On 12/14/2010 9:03 AM, Frank Sullivan wrote:
Hello,
I can tell that my OSG-based app is doing some sort of frustum culling, because
if I take the camera to the edge of the scene, and I turn it such that it isn't
looking at anything, the frame rate jumps to 500fps. However, when I turn back
around to look at my scene, the frame rate drops to about 60fps.
Yes, that's what a scene graph does. :-)
One thing I found interesting, though, is that this doesn't seem to work for
the far plane. If I aim my camera towards the scene, and I pull back until the
entire scene disappears beyond the far plane, my frame rate remains at about
50-60fps.
Does anyone know why this is happening, and if there is a way to fix it?
First, frame rate is a lousy indication of how hard your system is working.
Better would be to look at the actual cull and draw times per frame as displayed
with the stats handler.
As Robert mentioned, OSG doesn't cull against the far plane by default. I
imagine your scene is disappearing due to small feature culling. Small feature
culling may or may not decrease your cull time, depending on distance between
viewer and scene elements. But it should certainly reduce your draw time.
--
-Paul Martz Skew Matrix Software
http://www.skew-matrix.com/
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