[ROOT] TNode::IsIn(x,y,z) and TNode::DistanceToEdge(x,y,z)

From: Christian Holm Christensen (cholm@hehi03.nbi.dk)
Date: Tue Jan 16 2001 - 20:43:43 MET 

Hi ROOT'ers, 

Given a TGeometry and three spatial cordinates (x,y,z), is
there anyway to determind in which TNode that point is inside? 
(a la GEANT's GMEDIA)

And given a TNode and spatial coordinates, is it possible to find the
distance to the closest edge of that TNode?  

Also given a TNode, spatial coordinates and a direction (vx, vy, vz)
is it possible to find the distance to the next node boundary? 
(a la GEANT's GNEXT) 

Have I just overlooked something? Or isn't there? If it isn't I'd like
to suggest having something like:

   TNode* TGeometry::FindNode(Double_t x, Double_t y, Double_t z);
   Double_t TNode::DistanceToEdge(Double_t x, Double_t y, Double_t z);
   Double_t TNode::DistanceToEdge(Double_t x,  Double_t y,  Double_t z, 
				  Double_t vx, Double_t vy, Double_t vz);


Am I rigth in believing that g2root doens't support devisions of
volumes? And will the TNodeDiv class be implemented? 

Also, has any one tried to have a GEANT geometry in a MySQL database
and use the same database for offline analysis in ROOT? If so, I'd
like to see how you did it.

Thanks. 

Yours, 

Christian  -----------------------------------------------------------
Holm Christensen                             Phone:  (+45) 35 35 96 91 
  Sankt Hansgade 23, 1. th.                  Office: (+45) 353  25 305 
  DK-2200 Copenhagen N                       Web:    www.nbi.dk/~cholm    
  Denmark                                    Email:       cholm@nbi.dk

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