Re: Draw Function calls w/ no scene
John Rohlf (jrohlf++at++tubes)
Wed, 23 Aug 95 17:57:56 PDT
>
> I am using Performer to run a visual data base. In my draw routine after I
> call pfDraw I call a gl program to draw some 2D text. For some reason when
> there is nothing to be drawn in the scene (i.e. the eyepoint is looking off
> in space and there is no ground or buildings in its view) the gl text is not
> drawn, but the routine is being called.
> Is there some optimization technique in Performer so that when nothing is in
> the viewing area the drawing is not rendered? If so is there a way to turn
> off this optimization? Any other suggestions as to why the gl text would not
> appear would be appreciated. Thanks.
> Stephanie Sroczyk, JJM Systems Inc. SSPSU91++at++aol.com
>
There is no optimization that I know of that would cause this
problem. On an Onyx you might have problems with tag clear but in that
case you would probably see other anomalies. Get a gldebug trace
and see what is being sent to GL.
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on Mon Aug 10 1998 - 17:51:49 PDT