Examples osggeometry

1.访问顶点索引

void printPrimitiveIndices(const std::string& name, osg::Drawable& drawable)
{std::cout<<name<<std::endl;osg::TemplatePrimitiveIndexFunctor<PrimitiveIndexPrint> pf;drawable.accept(pf);std::cout<<std::endl;
}

2.访问顶点

void printPrimitiveIndices(const std::string& name, osg::Drawable& drawable)
{std::cout<<name<<std::endl;osg::TemplatePrimitiveIndexFunctor<PrimitiveIndexPrint> pf;drawable.accept(pf);std::cout<<std::endl;
}

3. osg::Geode 为叶子节点

osg::Geometry 为几何体

setVertexArray 设置顶点数组

setColorArray 设置颜色数组

setNormalArray 设置法向量数组

addPrimitiveSet 设置几何图形形状模式，开始顶点，顶点数量

addDrawable 叶子节点添加几何图形

4.通过共享指针指向一份内存，达到共用目的节省内存

 osg::ref_ptr<osg::Vec4Array> shared_colors = new osg::Vec4Array;shared_colors->push_back(osg::Vec4(1.0f,1.0f,0.0f,1.0f));

5.直接设置共享指针指向的地址

 polyGeom->setColorArray(shared_colors.get(), osg::Array::BIND_OVERALL);

6.几何体中可设置多个几何图形

polyGeom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::TRIANGLES,0,6));
polyGeom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::TRIANGLE_STRIP,6,6));
polyGeom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::TRIANGLE_FAN,12,5));

7.状态集设置属性

stateSet>setAttributeAndModes(polygonStipple,osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);

8.设置节点灯光开关

 geode->getOrCreateStateSet()->setMode(GL_LIGHTING,osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED);

9.设置节点回调函数

transform->setUpdateCallback(new MyTransformCallback(1.0f));

10.纹理坐标顺序开始我看的对不上几何体的顶点坐标，后来才明白绘制方式是osg::PrimitiveSet::TRIANGLE_STRIP

//顶点坐标
osg::Vec3 myCoords[] =
{osg::Vec3(-1.22908f,0.0f,1.0f),osg::Vec3(-1.22908f,0.0f,-1.0f),osg::Vec3(1.22908f,0.0f,-1.0f),osg::Vec3(1.22908f,0.0f,1.0f)
};//纹理坐标
osg::Vec2 myTexCoords[] ={osg::Vec2(0,1),osg::Vec2(0,0),osg::Vec2(1,0),osg::Vec2(1,1)
};//几何体绘制顶点顺序unsigned short myIndices[] ={0,1,3,2};

还是用osg::TexGen自动生成纹理坐标吧

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