Re: [idvusers] "Visible range" not showing image beneath

On 4/21/08, Don Murray <dmurray@xxxxxxxxxxxxxxxx> wrote:
> Hi Dan-
>
>  When you use the visible range or the color table you'll need to make
>  sure that the image is "on top".  Use the View->Bring To Front menu
>  option of the theta-e display control.

That did it. Not sure how I missed that option. Previously I did
inspect the layers from a side view to confirm that the theta-e
surface was above the sat pic, which was set to Bottom on the vertical
position slider.

>
>  Are you using a 2D or 3D display?

3D, theta-e at 850 hPa and the sat pic on "bottom".

>
>  For the projection problem, do you have Fast Rendering turned on or off?
>  Do you get different results depending on that setting?

If you're referring to the sat pic disappearing when switching to
Europe, I had Fast rendering on, but turning it off makes no
difference. BTW changing fast rendering on and off makes the wireframe
box reappear when I'd selected it off. Minor but annoying ;-).


Dan

>
>  Don
>
>  Dan Grey wrote:
>
> >
> > Hi Tom,
> >
> > NB forgot to mention that I'm using v2.4.
> >
> > The original method I was trying was selecting the "visible range"
> > check box beneath the colour table button on the Display tab of the
> > Dashboard, which un-greys-out the "Change" button next to it, and
> > using that button to change the visible range. No joy.
> >
> > I tried your method but it fails in the same way as my original method
> > -- see attached pic.
> >
> > Your example picture is exactly what I'm trying to achieve so I'm at a
> > loss as to why it's not working for me!
> >
> > I do wonder if this problem is in some way tied to the sat pic I'm
> > using, which is a MSG image. It only displays if I use the "MSGT"
> > projection -- switching to a different projection, such as the
> > predefined Europe projection for a more top-down view, causes the
> > satellite picture to disappear (all the other displays remain).
> >
> > To test that I recreated something similar to your example image
> > (using 2.5 deg data to save time, hence the blockiness!). Using my
> > original "visible range" method has the desired result (see second
> > attachment). I also tried your method, which also worked.
> >
> > (BTW note the odd bug in the second image with the display list text
> > -- it's hidden behind the satpic. This again seems related to the
> > projection: I was using the predefined US CONUS projection. The
> > display list appeared normally using "World" or "North Pole".)
> >
> >
> > Dan
> >
> >
> > On 4/20/08, Tom Whittaker <whittaker@xxxxxxxx> wrote:
> >
> > >
> > > Hi Dan --
> > >
> > >  I assume from your description that you tried to do a "change range"
> > >  on the theta-e plot.  In my example, the original range was
> > >  250-420K.....so perhaps you just tried changing the range to something
> > >  like 310-420K or something?
> > >
> > >  The behaviour of this is that it then treats all values from 250-309
> > >  as if there were equal to 310, for the purpose of mapping from the
> > >  data to the color table.
> > >
> > >  The way I know of to accomplish this is to edit the color table, click
> > >  on the "Transparency" radio button, set the transparency to 100%, and
> > >  then grab the slider above the "250" and drag it to the right (you
> > >  should see black/white checkboard pattern).  You will then get
> > >  something like the attached (I hope) image.
> > >
> > >  Hope that helps...
> > >
> > >  tom
> > >
> > >
> > >  On Sun, Apr 20, 2008 at 12:42 PM, Dan Grey <dangrey@xxxxxxxxx> wrote:
> > >  > I've got a sat pic (from a server under "Images") on the surface, and
> > >  >  a colour-shaded plot of theta-e at 850 hPa from the GFS above. I
> > >  >  restrict the visible range of the theta-e to a value so only areas
> > >  >  above a certain value are shown (to illustrate a plume event).
> However
> > >  >  areas with theta-e below my range appear black, rather than showing
> > >  >  through the sat pic below.
> > >  >
> > >  >  Am I missing something simple, is this is intended behaviour, or is
> it a bug?
> > >  >
> > >  >
> > >  >  Dan
> > >
> > >
> ------------------------------------------------------------------------
> > >
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> > >
> >
>
>  --
> *************************************************************
>  Don Murray                               UCAR Unidata Program
>  dmurray@xxxxxxxxxxxxxxxx                        P.O. Box 3000
>  (303) 497-8628                              Boulder, CO 80307
>  http://www.unidata.ucar.edu/staff/donm
> *************************************************************
>
>