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Archived Messages for CLAS_DRIFT_CHAMBERS_1997@cebaf.gov: Re: coordinate systems in the trk code

Re: coordinate systems in the trk code

James A. Mueller (mueller@blakey.phyast.pitt.edu)
Mon, 07 Jul 1997 11:35:39 -0400 (EDT)

Liming,
I was about to make the changes to trk_fill_hbtr.F and trk_fill_tbtr.F
and sda_rotds.F friday night, when I saw that you had just altered the first
two. After verifying that your code had the same logical change as mine, for
those, I committed my revised version of sda_rotds.F. And you are right. The
direction cosines were rotated correctly, but the vertex positions were
only correct if you were in sector 1(?). This was the reason, so many
tracks look funny in ced. Any track with a vertex displaced from (0,0,0)
was not being plotted properly.

-Jim Mueller