I added the XRay Image query to visit. It creates an x ray image from
by casting rays through the data set using an absortivity and emisivity.
The absorbtivity and emisivity can be array variables in which case you
will get one image per array element.  I still have some more work to
complete but this is a good starting point. I still need to implement
the cylindrical case and I will likely make some performance improvements.

The XRay Image query takes the following arguments:

output type, divide, x, y, z, radius, theta, phi, width, height,
nx, ny, absvar, emisvar

Here is a sample query:

Query("XRay Image", "png", 1, 0.0, 2.5, 10.0, 0, 0, 10., 10., 400, 400,
      ("d", "p"))



git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@11844 18c085ea-50e0-402c-830e-de6fd14e8384