osg学习（五十九）场景树节点典型例子

Posted 2022-02-16 hankern

osg::ref_ptr<osg::Geometry> geometry = new osg::Geometry;
osg::ref_ptr<osg::Vec3Array> vex = new osg::Vec3Array;
vex->push_back(osg::Vec3(-3.0, 0.0, 0.0));
vex->push_back(osg::Vec3(3.0, 0.0, 0.0));
vex->push_back(osg::Vec3(0.0, 5.0, 0.0));
vex->push_back(osg::Vec3(0.0, 0.0, 5.0));
geometry->setVertexArray(vex);
osg::ref_ptr<osg::Vec4Array> colors = new osg::Vec4Array;
colors->push_back(osg::Vec4(1.0, 1.0, 0.0, 0.5));
geometry->setColorArray(colors);
geometry->setColorBinding(osg::Geometry::BIND_OVERALL);
osg::ref_ptr<osg::PrimitiveSet> primitiveSet = new osg::DrawArrays(osg::PrimitiveSet::LINE_LOOP, 0, 4);
geometry->addPrimitiveSet(primitiveSet);
geode->addDrawable(geometry);