OSG绘制几何图形

 1 void cOSG::InitSceneGraph(void)
 2 {
 3     // Init the main Root Node/Group
 4     mRoot  = new osg::Group;
 5 
 6     //// Load the Model from the model name
 7     //mModel = osgDB::readNodeFile(m_ModelName);
 8     //if (!mModel) return;
 9 
10     // Optimize the model
11     //osgUtil::Optimizer optimizer;
12     //optimizer.optimize(mModel.get());
13     //optimizer.reset();
14 
15     //// Add the model to the scene
16     //mRoot->addChild(mModel.get());
17 
18 
19     osg::Geode* pyramidGeode = new osg::Geode();
20     osg::Geometry* pyramidGeometry = new osg::Geometry();
21     pyramidGeode->addDrawable(pyramidGeometry); 
22     mRoot->addChild(pyramidGeode);
23 
24     osg::Vec3Array* pyramidVertices = new osg::Vec3Array;
25     pyramidVertices->push_back( osg::Vec3( 0, 0, 0) ); // front left
26     pyramidVertices->push_back( osg::Vec3(10, 0, 0) ); // front right
27     pyramidVertices->push_back( osg::Vec3(10,10, 0) ); // back right 
28     pyramidVertices->push_back( osg::Vec3( 0,10, 0) ); // back left 
29     pyramidVertices->push_back( osg::Vec3( 5, 5,10) ); // peak
30 
31     pyramidGeometry->setVertexArray( pyramidVertices ); 
32 
33     osg::DrawElementsUInt* pyramidBase = new osg::DrawElementsUInt(osg::PrimitiveSet::QUADS, 0);
34     pyramidBase->push_back(3);
35     pyramidBase->push_back(2);
36     pyramidBase->push_back(1);
37     pyramidBase->push_back(0);
38     pyramidGeometry->addPrimitiveSet(pyramidBase); 
39 
40     osg::DrawElementsUInt* pyramidFaceOne = new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0);
41     pyramidFaceOne->push_back(0);
42     pyramidFaceOne->push_back(1);
43     pyramidFaceOne->push_back(4);
44     pyramidGeometry->addPrimitiveSet(pyramidFaceOne);
45 
46     osg::DrawElementsUInt* pyramidFaceTwo = 
47       new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0);
48     pyramidFaceTwo->push_back(1);
49     pyramidFaceTwo->push_back(2);
50     pyramidFaceTwo->push_back(4);
51     pyramidGeometry->addPrimitiveSet(pyramidFaceTwo);
52 
53     osg::DrawElementsUInt* pyramidFaceThree = 
54       new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0);
55     pyramidFaceThree->push_back(2);
56     pyramidFaceThree->push_back(3);
57     pyramidFaceThree->push_back(4);
58     pyramidGeometry->addPrimitiveSet(pyramidFaceThree);
59 
60     osg::DrawElementsUInt* pyramidFaceFour = 
61       new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0);
62     pyramidFaceFour->push_back(3);
63     pyramidFaceFour->push_back(0);
64     pyramidFaceFour->push_back(4);
65     pyramidGeometry->addPrimitiveSet(pyramidFaceFour);
66 
67     osg::Vec4Array* colors = new osg::Vec4Array;
68     colors->push_back(osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f) ); //index 0 red
69     colors->push_back(osg::Vec4(0.0f, 1.0f, 0.0f, 1.0f) ); //index 1 green
70     colors->push_back(osg::Vec4(0.0f, 0.0f, 1.0f, 1.0f) ); //index 2 blue
71     colors->push_back(osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f) ); //index 3 white 
72     colors->push_back(osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f) ); //index 4 red
73 
74     pyramidGeometry->setColorArray(colors);
75     pyramidGeometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
76 
77     // Declare and initialize a transform node.
78     osg::PositionAttitudeTransform* pyramidTwoXForm = new osg::PositionAttitudeTransform;
79 
80     // Use the ‘addChild‘ method of the osg::Group class to
81     // add the transform as a child of the root node and the
82     // pyramid node as a child of the transform.
83     mRoot->addChild(pyramidTwoXForm);
84     pyramidTwoXForm->addChild(pyramidGeode);
85 
86     // Declare and initialize a Vec3 instance to change the
87     // position of the tank model in the scene
88     osg::Vec3 pyramidTwoPosition(15,0,0);
89     pyramidTwoXForm->setPosition( pyramidTwoPosition ); 
90 
91     osgUtil::Optimizer optimizer;
92     optimizer.optimize(mRoot.get());
93     optimizer.reset();
94 
95     // Add the model to the scene
96    // mRoot->addChild(root.get());
97 
98 }