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icon5.gif  GEANE extrpolate to point of closest approach [message #6345] Thu, 10 April 2008 15:42 Go to previous message
Anonymous Poster From: *visi.ucl.ac.uk
Hi GEANE experts,

I am interested in extrapolations to points of closest approach to arbitrary space points. I am very new to using GEANE, so a detailed answer (a.k.a. GEANE for dummies) would be very helpful Wink

I can see that there are methods like

Bool_t SetWire(TVector3 extremity1, TVector3 extremity2);
Bool_t SetPoint(TVector3 pnt);
Bool_t PropagateToPCA(Int_t pca);
int FindPCA(Int_t pca, Int_t PDGCode, TVector3 point, TVector3 wire1, TVector3 wire2, Double_t maxdistance, Double_t &Ra
d, TVector3 &vpf, TVector3 &vwi, Double_t &Di, Float_t &trklength);
TVector3 GetPCAOnWire() { return vwi; }
TVector3 GetPCAOnTrack() { return vpf; }
Float_t GetLengthAtPCA() { return trklength; }
Bool_t PropagateToVirtualPlaneAtPCA(Int_t pca);
Bool_t BackTrackToVertex();
Bool_t BackTrackToVirtualPlaneAtPCA(Int_t pca);


So, I guess that some combination of these will be my answer. An example code I would need would have this as an input:


TVector3 mySpacePoint(x0,y0,z0);


And the output:
TVector3
pointInPOCAPlane
vectorPerp1ToTrackInPOCA
vectorPerp2ToTrackInPOCA

or
TVector3
pointInPOCAPlane
vectorInTrackDirectionInPOCA


Thanks you very much in advance!!

Bye, Christian

 
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