RE: [info-performer] DrawCallBack

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From: Gordon Tomlinson (gordon++at++gordon-tomlinson.com)
Date: 07/06/2005 06:19:29

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BTW A Drawcallback will do nothing by its self, its what you do within the
function that counts

Best Regards

Gordon
___________________________________

Gordon Tomlinson

Email : gordon++at++3dscenegraph.com
Yim/Aim : Gordon3dBrit
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-----Original Message-----
From: owner-info-performer++at++performer.engr.sgi.com
[mailto:owner-info-performer++at++performer.engr.sgi.com] On Behalf Of Gordon
Tomlinson
Sent: Wednesday, July 06, 2005 1:52 PM
To: 'Rajesh R'; info-performer++at++sgi.com
Subject: RE: [info-performer] DrawCallBack

Well

One reason and an important reasons is the Draw process is the only process
that has a Valid Opengl Context and thus the only place you can use direct
Opengl calls.

While performer is very powerful, but there are many reasons why you would
need to use Opengl directly and you do that in a draw-call-back

You might want to create a HUB or other overlay typically you would do this
in a Post-draw call-back

Best Regards

Gordon
___________________________________

Gordon Tomlinson

Email : gordon++at++3dscenegraph.com
Yim/Aim : Gordon3dBrit
Msn Im : Gordon3dBrit++at++3dscenegraph.com
Forums : www.3dscenegraph.com/3dsceneBB

-----Original Message-----
From: owner-info-performer++at++performer.engr.sgi.com
[mailto:owner-info-performer++at++performer.engr.sgi.com] On Behalf Of Rajesh R
Sent: Wednesday, July 06, 2005 12:49 PM
To: info-performer++at++sgi.com
Subject: [info-performer] DrawCallBack

Dear Performers,

This is a simple question, Why we need A DrawCallBack Function. What it will
do.

Rajesh.R

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