Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Fri, 14 Feb 1997 15:39:49 +0000
You scale < 1 the world gets smaller around the eye and so the
near clip appears more distant but it isn't.
This will also affect Z values and fog.
It doesn't surprise me that the performer cull doesn't look for scale in
the channel matrix, but this is just a performer implementation issue rather
than a fundamental discovery.
Cheers,
Angus.
On Feb 13, 2:58pm, Andrew Ng wrote:
> Subject: Scale in View Matrix.
> Hi there,
>
> Has anyone had any experience of using a uniform scale in the view matrix
> of a pfChannel?
>
> I've been playing around with this and it appears to have some strange and
> unexpected effects on the near clip plane. I've been using pfChanViewMat to
> set the pfChannel matrix.
>
> If I use a scale of < 1, then objects appear to clip sooner than I would
> have expected. If I use a scale of > 1, then objects don't appear to clip
> as soon as I would expect, in fact sometimes the objects are culled out
> before they are clipped.
>
> I'm using Performer 2.0.2 and IRIX 6.2 on an Indigo 2 Max Impact.
>
> I'd be grateful for any ideas or suggestions.
>
> Thanks.
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>
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>-- End of excerpt from Andrew Ng
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