export declare enum StandardMaterialAlphaMode {
    /**
     * The rendered output is fully opaque and any alpha value is ignored.
     */
    opaque = "opaque",
    /**
     * The rendered output is either fully opaque or fully transparent depending
     * on the alpha value and the specified alpha cutoff value. This mode is used
     * to simulate geometry such as tree leaves or wire fences.
     */
    mask = "mask",
    /**
     * The rendered output is combined with the background using the normal
     * painting operation (i.e. the Porter and Duff over operator). This mode is
     * used to simulate geometry such as guaze cloth or animal fur.
     */
    blend = "blend"
}