如何将地球模型某个节点挖方一个长方形呀？

颂鼎

1. 
   
2.         stencil = new osg::Stencil;
   
3.         stencil->setFunction(osg::Stencil::NOTEQUAL, 1, 1);
   
4.         m_Earth->getOrCreateStateSet()->setAttributeAndModes(stencil, osg::StateAttribute::ON);        //不行呀
   

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cenfer

融合，并调整渲染级别

颂鼎

cenfer 发表于 2014-8-29 19:08
融合，并调整渲染级别

下面实现哪里不对呀，咋没效果呢???

1. 
   
2.         osg::ref_ptr<osg::Geode> m_clipPlane = new osg::Geode;
   
3.         (主节点)m_Group->addChild(m_clipPlane);
   
4.         osg::ref_ptr<osg::Geometry> top_cap = new osg::Geometry;
   
5.         m_clipPlane->addDrawable(top_cap);
   
6.         top_cap->setVertexArray(pts);
   
7. 
   
8.         osg::Vec4Array* colors = new osg::Vec4Array;
   
9.         colors->push_back(osg::Vec4(1,0,0,1));
   
10.         top_cap->setColorArray(colors);
    
11.         top_cap->setColorBinding(osg::Geometry::BIND_OVERALL);
    
12. 
    
13.         top_cap->addPrimitiveSet( new osg::DrawArrays(
    
14.                 osg::PrimitiveSet::LINE_LOOP,
    
15.                 0,pts->size()));
    
16. 
    
17.         osgUtil::Tessellator tess;
    
18.         tess.setTessellationType( osgUtil::Tessellator::TESS_TYPE_GEOMETRY );
    
19.         tess.setWindingType( osgUtil::Tessellator::TESS_WINDING_POSITIVE );
    
20.         tess.retessellatePolygons( *(top_cap.get()) );
    
21. 
    
22.         osg::Stencil* stencil = new osg::Stencil;
    
23.         stencil->setFunction(osg::Stencil::ALWAYS, 1, ~0u);
    
24.         stencil->setOperation(osg::Stencil::KEEP, osg::Stencil::KEEP, osg::Stencil::INCR);
    
25.         int ref = stencil->getFunctionRef();
    
26.         unsigned int mask = stencil->getFunctionMask();
    
27.         m_clipPlane->getOrCreateStateSet()->setAttributeAndModes(stencil, osg::StateAttribute::ON);
    
28.         m_clipPlane->getOrCreateStateSet()->setAttributeAndModes(new osg::Depth(osg::Depth::LESS, 0, 1, false), osg::StateAttribute::ON);
    
29.         m_clipPlane->getOrCreateStateSet()->setMode(GL_CULL_FACE, osg::StateAttribute::OFF);
    
30.         m_clipPlane->getOrCreateStateSet()->setAttributeAndModes(new osg::ColorMask(false, false, false, false));
    
31.         m_clipPlane->setCullingActive(false);
    
32.         m_clipPlane->getOrCreateStateSet()->setRenderBinDetails(-9, "RenderBin");
    
33. 
    
34. 
    
35.         osg::Geode* clearDepthNode = new osg::Geode;
    
36.         clearDepthNode->addDrawable(new osgAPEx::ClearDrawable(GL_DEPTH_BUFFER_BIT));
    
37.         clearDepthNode->getOrCreateStateSet()->setRenderBinDetails(-8, "RenderBin");
    
38.         (主节点)m_Group->addChild(clearDepthNode);
    
39. 
    
40.         stencil = new osg::Stencil;
    
41.         stencil->setFunction(osg::Stencil::NOTEQUAL, 1, 1);
    
42.         (地球节点)m_Earth->getOrCreateStateSet()->setAttributeAndModes(stencil, osg::StateAttribute::ON);       
    

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