Hi all,
Forgot to mention the timings below are with a release mode build of our
application. I'll see if I can transpose the results in a basic
osgviewer-based app using the same technique... Perhaps there's
something screwy with our scene graph.
In any case, if anyone has any comments about the results and questions
below, I'd be very interested in reading them. Thanks,
J-S
The following random bytes came from Jean-Sébastien Guay's keyboard :
Hi all,
As I said before, I'm working on a modeling-type application. To give
feedback of which object is selected, I'd like to outline it in white
(or any color).
I've currently got two implementations of an outline effect (using
osgFX::Effect), one of which uses the stencil buffer, the other which
doesn't but does basically the same things (render back faces as lines,
with a line width of 3, with a depth function of LEQUAL, etc.). Pretty
classic.
In both cases, my cull, draw and GPU times jump inordinately high when
the effect is active. For a pretty simple object, I get the following:
Without effect:
Cull 0.4
Draw 0.5
GPU 0.12
With effect:
Cull 1.43
Draw 2.3
GPU 2.7
That seems apalling to me... I would think the time would *at most*
double, and I would be hesitant to use the effect if it did. So more
than triple is just too much.
Is there some explanation for this? More importantly, is there some
other technique I could use to get an outline around my object, which
would have less of an impact? What do others do to get similar effects?
Thanks in advance,
J-S
--
______________________________________________________
Jean-Sebastien Guay [EMAIL PROTECTED]
http://www.cm-labs.com/
http://whitestar02.webhop.org/
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