Hi Bili, At least some data sets seem to need the bounds specified -- I *think* this is to obviate a potentially bad guess as to the bounds of the particles, but I could be wrong about this. I'll try to have a look into the source tomorrow. -d On Tue, Jul 21, 2015 at 3:48 PM, Bili Dong wrote:

Thanks Desika!

I’m experimenting on it. Seems that if I don’t specify bounding box, yt will try to guess it from the header information, which is exactly what I expected to specify. That’s so impressive!

I’m still wondering what the point is in specifying a larger bounding box as in the case of the cook book example. Is it just an example to show the functionality or am I missing something?

Regards, Bili

On Jul 21, 2015, at 12:04 PM, Desika Narayanan wrote:

no problem. note - you might need to set a bounding box on the load command similar to this cook book example.

http://yt-project.org/doc/cookbook/gadget_notebook.html

On Tue, Jul 21, 2015 at 2:42 PM, Bili Dong wrote:

...

Hi Desika,

Thanks for your help!

Regards, Bili

...

On Jul 20, 2015, at 7:19 PM, Desika Narayanan wrote:

Hi Bili, 1 . I wrote an example script that does some of the things you want in question 1 here

http://paste.yt-project.org/show/5727/

2. When you load the octree, you can change the threshold number of particles necessary for refinment by :

ds = load(filename, n_ref = 32)

Not sure about 3 or 4, but I think the answer is that the kernel is hardcoded in.

-d

On Mon, Jul 20, 2015 at 4:56 PM, Bili Dong wrote:

...

Hi yt users,

Recently I started using yt to analyze a Gadget-like data (one of the main difference being a different kernel function). I?ve got several questions about the fields depostion mechanism:

1. How do I get the information of the underlying mesh onto which the fields are deposited? 2. Can I specify the properties of the underlying mesh? If so, how? 3. Can I customize the smoothing process, like using a different smoothing kernel? 4. I?m looking into the file yt/geometry/particle_smooth.pyx to learn the implementation details of the smoothing process. But for me, the code is not easy to read. So I?m wondering if there are further documentations I could refer to? (The only relevant doc I find for now is this one < http://yt-project.org/docs/dev/analyzing/fields.html#general-particle-fields

...

)

I?m new to yt, so these questions might be dumb. Sorry for wasting your time if that?s the case.

Thanks, Bili

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