OSG绘制几何图形

在OSGMFC程序基础上修改OSG_MFC类的方法，如下：

 void cOSG::InitSceneGraph(void)
 {
     // Init the main Root Node/Group
     mRoot  = new osg::Group;

     //// Load the Model from the model name
     //mModel = osgDB::readNodeFile(m_ModelName);
     //if (!mModel) return;

     // Optimize the model
     //osgUtil::Optimizer optimizer;
     //optimizer.optimize(mModel.get());
     //optimizer.reset();

     //// Add the model to the scene
     //mRoot->addChild(mModel.get());

     osg::Geode* pyramidGeode = new osg::Geode();
     osg::Geometry* pyramidGeometry = new osg::Geometry();
     pyramidGeode->addDrawable(pyramidGeometry);
     mRoot->addChild(pyramidGeode);

     osg::Vec3Array* pyramidVertices = new osg::Vec3Array;
     pyramidVertices->push_back( osg::Vec3( , , ) ); // front left
     pyramidVertices->push_back( osg::Vec3(, , ) ); // front right
     pyramidVertices->push_back( osg::Vec3(,, ) ); // back right
     pyramidVertices->push_back( osg::Vec3( ,, ) ); // back left
     pyramidVertices->push_back( osg::Vec3( , ,) ); // peak

     pyramidGeometry->setVertexArray( pyramidVertices ); 

     osg::DrawElementsUInt* pyramidBase = new osg::DrawElementsUInt(osg::PrimitiveSet::QUADS, );
     pyramidBase->push_back();
     pyramidBase->push_back();
     pyramidBase->push_back();
     pyramidBase->push_back();
     pyramidGeometry->addPrimitiveSet(pyramidBase); 

     osg::DrawElementsUInt* pyramidFaceOne = new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, );
     pyramidFaceOne->push_back();
     pyramidFaceOne->push_back();
     pyramidFaceOne->push_back();
     pyramidGeometry->addPrimitiveSet(pyramidFaceOne);

     osg::DrawElementsUInt* pyramidFaceTwo =
       new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, );
     pyramidFaceTwo->push_back();
     pyramidFaceTwo->push_back();
     pyramidFaceTwo->push_back();
     pyramidGeometry->addPrimitiveSet(pyramidFaceTwo);

     osg::DrawElementsUInt* pyramidFaceThree =
       new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, );
     pyramidFaceThree->push_back();
     pyramidFaceThree->push_back();
     pyramidFaceThree->push_back();
     pyramidGeometry->addPrimitiveSet(pyramidFaceThree);

     osg::DrawElementsUInt* pyramidFaceFour =
       new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, );
     pyramidFaceFour->push_back();
     pyramidFaceFour->push_back();
     pyramidFaceFour->push_back();
     pyramidGeometry->addPrimitiveSet(pyramidFaceFour);

     osg::Vec4Array* colors = new osg::Vec4Array;
     colors->push_back(osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f) ); //index 0 red
     colors->push_back(osg::Vec4(0.0f, 1.0f, 0.0f, 1.0f) ); //index 1 green
     colors->push_back(osg::Vec4(0.0f, 0.0f, 1.0f, 1.0f) ); //index 2 blue
     colors->push_back(osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f) ); //index 3 white
     colors->push_back(osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f) ); //index 4 red

     pyramidGeometry->setColorArray(colors);
     pyramidGeometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);

     // Declare and initialize a transform node.
     osg::PositionAttitudeTransform* pyramidTwoXForm = new osg::PositionAttitudeTransform;

     // Use the 'addChild' method of the osg::Group class to
     // add the transform as a child of the root node and the
     // pyramid node as a child of the transform.
     mRoot->addChild(pyramidTwoXForm);
     pyramidTwoXForm->addChild(pyramidGeode);

     // Declare and initialize a Vec3 instance to change the
     // position of the tank model in the scene
     osg::Vec3 pyramidTwoPosition(,,);
     pyramidTwoXForm->setPosition( pyramidTwoPosition ); 

     osgUtil::Optimizer optimizer;
     optimizer.optimize(mRoot.get());
     optimizer.reset();

     // Add the model to the scene
    // mRoot->addChild(root.get());

 }

运行效果：

http://blog.csdn.net/column/details/osgdemo.html

http://trac.openscenegraph.org/projects/osg//wiki/Support/Tutorials/BasicGeometry