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Re: OG polygon to EPS problem [message #31940 is a reply to message #31939]

Thu, 29 August 2002 14:37

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

"David Fanning" <david@dfanning.com> wrote in message
news:MPG.17d81ca4bab3db5098998a@news.frii.com...

> Mirko Vukovic (mvukovic@taz.telusa.com) writes:
>
>> In the following program, if I have hidden_lines on, the
>> post-script is shaded black. If I have hidden_lines off, I can see
>> the grid. This is in IDL5.4.on WinNT. The behavior with
>> hidden_lines on does not make sense to me. Anyone else?
>
> I think it is a mistake to think "vector" output is going to work
> with polygons. I'd leave that keyword off, and then see if the rest
> of it makes sense. I can't really tell here what I am suppose to be
> seeing. :-)

I concur with David. IDL Object Graphics is based on OpenGL, which
provides for rendering to bitmap destinations, but not to vector
graphics formats. When first introduced in version 5.0, OG had the
same limitation. RSI then reluctantly added vector output in version
5.1 or 5.2. (I think they got sick of hearing users say "My OG line
plot generates a 6 MB printer file, it takes 10 minutes to print, and
it doesn't look that hot either.") They warned that some features of
OG scenes would not be rendered properly in vector formats, but what
may surprise some people is *how many* features this warning applies
to. For example, fill patterns (as specified by the FILL_PATTERN
keyword) seem like pretty vector-ish entities, but they are not
rendered in vector formats. And I guess the same applies to
HIDDEN_LINES.

--
Mark Hadfield "Ka puwaha te tai nei, Hoea tatou"
m.hadfield@niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)

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[Message index]

		Re: OG polygon to EPS problem By: Karl Schultz on Fri, 30 August 2002 14:53
		Re: OG polygon to EPS problem By: David Fanning on Fri, 30 August 2002 10:48
		Re: OG polygon to EPS problem By: mvukovic on Fri, 30 August 2002 10:11
		Re: OG polygon to EPS problem By: Karl Schultz on Thu, 29 August 2002 15:43
		Re: OG polygon to EPS problem By: Mark Hadfield on Thu, 29 August 2002 14:37
		Re: OG polygon to EPS problem By: David Fanning on Thu, 29 August 2002 11:58
		Re: OG polygon to EPS problem By: mvukovic on Tue, 03 September 2002 09:00

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