Hi Matthew,

thanks for your prompt response!

I tried the covering_grid first but as I said we had problems with a
lot of zero-valued grid points. It seems the values from the coarser
grid are not duplicated downwards?
I tried to post a MWE to illustrate what I mean: http://pastebin.com/yishxbjW

For the arbitrary_grid: It says it cannot deal with fluid variables?

Best,
Max

On 2 October 2015 at 16:44, Matthew Turk <matthewturk@gmail.com> wrote:
> Hi Max,
>
> Ah, I think I see the problem.  If you're doing any type of particle
> deposition, including smoothing, you might be better suited to using
> the arbitrary_grid or the covering_grid objects, as
> smoothed_covering_grid is designed for situations where values need to
> be interpolated through a cascade of refinements.  It'd probably end
> up being faster to use either arbitrary_grid or covering_grid, too.
> Can you try that and let us know if it meets your needs?
>
> -Matt
>
> On Fri, Oct 2, 2015 at 9:42 AM, Max Grönke <max.gronke@astro.uio.no> wrote:
>> Hi everybody!
>>
>> I followed loosely the example provided here
>> http://yt-project.org/docs/dev/examining/low_level_inspection.html#examining-grid-data-in-a-fixed-resolution-array
>> but encountered an error message using a smoothed covering grid with
>> SPH data instead of a covering grid. I posted an MWE here:
>> http://pastebin.com/2sStpLmw which leads to the error message
>> "AttributeError: 'YTSmoothedCoveringGrid' object has no attribute
>> '_pdata_source' "
>>
>> I wanted to use a smoothed covering grid because I found that using
>> SPH data a lot of "holes" are in `covering grid' (but not, e.g., in a
>> slice plot). So I assumed there is some problem in duplicating the
>> values from the coarser grids?
>>
>> My yt version is 3.2-dev.
>>
>> Thanks a lot for your time & help,
>> Max
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