From: Corner, Steve (s.corner++at++vr-centre.com)
Date: 12/02/2002 05:02:45
turn off z-buffering
render sky dome
turn on z-buffering
render the rest of the scene.
you only have to clear the z-buffer each frame too....
S.
-----Original Message-----
From: MLM Veraart [mailto:veraart++at++fel.tno.nl]
Sent: 02 December 2002 12:31
To: Brad Schwagler
Cc: info-performer++at++sgi.com
Subject: Re: [info-performer] overriding the clipping plane
Brad Schwagler wrote:
>
> I have a driving simulator with many objects in the
> scenegraph. If I make the clipping plane closer,
> distant objects are not drawn and the program runs at
> an acceptable drawing rate. This is what I want, but
> how can I still draw the sky-dome? I tried setting a
> pre-draw callback on the sky model where I would
> temporarily move back the clipping plane. The problem
> is that the channel and pipe are NULL in the callback
> func. Would it be better to use hundreds of LOD nodes
> on each indvidual object instead? Is there a
> different way of overriding the clipping plane?
> thanks
There are two ways I know to solve this.
1) remodel the dome a bit smaller
2) Put the dome in a separate pfScene.
Use an other channel mapped 'behind'/first to the window.
In this channel put the dome scene and set the clipping range right.
In the other scene disable the clearing of frame and Z-buffer in the
draw-callback.
Mario
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