On Fri, Jan 28, 2011 at 4:44 PM, Jean-Sébastien Guay < [email protected]> wrote:
> Hi Tim, > > > If I understand correctly how the sky dome mesh is constructed, there >> was a lot of duplication of vertices in the triangle strip arrays, and >> this has been carried forward into your indexed mesh approach. The >> INDEX_MESH optimizer would remove these duplicates. The order of the >> triangles in the output of INDEX_MESH should be the same as the input >> order, but it might be tricky to pick corresponding triangles out of the >> new mesh. Since this is such a regular mesh, the vertex cache optimizers >> would make a small difference; however, you would totally lose the order >> of the mesh. >> > > Incidentally, I tried running the INDEX_MESH optimizer on the created > subgraph (at the end of the constructor in the file I attached in my > previous post) but it would crash in MyTriangleOperator::operator() - it > goes out of bounds on the _remapIndices list. The other two optimizers also > go out of bounds in similar ways. > > That sucks. I'll take a look. Tim > Here's a modified Sphere.cpp with the code from the MeshOptimizers simply > copied into it (for simplicity of testing) if you want to have a look. > > I'm still not sure the order of the mesh is really important. I said that > before because it would have explained why the strips were arranged like > that, but I'm not sure now. So if I could get the INDEX_MESH optimizer not > to crash, I think using that and the other two (post/pre transform) would > probably work well. I could test it and see at least. > > > What was the actual performance difference? >> > > With only the skydome in the scene, Draw went from about 0.45 to 0.4 on my > i7 920 + GTX 260. However it made the number of batches (draw calls) go way > down, of course - replacing 768 draw calls by 16 is good, but I guess we > could do better. > > > Thanks, > > J-S > -- > ______________________________________________________ > Jean-Sebastien Guay [email protected] > http://www.cm-labs.com/ > http://whitestar02.webhop.org/ > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
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