[yt-users] camera question

[Stephanie Tonnesen]

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
>>
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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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