Re: Mirroring viewport/channel

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Angus Dorbie (dorbie++at++sgi.com)
Wed, 17 Nov 1999 14:39:07 -0800

You could scale -1 in eyespace X and reverse face culling to do this.

Fortunately OpenGL has a winding definition which allows you to
determine whether clockwise or anticlockwise is considered to be front
facing.

glFrontFace in conjunction with a pfDCS at the top of your scene graph
or a draw callback scaling operation would do the trick.

Cheers,ANgus.

"R. Krijnen" wrote:
>
> Hi,
>
> We have a mock-up where 3 of the 6 monitors are viewed through mirrors, so the
> user sees a mirrored (inverted) imaged.
> Is there a way of generating a mirrored pfChannel?
>
> I tried to define the viewport the other way around but that does not work
> (would be to nice).
> An other way of doing it is by reversing the electronics for the horizontal
> coils within the monitors. But unfortunately this only works well with black and
> white monitors :-(
>
> The output for the 6 monitors are generated using 6 pfChannels in one
> pfPipeWindow.
> We use an Onyx2 iR2 with a DG5-8 (8 outputs).
>
> Thanks

-- 
"Success is the ability to go from one failure to another with
 no loss of enthusiasm."    -    Winston Churchill.


Performer + OpenGL examples and tutors: http://www.dorbie.com/

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