Getting orthogonal vector using XYZVector

[Javier_Galan]

Also I am having issues finding a replacement for TVector3::Rotate( Double_t angle, TVector3 axis ) which rotates a given vector by a given angle around a given axis.

I was having a look at the following post that didn’t clarify much

Rotating vectors with ROOT::Math::XYZVector

When trying to convert code originally written for Geant4, I came across the following lines: G4ThreeVector v(m_Distance*sinTheta*cos(phi), m_Distance*sinTheta*sin(phi), m_Distance*cosTheta); v.rotateUz(-m_CenterDirection); I’m converting this code to run in ROOT. My first inclination was to use TVector3D, since it also has a rotateUz method like G4ThreeVector (which is a CLHEP::Hep3Vector). But at the top of the TVector3D page, it states: TVector3 is a l…