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Re: shading/outlining on surface plot [message #82775 is a reply to message #82771]

Thu, 17 January 2013 10:09

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Bob Plano writes:

> Sorry if this is a dumb question, but....
>
> I'd like to make a surface or shade_surf plot, and outline areas on
> the surface. The basic idea is here:
>
>
>
> make_2d_gaussian,arr,xx,yy ;xx and yy are 2D
> grid point arrays
>
> shade_surf, arr,xx,yy,shades=whatever
>
> keep=where( arr gt .5*max(arr) and arr lt .7*max(arr) )
>
> sub_outline_procedure,arr(keep),xx(keep),yy(keep) ???????????????????
>
>
>
> Is there a relatively easy way to do this?

No, there are no easy ways to do this, I don't believe, although maybe
this is a case where function graphics can come to the rescue. One
problem is writing on the surface. It is very difficult to know,
unfortunately, where the actual surface *is*, due to round-off errors,
mostly.

You might try drawing a contour line on top of an image, then using that
to drape over the surface, but I don't expect good results. :-(

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		Re: shading/outlining on surface plot By: David Fanning on Fri, 18 January 2013 11:51
		Re: shading/outlining on surface plot By: astroboy.20000 on Fri, 18 January 2013 11:11
		Re: shading/outlining on surface plot By: David Fanning on Fri, 18 January 2013 09:43
		Re: shading/outlining on surface plot By: David Fanning on Fri, 18 January 2013 09:25
		Re: shading/outlining on surface plot By: chris_torrence@NOSPAM on Fri, 18 January 2013 09:08
		Re: shading/outlining on surface plot By: astroboy.20000 on Fri, 18 January 2013 09:02
		Re: shading/outlining on surface plot By: chris_torrence@NOSPAM on Thu, 17 January 2013 21:27
		Re: shading/outlining on surface plot By: David Fanning on Thu, 17 January 2013 10:09

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