[yt-dev] Matching points to grids

[Matthew Turk]

Hi John,

I think that would work fine for Enzo, we'd just need to iterate over
root grids.

-Matt

On Fri, Nov 16, 2012 at 2:28 PM, John ZuHone <jzuhone at gmail.com> wrote:
> Hi Matt,
>
> Would it work just to start at the top-level grids and then work down the tree, checking the children as you go? I know this would work for FLASH, but I'm not certain it would work for Enzo.
>
> John
>
> On Nov 16, 2012, at 2:14 PM, Matthew Turk <matthewturk at gmail.com> wrote:
>
>> Hi John,
>>
>> That's the ideal way, but we don't yet have the code to do that.  I
>> would like to do that.  The fastest method would be to create a new
>> version of find_values_at_points (which accepts an array) and make itj
>> ust return grid indices.  This would do the NxM collision check of
>> particles in grids.
>>
>> Writing an octree-aware particle finder would be a good idea.
>> Necessary, even...
>>
>> -Matt
>>
>> On Fri, Nov 16, 2012 at 1:07 PM, John ZuHone <jzuhone at gmail.com> wrote:
>>> I did know about that, but given, say, a million points, would that be
>>> *fast*? I need to look at what it does I guess.
>>>
>>> In FLASH, what'd we'd normally do is start at the top level and traverse
>>> down the octree until we found the block.
>>>
>>> On Nov 16, 2012, at 1:02 PM, Nathan Goldbaum <nathan12343 at gmail.com> wrote:
>>>
>>> Hi John,
>>>
>>> Yes, you can use pf.h.find_point() to do that.  There's some documentation
>>> on it here:
>>> http://yt-project.org/doc/analyzing/low_level_inspection.html#finding-data-at-fixed-points
>>>
>>> -Nathan
>>>
>>> On Nov 16, 2012, at 10:00 AM, John ZuHone wrote:
>>>
>>> Hi all,
>>>
>>> Do we have anything in yt right now that, given a set of points, *quickly*
>>> finds out which grids they belong to?
>>>
>>> Best,
>>>
>>> John Z
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