Hi Matt,

Yes it is the OAP I am interested in. I had originally weighted the projection using the density field.

The projected velocity may look funny and it would be interesting to try to compare that to the planar. Could I also pass cyl_RadialVelocity to the OAP API?

Cheers,
John

On 16 Dec 2013 16:09, "Matthew Turk" <matthewturk@gmail.com> wrote:
Hi John,

Sorry for the delay in replying.

On Fri, Dec 13, 2013 at 8:59 AM, John Regan <johnanthonyregan@gmail.com> wrote:
> Hi All,
>
> I was trying to make an OffAxis radial projection. Naively using
>
>  proj = OffAxisProjectionPlot(pf, L, "RadialVelocityKMS", center='max',
> width=(width, 'pc'),
>                                      depth=depth)
>
> fails with a message of type
>
> yt.data_objects.field_info_container.NeedsParameter: (['center'])
>
>
> The RadialVelocity probably isn't the field to use here and requires some
> manipulation to be a quantity suitable for plotting.
>
> Any suggestions on the best way forward would be much appreciated.
>

So, a few questions.  Do you want to show the way that the radial
velocity is distributed, with respect to an image plane that isn't
axis aligned?  If you so, you might have more luck using the
OffAxisSlicePlot, which will take a slice through the domain.  The OAP
plot will integrate along the line of sight; you will probably want to
take an average if this is what you want, by supplying the weight
parameter here, as otherwise it'll just sum up the RV values at all
points.  I think the issue with it not having the parameter center is
fixable, but we should probably make sure that's what you're looking
for first.  It's also going to be doing the full 3D radial velocity,
not the planar velocity, so if your velocity is roughly spherical it
might have odd morphology in the resultant plot.

If a slice will do what you're looking for, I'd recommend the
OffAxisSlicePlot -- if you indeed do want a radial average, then I'll
take a look at passing the parameter in.  (This will also help by
enabling you to pass in the bulk velocity.)  And if you want to find
the planar RV, you'll have to use a field like cyl_RadialVelocity.

-Matt

> Cheers,
> John
>
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