I agree with Nathan.  I filed a bug to this effect a few weeks ago demonstrating that one gets different orientations (transposes) out of the volume rendering infrastructure than out of the Projection infrastructure with the same inputs.  This is very confusing and I think should be remedied.  Good call, Matt.

On Fri, Jan 17, 2014 at 11:38 AM, John ZuHone <jzuhone@gmail.com> wrote:
On Jan 17, 2014, at 1:35 PM, Nathan Goldbaum <nathan12343@gmail.com> wrote:

To clarify further: I'd ideally like to see these two function calls produce identical plots:

ProjectionPlot(pf, 2, 'Density')
OffAxisProjectionPlot(pf, [0,0,1], 'Density')

without having to specify a north_vector by hand for the second plot.

This is my biggest reason for wanting to see this fixed. 

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Cameron Hummels
Postdoctoral Researcher
Steward Observatory
University of Arizona