Paul Melis wrote on Friday, May 29, 2009 9:55 AM: > Thrall, Bryan wrote: >> Paul Martz wrote on Thursday, May 28, 2009 4:50 PM: >> >>> You use a NodeVisitor to walk your scene graph and look for Geodes, >>> then iterate over the Drawables that are attached to the Geodes, using >>> dynamic_cast to access the Drawable as a Geometry. >>> >> >> Even better, I notice osg::Drawable has asGeometry(), which is cheaper than >> dynamic_cast<> :) >> > Wow, I wasn't expecting the difference to be this large, as virtual > function calls aren't completely free either: ... > 16:52|p...@tabu:~> ./t > 1 > asGeometry() : 1.181 ms > dynamic_cast<>(): 3.945 ms > 16:52|p...@tabu:~> g++ -O3 -o t t.cpp -I ~/osg2.8/include/ -L > ~/osg2.8/lib/ -losg -losgDB > 16:52|p...@tabu:~> ./t > 1 > asGeometry() : 0.839 ms > dynamic_cast<>(): 3.611 ms > 16:52|p...@tabu:~>
That's even more impressive than I was expecting! -- Bryan Thrall FlightSafety International [email protected] _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
