返回Scene对象的存储类型。语法cstring ST_Type(scene sceneObject);参数参数名称描述sceneObjectscene对象。描述返回Scene对象的存储类型，当前支持类型有: gltf/osg。示例select ST_Type(ST_sceneFromText('{"type" : "gltf", "lod" : 1 , "content" : {"accessors":...}}')); -------- gltf