// l=r^(-1)*(w)*r
public void WtoL_V(ref RPoint WP, out RPoint LP)
{
QPoint Q = new QPoint(WP, 0.0);
Q.RMul(ref m_R);
Q.LDiv(ref m_R);
LP = Q.PT;
}
// res=this'; L=this(res(L))=res(this(L))
public CTrans MakeInverse()
{
QPoint QT = new QPoint(RPoint.Zero - this.T, 0);
QT.RMul(ref this.m_R);
QT.LDiv(ref this.m_R);
CTrans res = new CTrans(QT.PT, this.m_R);
res.m_R.Conj();
return(res);
}