OSG使用模板缓存

参考帖子：

https://blog.csdn.net/csxiaoshui/article/details/23457273

osg::Geometry *lineStripGeometry = new osg::Geometry;
    osg::Vec3Array *lineVertexArray = new osg::Vec3Array;
    double dRadius = 0.1;
    for (float angle = 0.0; angle < 400.0; angle += 0.1)
    {
        lineVertexArray->push_back(osg::Vec3(dRadius * cos(angle), dRadius * sin(angle), 0));
        dRadius *= 1.002;
    }
    osg::Vec4Array *lineColorArray = new osg::Vec4Array;
    lineColorArray->push_back(osg::Vec4(1.0, 1.0, 1.0, 1.0));
    lineStripGeometry->setVertexArray(lineVertexArray);
    lineStripGeometry->setColorArray(lineColorArray);
    //OSG 3.2之后的版本在setColorArray中设置绑定方式
    lineStripGeometry->setColorBinding(osg::Geometry::BIND_OVERALL);
    lineStripGeometry->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::LINE_STRIP, 0, lineVertexArray->size()));
    lineStripGeometry->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
 
    //添加模板测试
        osg::Stencil *lineStripStencil = new osg::Stencil;
    lineStripStencil->setFunction(osg::Stencil::NEVER, 0x0, 0x0);
    lineStripStencil->setOperation(osg::Stencil::INCR, osg::Stencil::INCR, osg::Stencil::INCR);
    lineStripGeometry->getOrCreateStateSet()->setAttributeAndModes(lineStripStencil);
    //////////////////////////////////////////////////////////////////////////
 
    osg::Geometry *quadGeometry = new osg::Geometry;
    
    osg::Vec3Array *quadVertexArray = new osg::Vec3Array;
    quadVertexArray->push_back(osg::Vec3(0, 0, 0));
    quadVertexArray->push_back(osg::Vec3(25, 0, 0));
    quadVertexArray->push_back(osg::Vec3(25, 25, 0));
    quadVertexArray->push_back(osg::Vec3(0, 25, 0));
 
    osg::Vec4Array *quadColorArray = new osg::Vec4Array;
    quadColorArray->push_back(osg::Vec4(0.0, 1.0, 1.0, 1.0));
 
    quadGeometry->setVertexArray(quadVertexArray);
    quadGeometry->setColorArray(quadColorArray);
    quadGeometry->setColorBinding(osg::Geometry::BIND_OVERALL);
    quadGeometry->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 0, 4));
    quadGeometry->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
 
    osg::Stencil *quadStencil = new osg::Stencil;
    quadStencil->setFunction(osg::Stencil::NOTEQUAL, 0x1, 0x1);
    quadStencil->setOperation(osg::Stencil::KEEP, osg::Stencil::KEEP, osg::Stencil::KEEP);
    quadGeometry->getOrCreateStateSet()->setAttributeAndModes(quadStencil);
    
    osg::Geode *geode = new osg::Geode;
    geode->addDrawable(lineStripGeometry);
    geode->addDrawable(quadGeometry);
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作者：csxiaoshui 
来源：CSDN 
原文：https://blog.csdn.net/csxiaoshui/article/details/23457273 
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