OSG绘制几何图形

时间：2024-04-15 17:35:21

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：

OSG绘制几何图形

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

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

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