question: public boolean epsilonEquals ( Vector3 obj , float epsilon ) { if ( obj == null ) return false ; if ( Math . abs ( obj . x - x ) > epsilon ) return false ; if ( Math . abs ( obj . y - y ) > epsilon ) return false ; if ( Math . abs ( obj . z - z ) > epsilon ) return false ; return true ; }
target:  Compares this vector with the other vector, using the supplied epsilon for fuzzy equality testing.