From: Dick Rous (dick++at++sgi.com)
Date: 09/21/2005 00:18:47
When you're inside the sphere looking out, you look against the back
faces of the sphere.
Using perfly, these faces are culled by default, hence invisible.
To alter this behaviour, either model the inside of the sphere or
disable back face culling:
pfCullFace(PFCF_OFF);
Dick.
> -----Original Message-----
> From: owner-info-performer++at++performer.engr.sgi.com
> [mailto:owner-info-performer++at++performer.engr.sgi.com] On
> Behalf Of Raymond Wadie
> Sent: Wednesday, September 21, 2005 08:27
> To: info-performer++at++sgi.com
> Subject: [info-performer] near boundary of the frustum
>
> Hi there
>
> I have a problem :(
>
> If I'm drawing a sphere and I adjust the near boundary of the
> frustum so
> that It will make a cross-section in the sphere, the beck half of the
> sphere will not be draw which results in viewing the objects
> behind the
> cross section of the sphere
>
> In other words, if I made the centre of the sphere lies on the near
> boundary of the frustum the sphere won't be drawn at all !!
>
> Is there anyway so that I could force Performed to draw both halves of
> the sphere (the front half and the back half), not only the front one?
>
> Thanks in advance :)
>
> Raymond Wadie
> Software Engineer
> ICT Department
> Bibliotheca Alexandrina
> P.O. Box 138, El Shatby
> Alexandria 21526, Egypt
> Tel: +(203) 483 9999 Ext:1496
> Email: Raymond.Wadie++at++bibalex.org
> Web Site: www.bibalex.org
>
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