| Re: Some questions on cgsurf and cgsurface [message #76968 is a reply to message #76964] |
Wed, 20 July 2011 13:13  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Paulo Penteado 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'
> Also, am I correct in thinking that all ps output is only bitmap? It
> is what it looked like from what I saw in the code.
A shaded surface is a bitmap, because what is returned
from SHADE_SURF is an image. Most other graphic output
is vectorized.
> Then I tried cgsurface:
>
> data=dist(200)
> loadct,33
> cgsurface,data,/shaded
>
> Which does make a much nicer looking ps file, which also matches what
> I see in the screen. But I could not find a way to programmatically
> make the file. And it also seems to only make bitmaps, at a fixed
> resolution.
Yes, there is no current way to create a PostScript file
programmatically. And, to make things easy, the
resolution is set to the window size. I am not sure
if this can be vectorized, and I can't research it right
now, as I am getting ready to leave Africa in a few hours.
I'm planning a report on the lion roaring outside my
hut, just 15 feet from my unlock screened door, and
the cheetah I saw in the wild! :-)
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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