osg 在场景中绘制坐标轴(xyz)

//x y z font_size
osg::Geode* makeCoordinate(float a_x,float a_y,float a_z,float font_size)
{
    osg::ref_ptr<osg::Sphere> pSphereShape = new osg::Sphere(osg::Vec3(0, 0, 0), 1.0f); osg::ref_ptr<osg::ShapeDrawable> pShapeDrawable = new osg::ShapeDrawable(pSphereShape.get()); pShapeDrawable->setColor(osg::Vec4(0.0, 0.0, 0.0, 1.0)); //创建保存几何信息的对象 osg::ref_ptr<osg::Geometry> geom = new osg::Geometry(); //创建四个顶点 osg::ref_ptr<osg::Vec3Array> v = new osg::Vec3Array(); v->push_back(osg::Vec3(0.0f, 0.0f, 0.0f)); v->push_back(osg::Vec3(a_x, 0.0f, 0.0f)); v->push_back(osg::Vec3(0.0f, 0.0f, 0.0f)); v->push_back(osg::Vec3(0.0f, a_y, 0.0f)); v->push_back(osg::Vec3(0.0f, 0.0f, 0.0f)); v->push_back(osg::Vec3(0.0f, 0.0f, a_z)); geom->setVertexArray(v.get()); osg::ref_ptr<osg::Vec4Array> c = new osg::Vec4Array(); c->push_back(osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f)); c->push_back(osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f)); c->push_back(osg::Vec4(0.0f, 1.0f, 0.0f, 1.0f)); c->push_back(osg::Vec4(0.0f, 1.0f, 0.0f, 1.0f)); c->push_back(osg::Vec4(0.0f, 0.0f, 1.0f, 1.0f)); c->push_back(osg::Vec4(0.0f, 0.0f, 1.0f, 1.0f)); geom->setColorArray(c.get()); geom->setColorBinding(osg::Geometry::BIND_PER_VERTEX); //xyz geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::LINES, 0, 2)); geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::LINES, 2, 2)); geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::LINES, 4, 2)); osg::ref_ptr<osgText::Text> pTextXAuxis1 = new osgText::Text; pTextXAuxis1->setText(L"X"); pTextXAuxis1->setFont("Fonts/simhei.ttf"); pTextXAuxis1->setAxisAlignment(osgText::Text::SCREEN); pTextXAuxis1->setCharacterSize(font_size); pTextXAuxis1->setPosition(osg::Vec3(a_x, 0.0f, 0.0f)); osg::ref_ptr<osgText::Text> pTextYAuxis1 = new osgText::Text; pTextYAuxis1->setText(L"Y"); pTextYAuxis1->setFont("Fonts/simhei.ttf"); pTextYAuxis1->setAxisAlignment(osgText::Text::SCREEN); pTextYAuxis1->setCharacterSize(font_size); pTextYAuxis1->setPosition(osg::Vec3(0.0f, a_y, 0.0f)); osg::ref_ptr<osgText::Text> pTextZAuxis1 = new osgText::Text; pTextZAuxis1->setText(L"Z"); pTextZAuxis1->setFont("Fonts/simhei.ttf"); pTextZAuxis1->setAxisAlignment(osgText::Text::SCREEN); pTextZAuxis1->setCharacterSize(font_size); pTextZAuxis1->setPosition(osg::Vec3(0.0f, 0.0f, a_z)); osg::ref_ptr<osg::Geode> geode = new osg::Geode(); geode->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF); geode->getOrCreateStateSet()->setAttribute(new osg::LineWidth(3.0), osg::StateAttribute::ON); geode->addDrawable(pShapeDrawable.get()); geode->addDrawable(geom.get()); geode->addDrawable(pTextXAuxis1.get()); geode->addDrawable(pTextYAuxis1.get()); geode->addDrawable(pTextZAuxis1.get()); return geode.release(); }

 

效果图片：

 

 

 

参考：https://blog.csdn.net/sun222555888/article/details/52083413