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## Re: Has anyone tried rotate(angle,axis)?

Forum: Geometry
Re: Has anyone tried rotate(angle,axis)? (Huagang Yan)
Re: Re: Has anyone tried rotate(angle,axis)? (Evgueni Tcherniaev)
Re: Re: Has anyone tried rotate(angle,axis)? (Huagang Yan)
Re: Re: Has anyone tried rotate(angle,axis)? (Evgueni Tcherniaev)
Date: 18 Sep, 2018
From: Huagang Yan <Huagang Yan>

 On Mon, 17 Sep 2018 14:10:48 GMT, Evgueni Tcherniaev wrote: ```> Dear Huagang Yan, > > To fix the issue it is sufficient just to change the order of rotations > in your code: > > G4double anglet2 = 30*degree; > testrot2->rotate(anglet2,axis); > testrot2->rotateY(45*degree); > > However, I strongly recommend you to use a constructor with > G4Transform3D (which describes a direct transformation of the object): > > G4double anglet1 = 0*degree; > testrot1->rotateY(-45*degree); > testrot1->rotate(anglet1,axis); > > G4double anglet2 = 30*degree; > testrot2->rotateY(-45*degree); > testrot2->rotate(anglet2,axis); > > G4double anglet3 = 60*degree; > testrot3->rotateY(-45*degree); > testrot3->rotate(anglet3,axis); > > G4double anglet4 = 90*degree; > testrot4->rotateY(-45*degree); > testrot4->rotate(anglet4,axis); > > G4double anglet5 = 120*degree; > testrot5->rotateY(-45*degree); > testrot5->rotate(anglet5,axis); > > G4Transform3D tra1(*testrot1, position1); > G4Transform3D tra2(*testrot2, position2); > G4Transform3D tra3(*testrot3, position3); > G4Transform3D tra4(*testrot4, position4); > G4Transform3D tra5(*testrot5, position5); > > Please note, that rotations are performed in a counterclockwise > direction, so to put the cylinder in a position perpendicular to the > axis of further rotation, you should apply rotateY(-45*degree) > > Attachment: > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/09/17/07.09-1157-transformations.jpeg > ``` Sorry for responding so late. Your method works. Thanks a lot! I should have been more mindful about the order and direction of the rotations.

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