If you're just updating an existing array, you don't need to call setVertexArray (etc); but you need to mark it dirty by calling
m_vertices->dirty(); That applies also to your other buffer objects (color array, elements, etc.) Glenn Waldron On Thu, Apr 28, 2016 at 3:51 PM, Daniel Neos <[email protected]> wrote: > Greetings everyone, > > I am trying to display a point cloud, consisting of vertices and color > with OpenSceneGraph. A static point cloud to display is rather easy with > this guide. > But I am not capable of updating such a point cloud. My intention is to > create a geometry and attach it to my viewer class once. > This is the mentioned method which is called once in the beginning. > > The OSGWidget strongly depends on this OpenGLWidget based approach. > > > Code: > > void OSGWidget::attachGeometry(osg::ref_ptr<osg::Geometry> geom) > { > osg::Geode* geode = new osg::Geode; > > geom->setDataVariance(osg::Object::DYNAMIC); > geom->setUseDisplayList(false); > geom->setUseVertexBufferObjects(true); > bool addDrawSuccess = geode->addDrawable(geom.get()); // Adding Drawable > Shape to the geometry node > > > if (!addDrawSuccess) > { > throw "Adding Drawable failed!"; > } > > osg::StateSet* stateSet = geode->getOrCreateStateSet(); > stateSet->setMode(GL_LIGHTING, osg::StateAttribute::OFF); > > > float aspectRatio = static_cast<float>(this->width()) / > static_cast<float>(this->height()); > > // Setting up the camera > osg::Camera* camera = new osg::Camera; > camera->setViewport(0, 0, this->width(), this->height()); > camera->setClearColor(osg::Vec4(0.f, 0.f, 0.f, 1.f)); // Kind of > Backgroundcolor, clears the buffer and sets the default color (RGBA) > camera->setProjectionMatrixAsPerspective(30.f, aspectRatio, 1.f, 1000.f); > // Create perspective projection > camera->setGraphicsContext(graphicsWindow_); // embed > > osgViewer::View* view = new osgViewer::View; > view->setCamera(camera); // Set the defined camera > view->setSceneData(geode); // Set the geometry > view->addEventHandler(new osgViewer::StatsHandler); > > > osgGA::TrackballManipulator* manipulator = new osgGA::TrackballManipulator; > manipulator->setAllowThrow(false); > > view->setCameraManipulator(manipulator); > > /////////////////////////////////////////////////// > // Set the viewer > ////////////////////////////////////////////////// > viewer_->addView(view); > viewer_->setThreadingModel(osgViewer::CompositeViewer::SingleThreaded); > viewer_->realize(); > > this->setFocusPolicy(Qt::StrongFocus); > this->setMinimumSize(100, 100); > > this->setMouseTracking(true); > } > > > > > > This method gets set once and shall set up the camera, interactor settings > and the overall scene which only consists of one geode containing the > geometry which shall be updated continiously. > And after I have 'attached' the geometry, I am trying to update the > geometry like this > > > Code: > > void PointCloudViewOSG::processData(DepthDataSet depthData) > { > if (depthData.points()->empty()) > { > return; // empty cloud, cannot do anything > } > > const DepthDataSet::IndexPtr::element_type& index = *depthData.index(); > const size_t nPixel = depthData.points().get()->points.size(); > > if (depthData.intensity().isValid() && !index.empty() ) > { > for (int i = 0; i < nPixel; i++) > { > float x = depthData.points().get()->points[i].x; > float y = depthData.points().get()->points[i].y; > float z = depthData.points().get()->points[i].z; > m_vertices->push_back(osg::Vec3(x > , y > , z)); > > // 32 bit integer variable containing the rgb (8 bit per channel) > value > uint32_t rgb_val_; > memcpy(&rgb_val_, &(depthData.points().get()->points[i].rgb), > sizeof(uint32_t)); > > uint32_t red, green, blue; > blue = rgb_val_ & 0x000000ff; > > rgb_val_ = rgb_val_ >> 8; > green = rgb_val_ & 0x000000ff; > > rgb_val_ = rgb_val_ >> 8; > red = rgb_val_ & 0x000000ff; > > m_colors->push_back( > osg::Vec4f((float)red / 255.0f, > (float)green / 255.0f, > (float)blue / 255.0f, > 1.0f) > ); > } > > m_geometry->setVertexArray(m_vertices.get()); > > m_geometry->setColorArray(m_colors.get()); > > m_geometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX); > > m_geometry->addPrimitiveSet(new > osg::DrawArrays(osg::PrimitiveSet::POINTS, 0, m_vertices->size())); > } > } > > > > > (Apperantly the code tag can somehow not handle the whitespaces but i will > let it be since it is more readable than if everything is aligned) > > So my guess is that the addPrimitiveSet(...) shall not be called > everytime I update the geometry, since it will push_back > the primitive set everytime the geometry gets updated? > > Do I have to reattach my geometry after every update? Or do I have to > rewrite my update method? > So it boils down to the question What steps are necessary to update my > underlying geometry with new vertices and colors > > I have read the basic tutorials and looked for similar questions in this > forum > and the only thing that I could adapt is the use of VBO for performance > gain > > PointCloudlibrary (PCL) is unfortunately not an alternative since of some > incompatibilities with my application. > > > > > Thank you! > > Cheers, > Daniel > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=67011#67011 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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