Re: Bins 'n Zeebuf

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Angus Dorbie (dorbie++at++multipass.asd.sgi.com)
Mon, 16 Jun 1997 17:49:57 -0700

In that case you want to do something like glDepthFunc(GL_ALWAYS);

for your first bin but keep depth buffering enabled.

Cheers,
Angus

On Jun 16, 9:25pm, BOCCARA Michael wrote:
> Subject: Bins 'n Zeebuf
>
> [ plain text
> Encoded with "quoted-printable" ] :
  Hi pfOlks,
>
> Machine : REII 2CPU 1RM4 IRIX6.2 Performer 2.0.2 allpatched
> and HighImpact idem.
>
> I am using bins, but it is making me troubles.
> Here are my 3 questions, the last concerning more z buffer mechanisms.
>
> I have set a special bin number to a part of my geosets.
>
> 1 : setBinOrder
> When I call pfChannel::setBinOrder it works on our RE2, but it crashes on the
> HighImpact at the fisrt pfFrame call, preciselier in the CULL stage, at the
> _pfCuller::cull_Lsources function
> NB : I am calling setBinOrder for existing BIN numbers
> What is happening in this damned _pfCuller function ?
>
> 2: pfDrawBin
> When I call pfDrawBin(BIN_1) it lets my screen black, although there are
> geosets associated with BIN_1.
> WhenI replace it by pfDraw, all my scene is normally drawn, including the
> BIN_1-geosets.
> Did I forget something about pfDrawBin ?
>
> 3: ZBuffer
> I am calling the GL function zbuffer(FALSE), or the correponding glDisable
> OPENGL function, into the preDraw callback for a part of my scene which is
> veru far away, in order to avoid the zbuffer errors for confused polygons. It
> works, and there are no far-problems anymore.
> But I would like to store the Z values of this far geometry into the ZBuffer,
> without taking the results into account for drawing this geometry. I will use
> the result later in frame, after re-enabling Z buffer for other simpler
> geometry (lines, in fact).
> Was I clear, and if yes, is there any OPENGL minded person who could help me
> ? I am from the Pf generation, not the gl.
>
> Thank you,
>
> Mike
>
> Michael Boccara
> Aerospatiale - Joint Reasearch Center.
> michael.boccara(a)siege.aerospatiale.fr
> Tel : +33 (0)1 46 97 32 40
> Fax : +33 (0)1 46 97 32 59
> List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/
> Submissions: info-performer++at++sgi.com
> Admin. requests: info-performer-request++at++sgi.com
>-- End of excerpt from BOCCARA Michael

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