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Re: Bug in the IDL8.1 VECTOR function ? [message #75936 is a reply to message #75935]

Thu, 05 May 2011 11:56

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Laurent Testut writes:

> Thanks David but what do you call software rendering turned on?
> Anyway I've a double boot so tomorrow I will try to crash my windows
> IDL !

Object graphics commands can be rendered using the
OpenGL libraries build into your graphics card
(hardware rendering) or using the OpenGL Mesa
Library that is distributed with IDL (software
rendering). Hardware rendering is the preferred
(and default) choice, since graphics cards will
typically implement some kind of hardware acceleration
process that will make the rending faster (MUCH faster,
in some cases) than software rending.

But, you can choose which of these options you
want. You can choose it at the window level with
the RENDERER keyword to an IDLgrWindow or draw widget
object, or you can choose it at the system level using
some preference that I can never remember and can never
find. (Maybe someone will remind both of us.) In the
Workbench, you choose the IDL preferences and the
Graphics tab. You will find a switch there.

Many, many problems in object graphics display are caused
by lousy OpenGL libraries on graphics cards. So ANY time
you have a problem with object graphics output, you test
it with software rendering so you can be sure to know who
you should be complaining to. Not that it makes all that
much difference. No one's going do anything for you, except to
remind you to go get the latest drivers for your graphics
display card. Something you are doing routinely anyway, right?

Cheers,

David

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

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[Message index]

		Re: Bug in the IDL8.1 VECTOR function ? By: David Fanning on Fri, 06 May 2011 05:34
		Re: Bug in the IDL8.1 VECTOR function ? By: penteado on Fri, 06 May 2011 05:31
		Re: Bug in the IDL8.1 VECTOR function ? By: Laurent Testut on Fri, 06 May 2011 05:01
		Re: Bug in the IDL8.1 VECTOR function ? By: penteado on Thu, 05 May 2011 12:49
		Re: Bug in the IDL8.1 VECTOR function ? By: Michael Galloy on Thu, 05 May 2011 12:13
		Re: Bug in the IDL8.1 VECTOR function ? By: David Fanning on Thu, 05 May 2011 11:56
		Re: Bug in the IDL8.1 VECTOR function ? By: Laurent Testut on Thu, 05 May 2011 11:25
		Re: Bug in the IDL8.1 VECTOR function ? By: David Fanning on Thu, 05 May 2011 08:32

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