要素服务无法以三维加载

【解决办法】：
featureLayer的renderer为Renderer类，包含ClassBreaksRenderer , SimpleRenderer , UniqueValueRenderer。再往下的symbol才能使用PointSymbol3D。

renderer:{

                            type:simple,//  new SimpleRenderer

                            symbol:{

                                type: point-3d, //new PointSymbol3D()

                                symbolLayers: [{

                                    type: icon, //new IconSymbol3DLayer()

                                    resource: {

                                        href: m.png

                                    },

                                    size: 20,

                                    outline: {

                                        color: white,

                                        size: 2

                                    }

                                }],

                                verticalOffset: {

                                    screenLength: 400,

                                    maxWorldLength: 200,

                                    minWorldLength: 35

                                },

                                callout: {

                                    type: line,

                                    color: white,

                                    size: 2,

                                    border: {

                                        color: #D13470

                                    }

                                }

                            }



                        }