Hi Lingyun Yu -- You don't have a variable named 'galaxy' defined, so the "addDrawable(galaxy)" is suspicious.
I'd so a resize on the vertex and color arrays, rather than a push_back, for efficiency reasons. I don't think numParts>1000000 should cause any problems. OpenGL doesn not place an upper limit on the number of primitives you can render with a single glDrawArrays call. I don't really see anything that would cause a crash so I guess you should use a debugger and look at the call stack, like you would any other crash. Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com <http://www.skew-matrix.com/> +1 303 859 9466 -----Original Message----- From: osg-users-boun...@lists.openscenegraph.org [ <mailto:osg-users-boun...@lists.openscenegraph.org> mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Sent: Monday, April 13, 2009 9:27 AM To: osg-users@lists.openscenegraph.org Subject: [osg-users] Problem of points showing Hi, everybody, I met a problem when I want to show huge amount of points, as you can see the code below, if my NumPart is 1000000, no problem, it shows points properly. But if the NumPart is 2000000, then it shows a lot of lines. If NumPart is even bigger, the program complained like this：Microsoft C++ exception: std::bad_alloc at memory location 0x0030e898. I don't know that's because the dataset is too big or not? because while it shows not so many points, everything goes well. By the way, the data in P array are all right. osg::Geode *makeGalaxy() { osg::Geode *geode = new osg::Geode(); osg::Geometry *geometry= new osg::Geometry(); osg::Vec3Array *vertices = new osg::Vec3Array(); osg::Vec4Array *colors = new osg::Vec4Array(); osg::Vec4 ini(1,0.1,0.55,1); osg::Vec4 fin(0,1,0,1); for (int i = 1; i <= NumPart; i++) { vertices->push_back(osg::Vec3(P[i].Pos[0],P[i].Pos[1],P[i].Pos[2])); colors->push_back(ini+(fin-ini)*(i*1/NumPart)); } geometry->setVertexArray(vertices); geometry->setColorArray(colors); geometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX); geometry->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POINTS, 0, NumPart)); geode->addDrawable(galaxy); return geode; } ... Thank you. ------------------ Read this topic online here: <http://forum.openscenegraph.org/viewtopic.php?p=10166#10166> http://forum. openscenegraph.org/viewtopic.php?p=10166#10166 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org <http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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