输出GLTF结构对象。语法text ST_AsGLTF(scene sceneObject);参数参数名称描述sceneObjectscene对象。描述将一个scene对象输出为GLTF字符串。支持将osg对象输出为GLTF。示例SELECT ST_AsGLTF(ST_sceneFromText('{"type" : "gltf", "content" : {"accessors":...}}')); -------------- {"accessors":...}}