水牛模型身上融合一个osg::Stencil长方形轮廓怎么没效果？

五十载

1. #include <osgViewer/Viewer>
   
2. #include <osgDB/ReadFile>
   
3. #include <osg/geode>
   
4. #include <osg/LineWidth>
   
5. #include <osgUtil/Tessellator>
   
6. #include <osg/Stencil>
   
7. #include <osg//ComputeBoundsVisitor>
   
8. #include <osgapex/cleardrawable>
   
9. #include <osg/Depth>
   
10. #include <osg/MatrixTransform>
    
11. 
    
12. #pragma comment(lib,"OpenThreadsd.lib")
    
13. #pragma comment(lib,"osgd.lib")
    
14. #pragma comment(lib,"osgDBd.lib")
    
15. #pragma comment(lib,"osgAPExd.lib")
    
16. #pragma comment(lib,"osgGAd.lib")
    
17. #pragma comment(lib,"osgUtild.lib")
    
18. #pragma comment(lib,"osgTextd.lib")
    
19. #pragma comment(lib,"osgSimd.lib")
    
20. #pragma comment(lib,"osgViewerd.lib")
    
21. 
    
22. int _tmain(int argc, _TCHAR* argv[])
    
23. {
    
24.         osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer;
    
25.         osg::ref_ptr<osg::Group> g_Root = new osg::Group;
    
26.         osg::ref_ptr<osg::Node> pNode = osgDB::readNodeFile("cow.osg");
    
27.         osg::ref_ptr<osg::Group> g_depth = new osg::Group;
    
28.         osg::ref_ptr<osg::MatrixTransform> setMat = new osg::MatrixTransform;
    
29.         setMat->setMatrix(osg::Matrixd::scale(16,1,16));
    
30.         setMat->addChild(pNode);
    
31. 
    
32.         osg::ref_ptr<osg::Vec3Array> V3a;
    
33.         V3a = new osg::Vec3Array;
    
34.         V3a->push_back(osg::Vec3(-0.1f,0.1f,-0.1f));
    
35.         V3a->push_back(osg::Vec3(0.1f,0.1f,-0.1f));
    
36.         V3a->push_back(osg::Vec3(0.1f,0.1f,0.1f));
    
37.         V3a->push_back(osg::Vec3(-0.1f,0.1f,0.1f));
    
38.        
    
39.         //pNode
    
40.         osg::ref_ptr<osg::Geode> ClipPlane = new osg::Geode;
    
41.         osg::ref_ptr<osg::Geometry> top_cap = new osg::Geometry;
    
42.         ClipPlane->addDrawable(top_cap);
    
43.         top_cap->setVertexArray(V3a);
    
44. 
    
45.         osg::Vec4Array* colors = new osg::Vec4Array;
    
46.         colors->push_back(osg::Vec4(1,0,0,1));
    
47.         top_cap->setColorArray(colors);
    
48.         top_cap->setColorBinding(osg::Geometry::BIND_OVERALL);
    
49. 
    
50.         top_cap->addPrimitiveSet( new osg::DrawArrays(
    
51.                 osg::PrimitiveSet::LINE_LOOP,
    
52.                 0,V3a->size()));
    
53. 
    
54.         osgUtil::Tessellator tess;
    
55.         tess.setTessellationType( osgUtil::Tessellator::TESS_TYPE_GEOMETRY );
    
56.         tess.setWindingType( osgUtil::Tessellator::TESS_WINDING_POSITIVE );
    
57.         tess.retessellatePolygons(*(top_cap.get()));
    
58. 
    
59.         osg::Stencil* stencil = new osg::Stencil;
    
60.         stencil->setFunction(osg::Stencil::ALWAYS, 1, ~0u);
    
61.         stencil->setOperation(osg::Stencil::KEEP, osg::Stencil::KEEP, osg::Stencil::INCR);
    
62.         int ref = stencil->getFunctionRef();
    
63.         unsigned int mask = stencil->getFunctionMask();
    
64.         ClipPlane->getOrCreateStateSet()->setAttributeAndModes(stencil, osg::StateAttribute::ON);
    
65.         ClipPlane->getOrCreateStateSet()->setAttributeAndModes(new osg::Depth(osg::Depth::LESS, 0, 1, false), osg::StateAttribute::ON);
    
66.         ClipPlane->getOrCreateStateSet()->setMode(GL_CULL_FACE, osg::StateAttribute::OFF);
    
67.         ClipPlane->getOrCreateStateSet()->setAttributeAndModes(new osg::ColorMask(false, false, false, false));
    
68.         ClipPlane->setCullingActive(false);
    
69.         ClipPlane->getOrCreateStateSet()->setRenderBinDetails(-2, "RenderBin");
    
70.         g_depth->addChild(ClipPlane);
    
71. 
    
72.         osg::Geode* clearDepthNode = new osg::Geode;
    
73.         clearDepthNode->addDrawable(new osgAPEx::ClearDrawable(GL_DEPTH_BUFFER_BIT));
    
74.         clearDepthNode->getOrCreateStateSet()->setRenderBinDetails(-1, "RenderBin");
    
75.         g_depth->addChild(clearDepthNode);
    
76. 
    
77.         stencil = new osg::Stencil;
    
78.         stencil->setFunction(osg::Stencil::NOTEQUAL, 1, 1);
    
79.         pNode->getOrCreateStateSet()->setAttributeAndModes(stencil, osg::StateAttribute::ON);   
    
80. 
    
81.         g_Root->addChild(g_depth);
    
82.         g_Root->addChild(setMat);
    
83.         viewer->setSceneData(g_Root);
    
84.         viewer->run();
    
85.         return 0;
    
86. }

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