ |
if (t == 0.0) |
199 |
+ |
return(VLEN(vres)); /* no rotation requested */ |
200 |
+ |
if ((volen = normalize(vres)) == 0.0) |
201 |
+ |
return(0.0); |
202 |
+ |
if (normalize(normtarg) == 0.0) |
203 |
+ |
return(0.0); /* target vector is zero */ |
204 |
+ |
dotprod = DOT(vres, normtarg); |
205 |
+ |
/* check for colinear */ |
206 |
+ |
if (dotprod >= 1.0-FTINY*FTINY) { |
207 |
+ |
if (meas != GEOD_REL) |
208 |
+ |
return(0.0); |
209 |
+ |
vres[0] *= volen; vres[1] *= volen; vres[2] *= volen; |
210 |
+ |
return(volen); |
211 |
+ |
} |
212 |
+ |
if (dotprod <= -1.0+FTINY*FTINY) |
213 |
+ |
return(0.0); |
214 |
+ |
if (meas == GEOD_ABS) |
215 |
+ |
t /= volen; |
216 |
+ |
else if (meas == GEOD_REL) |
217 |
+ |
t *= acos(dotprod); |
218 |
+ |
cost = cos(t); |
219 |
+ |
sintr = sin(t) / sqrt(1. - dotprod*dotprod); |
220 |
+ |
for (i = 0; i < 3; i++) |
221 |
+ |
vres[i] = volen*( cost*vres[i] + |
222 |
+ |
sintr*(normtarg[i] - dotprod*vres[i]) ); |
223 |
+ |
|
224 |
+ |
return(volen); /* return vector length */ |
225 |
|
} |