[yt-users] cut region vs. projection?

[David Collins]

That's pretty slick, I'll use that!  And that's consistent with my current
needs, since I need both projections and analysis of those regions.

Thanks,
d.


On Wed, Apr 24, 2013 at 2:02 PM, Britton Smith <brittonsmith at gmail.com>wrote:

> Hi Dave,
>
> One last followup here.  You should be able to also create your cut region
> as you described in your original post, and then use the "source" keyword
> in the projection call.
> proj = pf.h.proj(0,"Density",source=cut_region)
>
> This way is more versatile, since you can do profiling and derived
> quantities (and eventually rendering) for cut regions, whereas the
> field_cuts method only applies to projections.  Because of this, field_cuts
> will probably be phased out at some point.
>
> Britton
>
>
> On Tue, Apr 23, 2013 at 11:13 AM, David Collins <dcollins at physics.ucsd.edu
> > wrote:
>
>> Perfect, thanks, Britton!
>>
>> d.
>>
>>
>> On Mon, Apr 22, 2013 at 6:20 PM, Britton Smith <brittonsmith at gmail.com>wrote:
>>
>>> Hi Dave,
>>>
>>> You can use the field_cuts keyword for just such a thing.  You can
>>> supply multiple strings to be eval'ed in a list.  For example,
>>>
>>> proj = pf.h.proj(0, 'Density', field_cuts=['grid["Density"] > 0.1',
>>> 'grid["Density"] < 0.2'])
>>>
>>> Of course, you could also use one long string connected with ands.  This
>>> may not be documented, but certainly should be.
>>>
>>> Britton
>>>
>>>
>>> On Mon, Apr 22, 2013 at 6:00 PM, David Collins <dcollins4096 at gmail.com>wrote:
>>>
>>>> Hi, all--
>>>>
>>>> Can I hand a cut_region to a projection?
>>>>
>>>> I want to make a bunch of projections based on parameters, and don't
>>>> want to have to instantiate 47 different fields.  I'm hoping something like
>>>>
>>>> region = pf.h.all_data().cut_region('grid["Density"] > 0.1 and
>>>> grid["Density"] < 0.2')
>>>> proj = pf.h.proj(0,"Density",region=cut_region)
>>>>
>>>> or something like that.  Is that possible?  I'm poking around the help
>>>> and source, but no method immediately popped out at me.
>>>>
>>>> Thanks,
>>>> d.
>>>>
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>>>
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>>
>>
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