Hi Nick,
The implementation is almost to complicated. Using instancing with
osg::Image and a texture almost beats all other implementations I've
tested so far in terms of complexity and performance.
Maybe we should some more examples for this to osg.
Cheers
Sebastian
Hi Luo,
have a look at this paper - it is OSG related with GL calls (In the
latest OSG release there are OSG wrappers for most of them). It will
help you with large number of instancing and controlling each instance
separately
http://3dcgtutorials.blogspot.com/2013/09/instancing-with-openscenegraph-part-ii.html
Hope it helps
Nick
On Wed, Jul 22, 2015 at 9:25 AM, Sebastian Messerschmidt
<sebastian.messerschm...@gmx.de
<mailto:sebastian.messerschm...@gmx.de>> wrote:
Hi,
Hi,
I need to use cylinder to simulate the “ladder”. So there are
many cylinder to create. I new a osg::Geode , and then use it
to new 10000 osg::MatrixTransform, all these
osg::MatrixTransform were added to one group.
But the program runs very very slow.
Are you testing in debug mode?
In fact I create the same scene using opengl, the program runs
quickly.
Are you using the osg::Shapedrawable for the cylinder shape? Try
to replace it with a simple triangle for testing to see if the
geometry or the transforms are your bottleneck.
I'd use hw-instancing for this amount of copies of a simple
geometry or bake the transformations into big geometries
representing hundreds of cylinders each.
Also if the 10000 elements are spatially separable and thus not
all of them in the view at the same time you should use some
grouping to balance your scenegraph. Simply putting 10000
transforms into one group most likely will kill performance, as
all children will have to be traversed each frame.
How can I upgrade my program?
thanks.
Can you provide a more detailed description or an example? Your
question is too open to get you specific answers.
Thank you!
Cheers,
LUO
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=64386#64386
Attachments:
http://forum.openscenegraph.org//files/mfc_osg_124.cpp
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