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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)
Date: 17 Sep, 2018
From: Evgueni Tcherniaev <Evgueni Tcherniaev>

 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 ```

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1 Re: Has anyone tried rotate(angle,axis)?   (Huagang Yan - 18 Sep, 2018)
 to: "Re: Has anyone tried rotate(angle,axis)?"
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