[yt-dev] Data access along streamlines in yt 3.x

[Will Barnes]

Hi Matt,

Thanks for getting back to me so quickly. I’ve been pretty happy with the yt streamlines interface and being able to access fields of a dataset on given streamline would be especially useful for a project I’m currently working on. I would be happy to contribute though I’ll admit I do not have any experience working with cython (which I see yt/geometry/selecttion_routines.pyx is written in). 

I’d be happy to drop into the slack channel tomorrow to discuss this further. Clicking on the slack link at http://yt-project.org/community.html <http://yt-project.org/community.html>, it looks like I need an invite to join the chat. 

Thanks again!

Will

> On Aug 2, 2016, at 1:56 PM, Matthew Turk <matthewturk at gmail.com> wrote:
> 
> Hi Will,
> 
> Thanks for your email!  I just checked, and indeed, that you can't access them.  But, I don't think it would be terribly difficult (although likely a bit baroque) to implement the access protocol, and I think it would be a great addition.  I think that it would require implementing a streamline data selector in yt/geometry/selection_routines.pyx.  The streamline path object itself has a positions attribute, which gives the position at each point in the streamline.  This can be accessed in the selection routine in an implementation of select_cell.
> 
> I'd be haappy to work through this with you, if you'd like -- you can join our slack channel (it should currently allow guests, or we can invite you) and we can talk through this if you'd like.
> 
> -Matt
> 
> On Tue, Aug 2, 2016 at 11:40 AM, Will Barnes <wtb2 at rice.edu <mailto:wtb2 at rice.edu>> wrote:
> Hi all,
> 
> I was wondering if there is currently an effort to implement data access along streamlines in yt 3.x. The streamline documentation (http://yt-project.org/doc/visualizing/streamlines.html <http://yt-project.org/doc/visualizing/streamlines.html>) indicates that this functionality is not yet available in 3.x, but seems to imply that it was available in previous versions (possibly 2.x?). 
> 
> If no one else is working on this currently, I would be interested in contributing to this feature. However, I am relatively new to the yt codebase and don’t know what level of expertise would be needed. Any comments/feedback would be appreciated.
> 
> Thanks!
> 
> Will Barnes
> 
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