sPHENIX tracking discussion

[pinkenburg <pinkenburg AT bnl.gov>]

    Hi Tony,
    
    the build problem is a red hering, it's not related to this. But in
    terms of storing this long term on a DST - using some Eigen
    construct exposes us to the same potential problem - relying on
    Eigen to never change it.
    
    Chris

On 10/19/2022 8:52 PM, Anthony Frawley wrote:

        Hello Chris,
      
        
      
      
        The class stores Acts::Transform3 objects. Acts::Transform3 is
        just a pseudonym for an Eigen::Transform3D, so we could switch
        to declaring it that way - I believe the compiler should be
        happy with that. The reason that it needs to be created before
        the Acts geometry is that it contains the static variable that
        tells Acts whether it should return the detector construction
        transforms from the detector element base class, or the
        transforms we make that contain alignment perturbations.
        
      
      
        
      
      
        I assume that you are OK with using an Eigen class? If so, I can
        easily change it.
      
      
        
      
      
        The static variable is used to control whether we get alignment
        transformations or construction transformations from the Acts
        GeometryContext. Whenever we want to switch to new alignment
        transforms, we need to switch temporarily to construction
        transforms, which are used as the baseline for the alignment
        transformations. We will have to change the alignment transforms
        periodically, presumably.
      
      
        
      
      
        The static variable just needs to be somewhere that we can set
        it before we build the Acts geometry, and then access it
        conveniently. I don't care where it is.
      
      
        
      
      
        Tony

---

From: sPHENIX-tracking-l <sphenix-tracking-l-bounces AT lists.bnl.gov> on behalf of pinkenburg via sPHENIX-tracking-l <sphenix-tracking-l AT lists.bnl.gov>
Sent: Wednesday, October 19, 2022 5:23 PM
To: sphenix-tracking <sphenix-tracking-l AT lists.bnl.gov>
Subject: [Sphenix-tracking-l] trackbase/alignmentTranformationContainer

 

Hi folks,

this class throws a monkey wrench into the build (with gcc 12.1). It can
be dealt with but the problem is that it is a persitant class which
contains a variable from Acts:
   std::vector< std::vector<Acts::Transform3>> transformVec;

We don't want to expose our DST readback to the whims of other software.
It also has a static variable which doesn't really makes sense in a
persistent object. Can this be split into a persistent part and some
helper which fills it? If it doesn't pull in Acts (when rootcint is
run), the build problem will go away as well. I am surprised that this
doesn't crash our regular builds - given what I see it should (it pulls
in an Acts include before Acts installs it)

Chris


--
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Christopher H. Pinkenburg       ;    pinkenburg AT bnl.gov
                                ;    https://urldefense.com/v3/__http://www.phenix.bnl.gov/*pinkenbu__;fg!!PhOWcWs!z_91XYat_bFWu1cT-GOnhA1YEDUrbYBo_4WimStvv7XA8SaCKWrXDjRb3BQbDISkh3Wl9SepSleyTveOJtx_W2RJjeqpdy5WTw$ 

Brookhaven National Laboratory  ;    phone: (631) 344-5692
Physics Department Bldg 510 C   ;    fax:   (631) 344-3253
Upton, NY 11973-5000

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-- 
*************************************************************

Christopher H. Pinkenburg	;    pinkenburg AT bnl.gov
				;    http://www.phenix.bnl.gov/~pinkenbu

Brookhaven National Laboratory	;    phone: (631) 344-5692
Physics Department Bldg 510 C	;    fax:   (631) 344-3253
Upton, NY 11973-5000

*************************************************************