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Re: GEANE: Propagate to Plane not implemented [message #7414 is a reply to message #7413] Wed, 15 October 2008 10:42 Go to previous messageGo to previous message
Lia Lavezzi
Messages: 291
Registered: May 2007
Location: Torino
first-grade participant

From: *pv.infn.it
Hi Tobias,
I think the cross product is correct, since in the PropagateToPlane(TVector3 &v0, TVector3 &v1, TVector3 &v2) you give as input the three vectors o, u and v.

They will be given to the EUFILP routine, which says to GEANE to "propagate to plane" in the Propagate(CbmTrackParP *TStart, CbmTrackParP *TEnd, Int_t PDG) function (as Mohammad said).

To do this a vector is filled Float_t plo[12], in this way:

TVector3 v1u=v1.Unit();
TVector3 v2u=v2.Unit();

// first vector on plane
plo[0]=v1u.X(); 
plo[1]=v1u.Y();
plo[2]=v1u.Z();
// second vector on plane
plo[3]=v2u.X();
plo[4]=v2u.Y();
plo[5]=v2u.Z();
// origin of the plane 
plo[6]=v0.X();
plo[7]=v0.Y();
plo[8]=v0.Z();

// normal to the plane (the third vector to define the reference system u, v, w)
TVector3 v3=v1u.Cross(v2u); 
plo[9]=v3(0);
plo[10]=v3(1);
plo[11]=v3(2);


So what did you exactly change?

Ciao,
Lia.
 
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