terial = customMaterial;

                // only for Debug
                window.earth = earth;
            },
            methods: {
                colorMaterialClick() {
                    myBox.appearance.material = colorMaterial;
                    this.colorMaterialShow = true;
                    this.imageMaterialShow = false;
                    this.compositeMaterialShow = false;
                    this.customMaterialShow = false;
                },
                imageMaterialC