That capability doesn't exist yet for interpolated=True. When that is possible, I would be +1 with moving from volume to data_source. 

On Thu, Jun 28, 2012 at 9:53 AM, Matthew Turk <matthewturk@gmail.com> wrote:
On Thu, Jun 28, 2012 at 11:51 AM, Sam Skillman <samskillman@gmail.com> wrote:
> Hi all,
>
> I think the only kwarg I'd be really +1 with getting rid of would be
> no_ghost.  interpolated=True should just trigger no_ghost=False, and
> interpolated=False doesn't use the ghost zones no matter what.  I think
> volume should stay, especially since I think it will soon be possible to do
> an off_axis_projection of a data object which would probably be fed in
> through the volume.

Why not get rid of volume and instead supply data_source, like projections?

>
> Sam
>
>
> On Thu, Jun 28, 2012 at 9:39 AM, Matthew Turk <matthewturk@gmail.com> wrote:
>>
>> Hi Elizabeth,
>>
>> I agree, this makes sense.
>>
>> Last night I tried to take a crack at this, but I got very confused
>> with the various definitions of volume, interpolated, etc etc, in the
>> routine off_axis_projection.  Cameron and Sam, do you think it would
>> be okay if we simplified this routine and relied on the
>> ProjectionCamera for advanced things, like specifying a volume?
>>
>> -Matt
>>
>> On Wed, Jun 27, 2012 at 10:53 PM, Elizabeth Tasker
>> <tasker@astro1.sci.hokudai.ac.jp> wrote:
>> > Hi,
>> >
>> > "off_axis_projection" doesn't seem to accept field parameters.
>> >
>> > This isn't a big problem and I can definitely get around it by using
>> > global variables, but should it have a field_parameter option for
>> > consistency with add_projection?
>> >
>> > Elizabeth
>> >
>> >
>> >
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