[yt-users] coloring grids and change the range of slices

[Britton Smith]

Hi Wolfram,

For your second question, if you are asking about how to change the x and y
limits of the image place for a slice, you can do that with:
pc.set_lim((xmin, xmax, ymin, ymax))

Britton

On Fri, Dec 17, 2010 at 11:01 AM, Matthew Turk <matthewturk at gmail.com>wrote:

> Hi Wolfram,
>
> On Fri, Dec 17, 2010 at 12:58 AM, Wolfram Schmidt
> <schmidt at astro.physik.uni-goettingen.de> wrote:
> > Hi,
> >
> > I've got two questions:
> >
> > (1) Is it possible to change the colors of grid boundaries (produced
> > with the grids callback), preferably, using different colors
> > corresponding to refinement levels?
>
> As it's written in the code currently, no, this isn't available.  But
> I was able to modify the existing one to handle this.  I've placed a
> copy here:
>
> http://paste.enzotools.org/show/1446/
>
> which you can download with:
>
> yt_lodgeit.py --download=1446
>
> If you put this in ~/.yt/my_plugins.py, it should be accessible as
> "level_grids", for instance:
>
> pf = load("tests/DD0010/moving7_0010")
> pc = PlotCollection(pf, [0.5, 0.5, 0.5])
> p = pc.add_projection("Density", 0)
> p.modify["level_grids"](1, color=(0.0,0.0,0.0))
> p.modify["level_grids"](2, color=(1.0,0.0,0.0))
> p.modify["level_grids"](3, color=(0.0,1.0,0.0))
> pc.save()
>
> the first argument is the level, then you specify the color in an rgb
> triple.
>
> >
> > (2) Surely, there must be something to specify the x- and y-range
> > of slices. Where in the documentation is it explained how to do that?
>
> The slice operator in yt is an infinitely thin, and only returns those
> cells it intersects.  One option would be to take a thin projection,
> where the line integral or the average through some thin set of the
> domain is taken:
>
> thickness = 0.1
> pc.add_thin_projection("Density", 0, thickness)
>
> However, one word of caution is that the thin projection operator is
> greedy; any cell that it intersects with will be selected *wholly*.
> This can lead to artifacts if you take straight line integrals.  If
> you average, these artifacts will be somewhat less visible.
>
> If you want to be much more careful with thick projections, using both
> interpolation and paths that do not operate in full cell width
> intervals, you can use the ProjectionTransferFunction to volume render
> it, which will take the line integral as specified along an image
> plane.
>
> Hope that helps,
>
> Matt
>
> >
> > Best regards,
> > Wolfram
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> >
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