[yt-users] Problem in simple volume rendering (yt-users Digest, Vol 36, Issue 18)

[Matthew Turk]

Hi Kuo-Chuan,

We have seen really long calculation times in the past.  If you use
the camera interface and specify:

no_ghost=True

when calling .camera( ... ) it should speed up the rendering time
considerably.  Try the camera interface, and give a shot at the
no_ghost option, and see if that improves it?

-Matt

On Thu, Feb 24, 2011 at 5:05 PM, Kuo-Chuan Pan <kpan2 at astro.illinois.edu> wrote:
> Dear Matt,
>
> Thank you so much for your help!
> Changing the width to pf.domain_right_edge -pf.domain_left_edge seems works now!
> but it is still calculating  (> 2hrs).
>
> I thought width=1 refer to the whole domain.
>
> After the calculation finished, I will let you know whether it works or not.
> Thank you so much.
>
> Best,
> Kuo-Chuan
>
>
>
> On Feb 24, 2011, at 3:46 PM, Matthew Turk wrote:
>
>> Hi Kuo-Chuan,
>>
>> You can also get the full domain by using the unit 'unitary' in the
>> same way you would use other units.  For example,
>>
>> 1.0/pf['unitary']
>>
>> should get you the largest box side length, so it should be the whole domain.
>>
>> When I update the recipes and documentation next, I will be more clear
>> that "1.0" refers to a particular method of describing the domain, and
>> I will move it to using "unitary" everywhere instead of the implicit
>> domain size.
>>
>> Let us know how it goes!
>>
>> Best,
>>
>> Matt
>>
>> On Thu, Feb 24, 2011 at 2:33 PM, j s oishi <jsoishi at gmail.com> wrote:
>>> Hi Kuo-Chuan,
>>>
>>>
>>>> 3.  I set the width = 1 as used in the example code.
>>>
>>> I think this is your problem. Flash uses cgs units, and so you are
>>> trying to volume render a volume of width 1 cm. This is far tinier
>>> than a single cell, and so no data (NoneType) is returned to the
>>> render.
>>>
>>> Instead, try setting width = pf.domain_right_edge -
>>> pf.domain_left_edge, assuming your parameter file is called pf. This
>>> should set the width to be the whole domain.
>>>
>>> I hope this helps,
>>>
>>> Jeff
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