setAnisotropy(anisotropy) {
        anisotropy = isNaN(anisotropy) ? this.parameters.anisotropy : anisotropy;

        if(this.parameters.anisotropy !== anisotropy) {
            this.parameters.anisotropy = anisotropy;
            this.parameters._shouldUpdate = true;
        }
    }
Sets the texture anisotropy

     params:
     @anisotropy (int): Texture anisotropy value
*