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Finding the subdetector positions [message #362] Mon, 03 October 2005 17:42 Go to previous message
Messages: 7
Registered: October 2005
Location: SLAC

I'm writing some clustering code for the calorimeters. I'd like to be able to extract geometrical information. The first bit is this:

(1) Which subdetector, if any, is point (x,y,z) inside?

That will get me some way, but eventually I will also need to know things like:

(2a) What are the boundaries of the calorimeter subsystems, and
(2b) What are the intercepts of a trajectory with those subsystems?

Given (2a) and our reasonably simple geometry (concentric cylinders lined up on the z-axis), I can get to (2b) fairly easily.

I'm really not sure where to start with this. In a Driver I have access to the EventHeader, from which I can get to the Detector and the IDDecoder, but I can't see how to go further with those. I think I'm missing something obvious -- any suggestions?


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