[Halld-offline] Fwd: r10030 - in trunk/sim-recon/src/programs/Utilities: . hd_geom_query

[Richard Jones]

Dave,

It runs inside interactive geant3.  If you can't build geant3, you can't run it.  I suppose that rules out the iphone and the ipad as well.  Not sure if anyone has ported cernlib to android?

A tool that runs on top of geant has the additional advantage that you are asking geant what it thinks is at a given location, not what a third party may think the geometry description is saying is there.  In the case of overlapping volumes, it tells who wins in geant tracking.  That can depend on the direction from which you enter, which is why I wrote it.  You can click a couple of points leading up to a volume and then watch if it properly transitions into the next volume when you cross the boundary.

Like I said, you can also just type in the coordinates.  But then which direction you are coming from may be lost.  In an ideal world there are no overlapping volumes, but there are times that this can be the only efficient way to code a given geometry.  You have to know what you are doing, and have a tool like this to verify that you did it right.

-Richard J.


On 11/30/2012 11:58 AM, David Lawrence wrote:
>
> Does it work on Mac where CERNLIB is not available?
>
> -Dave
>

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