The attached scripts use the afw.cameraGeom.Camera provided by obs.lsstSim.LsstSimMapper as well as a camera generated directly from the description/focalplanelayout.txt and description/focalplanelayout.txt from obs_LsstSim to generate pixel coordinates from a catalog of stars. These ought to return identical pixel coordinates. They do not.
If you run cameraTest.py you will get a catalog that lists the pixel coordinates in the control camera (the camera provided by LsstSimMapper), the pixel coordinates in the test camera, and the difference between the two.
Note: the scripts use CatSim code, so sims_catUtils will need to be set up.
Instructions for accessing the CatSim databases are here