| Re: Some questions on cgsurf and cgsurface [message #76960] |
Wed, 20 July 2011 19:16  |
penteado
Messages: 866
Registered: February 2018
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Senior Member
Administrator |
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That is very helpful. Thanks.
On Jul 20, 11:00 pm, David Fanning <n...@dfanning.com> wrote:
> David Fanning writes:
>>> I have been trying to make shaded surfaces with CG, and encountered a
>>> few difficulties, which perhaps have obvious solutions for those who
>>> can find their way around the CG routines:
>
>>> I tried to follow the examples with
>
>>> data=dist(200)
>>> loadct,33
>>> cgwindow,'cgsurf',data,/shaded
>>> cgcontrol,create_ps='cgtest.ps'
>
>>> Which results in a file with a red background. The same if using the
>>> menu in the window.
>
>> Yes, this is because shaded surfaces are really
>> images with axes overlayed on them. To get a white
>> background, you will have to do something like this:
>
>> data=dist(200)
>> loadct,33, ncolors=254
>> set_shading, values=[0,254]
>> tvlct, 255, 255, 255, 255
>> cgwindow,'cgsurf',data,/shaded
>> cgcontrol,create_ps='cgtest.ps'
>
> I woke up at 4AM for some reason, so I decided to fix this
> problem before I jumped on the plane. The cgSurf program
> now produces correct PostScript output in the original
> way Paulo called the program. You can find the updated
> program here:
>
> http://www.idlcoyote.com/programs/cgsurf.pro
>
> Testing revealed a couple of problems with the Z-graphics
> buffer and other Coyote Graphics programs, which I also
> fixed.
>
> http://www.idlcoyote.com/programs/cgdefcharsize.pro
> http://www.idlcoyote.com/programs/cgquery.pro
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.dfanning.com/
> Sepore ma de ni thue. ("Perhaps thos speakest truth.")
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