[yt-users] camera question

Michael Zingale michael.zingale at stonybrook.edu
Sat May 24 13:05:00 PDT 2014


Looks like google turned up an older version of the docs, you are right,
the latest yt sets alpha to 1.


On Sat, May 24, 2014 at 4:00 PM, Stephanie Tonnesen <stonnes at gmail.com>wrote:

> Hi Michael and Nathan,
>
> Thanks for the help!  Michael, everywhere I have been looking in the
> documentation it says for alpha: "The alpha value height for each Gaussian.
> If not supplied, it is set as 1.0 everywhere."  (
> http://yt-project.org/docs/dev/reference/api/generated/yt.visualization.volume_rendering.transfer_functions.ColorTransferFunction.add_layers.html?highlight=add_layers#yt.visualization.volume_rendering.transfer_functions.ColorTransferFunction.add_layers)
> Can you send me a link to what you are referring to so I can try and figure
> out which applies?
>
> Nathan, that is what I get for not scrolling to the bottom of the page!  I
> will play around with this.
>
> -Stephanie
>
>
> On Fri, May 23, 2014 at 11:09 AM, Michael Zingale <
> michael.zingale at stonybrook.edu> wrote:
>
>> My guess is that you need to play with the alpha values when you
>> add_layers.  From the docs, if you don't supply alpha, it is:
>>
>> "The alpha value height for each Gaussian. If not supplied, it is
>> calculated as the logspace between -2.0 and 0.0"
>>
>> so it looks like the last value you add will have alpha = 1, i.e. opaque.
>>
>>
>>
>> On Fri, May 23, 2014 at 10:57 AM, Stephanie Tonnesen <stonnes at gmail.com>wrote:
>>
>>> Hi all,
>>>
>>> I am trying to make a nice volume rendering, and am having some
>>> trouble.  My camera commands are:
>>> tf = ColorTransferFunction((-29,-24))
>>> tf.add_layers(8,w=0.1,colormap="Hue Sat Value 2")
>>> tf.sample_colormap(-26.5,w=0.02,colormap="Hue Sat Value 2")
>>> cam = pf.h.camera([0.0,2.,1.8],[0.0,-1.0,-0.2],4.0,512,tf)
>>> cam.show()
>>>
>>> I will attach the image, also (v11).  First, when I use add_layers, can
>>> I get yt to print out WHERE the layers are?  Second, but related, when I
>>> just use add_layers I only see the higher density gas.  I have to add
>>> sample_colormap to see lower density gas (the blue stuff).  Compare v11 to
>>> v6 to see what I am talking about.
>>>
>>> Thanks!
>>>
>>> Stephanie
>>>
>>> _______________________________________________
>>> yt-users mailing list
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>>>
>>>
>>
>>
>> --
>> Michael Zingale
>> Associate Professor
>>
>> Dept. of Physics & Astronomy • Stony Brook University • Stony Brook, NY
>> 11794-3800
>> *phone*:  631-632-8225
>> *e-mail*: Michael.Zingale at stonybrook.edu
>> *web*: http://www.astro.sunysb.edu/mzingale
>>
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>>
>
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>


-- 
Michael Zingale
Associate Professor

Dept. of Physics & Astronomy • Stony Brook University • Stony Brook, NY
11794-3800
*phone*:  631-632-8225
*e-mail*: Michael.Zingale at stonybrook.edu
*web*: http://www.astro.sunysb.edu/mzingale
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