函数 createDefaultProps

返回 {
    contourColor: [number, number, number, number];
    contourSpacing: number;
    contourWidth: number;
    elevationParam: ReactiveVariable<undefined | { [xx: string]: any }>;
    enableContour: boolean;
    shadingMode: undefined | "none" | "elevation" | "slope" | "aspect";
    show: undefined | boolean;
}