function underground(t, i) {
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this._viewer = t;
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var n = Cesium.defaultValue(i, {});
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this._depth = Cesium.defaultValue(n.depth, 500),
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this._alpha = Cesium.defaultValue(n.alpha, .5),
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this.enable = Cesium.defaultValue(n.enable, !1)
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}
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underground.prototype._updateImageryLayersAlpha=function(e) {
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for (var t = this._viewer.imageryLayers._layers, i = 0, a = t.length; i < a; i++)
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t[i].alpha = e
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}
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underground.prototype._historyOpts =function() {
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var e = {};
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e.alpha = Cesium.clone(this._viewer.imageryLayers._layers[0] && this._viewer.imageryLayers._layers[0].alpha),
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e.highDynamicRange = Cesium.clone(this._viewer.scene.highDynamicRange),
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e.skyShow = Cesium.clone(this._viewer.scene.skyAtmosphere.show),
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e.skyBoxShow = Cesium.clone(this._viewer.scene.skyBox.show),
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e.depthTest = Cesium.clone(this._viewer.scene.globe.depthTestAgainstTerrain),
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this._viewer.scene.globe._surface && this._viewer.scene.globe._surface._tileProvider && this._viewer.scene.globe._surface._tileProvider._renderState && (e.blending = Cesium.clone(this._viewer.scene.globe._surface._tileProvider._renderState.blending)),
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this._oldViewOpts = e
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}
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underground.prototype.activate =function() {
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if (!this._enable) {
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this._enable = !0,
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this._historyOpts(),
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this._updateImageryLayersAlpha(this._alpha);
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var e = this._viewer;
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Cesium.ExpandByMars.underEarth.cullFace = !1,
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Cesium.ExpandByMars.underEarth.enable = !0,
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Cesium.ExpandByMars.underEarth.enableDepth = this._depth,
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Cesium.ExpandByMars.underEarth.enableSkirt = !0,
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e.scene.globe.depthTestAgainstTerrain = !0,
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e.scene.highDynamicRange = !1,
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e.scene.skyAtmosphere.show = !1,
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e.scene.skyBox.show = !1,
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e.scene.globe._surface._tileProvider && e.scene.globe._surface._tileProvider._renderState && e.scene.globe._surface._tileProvider._renderState.blending /*&& (e.scene.globe._surface._tileProvider._renderState.blending.enabled = !0,
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e.scene.globe._surface._tileProvider._renderState.blending.equationRgb = Cesium.BlendEquation.ADD,
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e.scene.globe._surface._tileProvider._renderState.blending.equationAlpha = Cesium.BlendEquation.ADD,
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e.scene.globe._surface._tileProvider._renderState.blending.functionSourceAlpha = Cesium.BlendFunction.ONE,
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e.scene.globe._surface._tileProvider._renderState.blending.functionSourceRgb = Cesium.BlendFunction.ONE,
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e.scene.globe._surface._tileProvider._renderState.blending.functionDestinationAlpha = Cesium.BlendFunction.ZERO,
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e.scene.globe._surface._tileProvider._renderState.blending.functionDestinationRgb = Cesium.BlendFunction.ZERO)*/
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}
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}
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underground.prototype.disable=function() {
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if (this._enable) {
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this._enable = !1,
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this._updateImageryLayersAlpha(this._oldViewOpts.alpha);
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var e = this._viewer;
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Cesium.ExpandByMars.underEarth.cullFace = void 0,
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Cesium.ExpandByMars.underEarth.enable = !1,
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Cesium.ExpandByMars.underEarth.enableDepth = 0,
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Cesium.ExpandByMars.underEarth.enableSkirt = !1,
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e.scene.globe.depthTestAgainstTerrain = this._oldViewOpts.depthTest,
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e.scene.skyBox.show = this._oldViewOpts.skyBoxShow,
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e.scene.highDynamicRange = this._oldViewOpts.highDynamicRange,
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e.scene.skyAtmosphere.show = this._oldViewOpts.skyShow/*,
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void 0 != this._oldViewOpts.blending && (e.scene.globe._surface._tileProvider._renderState.blending = this._oldViewOpts.blending)*/
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}
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}
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underground.prototype.destroy=function(){
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delete this._viewer,
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delete this._alpha,
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delete this._depth,
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delete this._enable,
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delete this._oldViewOpts
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}
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