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Re: How to draw IDLgrPlots over IDLgrImages? [message #67908 is a reply to message #67816]

Sun, 06 September 2009 20:54

Robbie
Messages: 165
Registered: February 2006

Senior Member

The IDL manual says something like:

Disabling the depth test function allows all primitives to be drawn on
the screen without testing their depth.
When the depth test is disabled, the last item drawn at a location is
the item that is on top.

I think that if you are using depth testing then you must be aware
that objects might disappear if they fall out of the clipping range.
For example the default value of the ZCLIP property of IDLgrView is
[-1,1]. You may also find the clipping to be graphics card dependant.

It's far simpler to avoid depth testing if at all possible when
drawing a 2D scene.
That being said, I still have a tendency to 'hack' scenes using depth
testing.

Robbie

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[Message index]

		Re: How to draw IDLgrPlots over IDLgrImages? By: David Fanning on Thu, 27 August 2009 13:03
		Re: How to draw IDLgrPlots over IDLgrImages? By: natha on Thu, 27 August 2009 09:55
		Re: How to draw IDLgrPlots over IDLgrImages? By: David Fanning on Thu, 27 August 2009 09:30
		Re: How to draw IDLgrPlots over IDLgrImages? By: natha on Thu, 27 August 2009 09:17
		Re: How to draw IDLgrPlots over IDLgrImages? By: David Fanning on Thu, 27 August 2009 09:06
		Re: How to draw IDLgrPlots over IDLgrImages? By: Robbie on Sun, 06 September 2009 20:54

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