关于GraphicsContents的问题

brucefeng

代码如下

1.         osg::Vec3 v1(0.0,0.0,0.0);
   
2.         osg::Vec3 v2(1.0,0.0,0.0);
   
3.         osg::Vec3 v3(0.0,1.0,0.0);
   
4.         osg::Vec3 v4(0.0,0.0,1.0);
   
5. 
   
6.         osg::ref_ptr<osg::Geometry> t1 = new osg::Geometry;
   
7.         osg::ref_ptr<osg::Geometry> t2 = new osg::Geometry;
   
8.         osg::ref_ptr<osg::Geometry> t3 = new osg::Geometry;
   
9.         osg::ref_ptr<osg::Geometry> t4 = new osg::Geometry;
   
10. 
    
11.         osg::ref_ptr<osg::Vec3Array> tv1 = new osg::Vec3Array;
    
12.         osg::ref_ptr<osg::Vec3Array> tv2 = new osg::Vec3Array;
    
13.         osg::ref_ptr<osg::Vec3Array> tv3 = new osg::Vec3Array;
    
14.         osg::ref_ptr<osg::Vec3Array> tv4 = new osg::Vec3Array;
    
15.         tv1->push_back(v1);tv1->push_back(v2);tv1->push_back(v3);
    
16.         tv2->push_back(v1);tv2->push_back(v3);tv2->push_back(v4);
    
17.         tv3->push_back(v1);tv3->push_back(v2);tv3->push_back(v4);
    
18.         tv4->push_back(v2);tv4->push_back(v3);tv4->push_back(v4);
    
19. 
    
20.         t1->setVertexArray(tv1.get());t2->setVertexArray(tv2.get());
    
21.         t3->setVertexArray(tv3.get());t4->setVertexArray(tv4.get());
    
22.        
    
23.         t1->addPrimitiveSet(new osg::DrawArrays(osg::DrawArrays::TRIANGLES,0,3));
    
24.         t2->addPrimitiveSet(new osg::DrawArrays(osg::DrawArrays::TRIANGLES,0,3));
    
25.         t3->addPrimitiveSet(new osg::DrawArrays(osg::DrawArrays::TRIANGLES,0,3));
    
26.         t4->addPrimitiveSet(new osg::DrawArrays(osg::DrawArrays::TRIANGLES,0,3));
    
27. 
    
28. 
    
29.         osg::ref_ptr<osg::Geode> trian = new osg::Geode;
    
30.         trian->addDrawable(t1);trian->addDrawable(t2);
    
31.         trian->addDrawable(t3);trian->addDrawable(t4);
    
32.         osgUtil::SmoothingVisitor visitor;
    
33.         visitor.smooth(*t1);visitor.smooth(*t2);
    
34.         visitor.smooth(*t3);visitor.smooth(*t4);
    
35.         osg::ref_ptr<osg::PolygonMode> line = new osg::PolygonMode;
    
36.        
    
37.         osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
    
38.         traits->windowDecoration = true;
    
39.         traits->x = 100;
    
40.         traits->y = 100;
    
41.         traits->width = 800;
    
42.         traits->height = 600;
    
43.         traits->doubleBuffer = true;
    
44.         traits->sharedContext = 0;
    
45. 
    
46.         osg::DisplaySettings* ds = osg::DisplaySettings::instance();
    
47.         traits->alpha = ds->getMinimumNumAccumAlphaBits();
    
48.         traits->stencil = ds->getMinimumNumStencilBits();
    
49.         traits->sampleBuffers = ds->getMultiSamples();
    
50.         traits->samples = ds->getNumMultiSamples();
    
51.        
    
52.         osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());
    
53.        
    
54.         gc->setClearColor(osg::Vec4(0.2,0.5,0.0,1.0));
    
55.         gc->setClearMask(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    
56. 
    
57.         osg::ref_ptr<osg::Camera> camera = new osg::Camera;
    
58.         osg::Vec3 eye(0.0,2.0,2.0);
    
59.         osg::Vec3 center(0,-0.5,-0.5);
    
60.         osg::Vec3 up(0.0,1.0,0.0);
    
61.         osgViewer::Viewer viewer;
    
62.         viewer.setSceneData(trian.get());
    
63.        
    
64.        
    
65.         camera->setViewMatrixAsLookAt(eye,center,up);
    
66.         camera->setProjectionMatrixAsPerspective(90.0,2.0,4.0,10.0);
    
67.        
    
68. 
    
69.         camera->setGraphicsContext(gc.get());
    
70.         camera->setViewport(new osg::Viewport(10,10,700,500));
    
71.         camera->setClearColor(osg::Vec4(0.1,0.1,0.0,1.0));
    
72.         CameraEventCallBack* ecb = new CameraEventCallBack;
    
73.         //camera->setEventCallback(ecb);
    
74.         camera->setReferenceFrame(osg::Camera::ABSOLUTE_RF);
    
75.         viewer.setCamera(camera.get());
    
76.        
    
77.        
    
78.        
    
79.         viewer.setSceneData(trian.get());
    
80.         viewer.setCamera(camera);
    
81. 
    
82.        
    
83.         return viewer.run();

复制代码

使用上面的代码之后不能显示场景图形，显示效果如图：

显示效果

即使调整窗口和视图的大小也还是不能显示
当去除

1. camera->setGraphicsContext(gc.get());

复制代码

这句代码后是可以全屏显示四面体的。望指教，谢谢。

brucefeng

难道大家都没遇到过这个问题……

array

代码不全，无法判断什么；参考osgcamera例子就可以了