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SGVec3.hxx: Generate any perpandicular vector to a given one.
This commit is contained in:
frohlich 2006-12-08 12:17:30 +00:00
parent 138825af6d
commit 67d837c4ec
1 changed files with 14 additions and 0 deletions
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14
simgear/math/SGVec3.hxx
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@ -364,6 +364,20 @@ cross(const SGVec3<T>& v1, const SGVec3<T>& v2)
v1(0)*v2(1) - v1(1)*v2(0));
}
/// return any vector perpandicular to v
template<typename T>
inline
SGVec3<T>
perpandicular(const SGVec3<T>& v)
{
if (fabs(v.x()) < fabs(v.y()) && fabs(v.x()) < fabs(v.z()))
return cross(SGVec3f(1, 0, 0), v);
else if (fabs(v.y()) < fabs(v.x()) && fabs(v.y()) < fabs(v.z()))
return cross(SGVec3f(0, 1, 0), v);
else
return cross(SGVec3f(0, 0, 1), v);
}
/// The euclidean norm of the vector, that is what most people call length
template<typename T>
inline