Hi Brad, Check to make sure your Geometry has setDataVariance(osg::Object::DYNAMIC). That solved the problem for most of our similar cases.
- Dan From: osg-users [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Brad Colbert Sent: Friday, June 01, 2018 10:20 AM To: osg-users@lists.openscenegraph.org Subject: [osg-users] Updating VBO's during runtime I'm updating my vertices at runtime. I've found a few posts that discuss this: (a couple are:) http://forum.openscenegraph.org/viewtopic.php?t=14826 http://forum.openscenegraph.org/viewtopic.php?t=15782 Let me first mention that I've compiled OSG with GL3 support, so no display lists. That said, I'm still calling: pointsGeom->setUseDisplayList(false); pointsGeom->setUseVertexBufferObjects(true); Here is a snippet of my call to update the vertices (v_ = vertices, c_ = colors, n_ = normals, da_ = DrawArrays, g_ = Geometry): for (int i = 0; i < numVertices; i++) { // Verticies v_.at(i)[0] = 500.f * (0.0f + (3.0f * float(rand() % 1000) / 1000.f) - 1.5f); v_.at(i)[1] = 500.f * (0.0f + (4.0f * float(rand() % 1000) / 1000.f) - 2.f); v_.at(i)[2] = 500.f * (1.5f + (0.1f * float(rand() % 1000) / 1000.f) - 0.05f); // Colors c_.at(i)[0] = 1.f; c_.at(i)[1] = 1.f; c_.at(i)[2] = 1.f; c_.at(i)[3] = 1.f; // Normals n_.at(i)[0] = 0.f; n_.at(i)[1] = 1.f; n_.at(i)[2] = 0.f; } v_.dirty(); c_.dirty(); n_.dirty(); da_.setCount(numVertices); da_.dirty(); // *** The dirty() calls above are supposed to tell OSG to update the VBO's. For // some reason this isn't happening. We are going to force it here. Not sure of the // performance implications but hopefully this is temporary. g_.setVertexArray(&v_); g_.setColorArray(&c_); g_.setNormalArray(&n_); g_.dirtyBound(); The update just doesn't happen unless I call the setVertexArray, setColorArray, setNormalArray methods which doesn't match what the previous posts about this topic. Is this because of GL3 or something else? Thanks, Brad
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