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    <br>
    Hi Mark,<br>
    <br>
        You should be able to get at it with something like:<br>
    <br>
    vector<const DMCThrown*> mcthrowns;<br>
    loop->Get(mcthrowns);<br>
    for(unsigned int i=0; i<mcthrowns->size(); i++){<br>
        DVector3 &pos = mcthrowns[i]->position();<br>
        cout << "X=" << pos.X() << "Y=" <<
    pos.Y() << "Z=" << pos.Z() << endl;<br>
    }<br>
    <br>
    Regards,<br>
    -Dave<br>
    <br>
    On 10/7/10 9:08 AM, Mark M. Ito wrote:
    <blockquote cite="mid:4CADC664.2000602@jlab.org" type="cite">
      <pre wrap="">  Folks,

General question:

I have an hdgeant-generated event with a single particle. Here is 
snippet of the hddm:

<physicsEvent eventNo="1" runNo="1">
<reaction type="0" weight="0">
<vertex>
<product decayVertex="0" id="1" mech="0" parentid="0" pdgtype="0" 
type="pi+">
<momentum E="0" px="0" py="0" pz="100" />
</product>
<origin t="0" vx="-100" vy="-100" vz="170" />
</vertex>
</reaction>

How do I get access to the position of the vertex, i. e., (vx, vy, vz) 
where "v" stands for vertex, from within JANA?

   -- Mark


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</pre>
    </blockquote>
    <br>
    <div class="moz-signature">-- <br>
      <img src="cid:part1.04070902.08060104@jlab.org" border="0"></div>
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