So I figured out a way to load particle fields onto AMRCoveringGridBase. I also had to tack on NumberOfParticles inside the get_data method. cic_* expects this attribute, and I couldn't figure out a better way to check for it.<div>
<br></div><div>My solution is a serious hack right now and performs a lot of extra reads, but it would be nice to support this eventually. I will stash it to a branch for now. Would anyone be interested in coming back to this and getting it into a good enough state to push back to yt/yt?</div>
<div><br></div><div>Best,</div><div>Casey</div><div><br><br><div class="gmail_quote">On Thu, Feb 23, 2012 at 7:47 PM, Casey W. Stark <span dir="ltr"><<a href="mailto:caseywstark@gmail.com">caseywstark@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Okay, that explains it. Thanks Matt.<div><br></div><div>I will try the shadow region solution tomorrow.</div><div><br>
</div>
<div>Best,</div><div>Casey</div><div class="HOEnZb"><div class="h5"><div><br><br><div class="gmail_quote">On Thu, Feb 23, 2012 at 7:26 PM, Matthew Turk <span dir="ltr"><<a href="mailto:matthewturk@gmail.com" target="_blank">matthewturk@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Casey,<br>
<div><div><br>
On Thu, Feb 23, 2012 at 10:23 PM, Casey W. Stark <<a href="mailto:caseywstark@gmail.com" target="_blank">caseywstark@gmail.com</a>> wrote:<br>
> Hi all.<br>
><br>
> I'm trying to make a covering grid of the full domain of an enzo<br>
> (cosmological) simulation, getting the dark matter density and velocity<br>
> fields. This works fine with the gas:<br>
><br>
> In [1]: cg = pf.h.covering_grid(0, [0,0,0], [256,256,256],<br>
> fields=["Density", "x-velocity", "y-velocity", "z-velocity"])<br>
><br>
> But then I try the DM fields:<br>
><br>
> In [2]: cg = pf.h.covering_grid(0, [0,0,0], [256,256,256],<br>
> fields=["Dark_Matter_Density", "cic_particle_velocity_x",<br>
> "cic_particle_velocity_y", "cic_particle_velocity_z"])<br>
><br>
> ... ipython cruft ...<br>
><br>
> /project/projectdirs/nyx/yt-installs/yt-hopper/src/yt-hg/yt/data_objects/data_containers.pyc<br>
> in __init__(self, level, left_edge, dims, fields, pf, num_ghost_zones,<br>
> use_pbar, **kwargs)<br>
> 3342 self.domain_width = na.rint((self.pf.domain_right_edge -<br>
> 3343<br>
> self.pf.domain_left_edge)/self.dds).astype('int64')<br>
> -> 3344 self._refresh_data()<br>
> 3345<br>
> 3346 def _get_list_of_grids(self, buffer = 0.0):<br>
><br>
> /project/projectdirs/nyx/yt-installs/yt-hopper/src/yt-hg/yt/data_objects/data_containers.pyc<br>
> in _refresh_data(self)<br>
> 3359<br>
> 3360 def _refresh_data(self):<br>
> -> 3361 AMR3DData._refresh_data(self)<br>
> 3362 self['dx'] = self.dds[0] * na.ones(self.ActiveDimensions,<br>
> dtype='float64')<br>
> 3363 self['dy'] = self.dds[1] * na.ones(self.ActiveDimensions,<br>
> dtype='float64')<br>
><br>
> /project/projectdirs/nyx/yt-installs/yt-hopper/src/yt-hg/yt/data_objects/data_containers.pyc<br>
> in _refresh_data(self)<br>
> 307 """<br>
> 308 self.clear_data()<br>
> --> 309 self.get_data()<br>
> 310<br>
> 311 def keys(self):<br>
><br>
> /project/projectdirs/nyx/yt-installs/yt-hopper/src/yt-hg/yt/data_objects/data_containers.pyc<br>
> in get_data(self, fields)<br>
> 3377 try:<br>
> 3378 #print "Generating", field<br>
><br>
> -> 3379 self._generate_field(field)<br>
> 3380 continue<br>
> 3381 except NeedsOriginalGrid, ngt_exception:<br>
><br>
> /project/projectdirs/nyx/yt-installs/yt-hopper/src/yt-hg/yt/data_objects/data_containers.pyc<br>
> in _generate_field(self, field)<br>
> 3404 # First we check the validator; this might even raise!<br>
><br>
> 3405 self.pf.field_info[field].check_available(self)<br>
> -> 3406 self[field] = self.pf.field_info[field](self)<br>
> 3407 else: # Can't find the field, try as it might<br>
> 3408 raise KeyError(field)<br>
><br>
> /project/projectdirs/nyx/yt-installs/yt-hopper/src/yt-hg/yt/data_objects/field_info_container.pyc<br>
> in __call__(self, data)<br>
> 314 ii = self.check_available(data)<br>
> 315 original_fields = data.keys() # Copy<br>
> --> 316 dd = self._function(self, data)<br>
> 317 dd *= self._convert_function(data)<br>
> 318 for field_name in data.keys():<br>
><br>
> /project/projectdirs/nyx/yt-installs/yt-hopper/src/yt-hg/yt/frontends/enzo/fields.pyc<br>
> in _cic_particle_field(field, data)<br>
> 332 particle_field = <a href="http://field.name" target="_blank">field.name</a>[4:]<br>
> 333 top = na.zeros(data.ActiveDimensions, dtype='float32')<br>
> --> 334 if data.NumberOfParticles == 0: return top<br>
> 335 particle_field_data = data[particle_field] *<br>
> data['particle_mass']<br>
> 336<br>
> amr_utils.CICDeposit_3(data["particle_position_x"].astype(na.float64),<br>
><br>
> AttributeError: 'AMRCoveringGrid' object has no attribute<br>
> 'NumberOfParticles'<br>
><br>
> Are you not supposed to use a covering grid with these fields or am I<br>
> creating the covering grid incorrectly? I get reasonable looking plots if I<br>
> slice/project cic_particle_velocity_x, so I believe it's working otherwise.<br>
<br>
</div></div>As it stands, covering grids do not yet have particle support.<br>
<br>
Adding support should be relatively straightforward; inside get_data,<br>
if it's a particle field, set up a shadow region from the left_edge to<br>
the right_edge, and then retrieve the field from that.<br>
<br>
-Matt<br>
<br>
><br>
> Best,<br>
> Casey<br>
><br>
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</blockquote></div><br></div>
</div></div></blockquote></div><br></div>