Cesium中宾利系统提供的电厂设计模型应用

// Power Plant design model provided by Bentley Systems
var viewer = new Cesium.Viewer('cesiumContainer');
var scene = viewer.scene;    //获取当前视图范围

var tileset = scene.primitives.add( //加载一个3Dtiles数据
    new Cesium.Cesium3DTileset({  
        url: Cesium.IonResource.fromAssetId(8564)  //url值为固定值(官方封装)
    })
);

tileset.readyPromise.then(function(tileset) {   //数据渲染
    viewer.zoomTo(tileset, new Cesium.HeadingPitchRange(0.5, -0.2, tileset.boundingSphere.radius * 4.0)); //设置相机，给数据设置标题，范围
}).otherwise(function(error) {  //否则打印错误日志
    console.log(error);
});

tileset.colorBlendMode = Cesium.Cesium3DTileColorBlendMode.REPLACE;  //定义用于在目标颜色和图元的源颜色之间混合的不同模式，HIGHLIGHT将源颜色乘以目标颜色REPLACE将源颜色替换为目标颜色MIX将源颜色和目标颜色混合在一起。

var selectedFeature;
var picking = false;

Sandcastle.addToggleButton('Per-feature selection', false, function(checked) { //是否使用功能
    picking = checked;  
    if (!picking) {
        unselectFeature( );
    }
});

function selectFeature(feature) {   //添加单击事件
    var element = feature.getProperty('element');
    setElementColor(element, Cesium.Color.YELLOW);
    selectedFeature = feature;
}

function unselectFeature(feature) {  //确定之前选择得要素
    if (!Cesium.defined(feature)) {
        return;
    }
    var element = feature.getProperty('element');
    setElementColor(element, Cesium.Color.WHITE);
    if (feature === selectedFeature) {
        selectedFeature = undefined;
    }
}

var handler = new Cesium.ScreenSpaceEventHandler(scene.canvas);   //处理用户输入事件，鼠标点击事件
handler.setInputAction(function(movement) {
    if (!picking) {
        return;
    }

    var feature = scene.pick(movement.endPosition);  //判断结束位置

    unselectFeature(selectedFeature);

    if (feature instanceof Cesium.Cesium3DTileFeature) {  //判断选择是否为Cesium3DTileFeature
        selectFeature(feature);
    }
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);  //用于对鼠标事件进行分类，表示鼠标中键按下事件。

// 在这个tileset中，每个特性都有一个“element”属性，它是一个全局id。
// 此属性用于跨不同的分幅和lod关联要素。
// 解决方法，直到3d tiles具有全局批处理id的概念：https://github.com/analyticalgraphicsinc/3d-tiles/issues/265
var elementMap = {}; // 建立元素到要素的映射
var hiddenElements = [112001, 113180, 131136, 113167, 71309, 109652, 111178, 113156, 113170, 124846, 114076, 131122, 113179, 114325, 131134, 113164, 113153, 113179, 109656, 114095, 114093, 39225, 39267, 113149, 113071, 112003, 39229, 113160, 39227, 39234, 113985, 39230, 112004, 39223];   //隐藏要素

function getElement(feature) {   //获取要素
    return parseInt(feature.getProperty('element'), 10);
}

function setElementColor(element, color) {   //设置每一个要素得颜色
    var featuresToColor = elementMap[element];
    var length = featuresToColor.length;
    for (var i = 0; i < length; ++i) {
        var feature = featuresToColor[i];
        feature.color = Cesium.Color.clone(color, feature.color);
    }
}

function unloadFeature(feature) {   //卸载功能
    unselectFeature(feature);     //取消选择
    var element = getElement(feature);
    var features = elementMap[element];
    var index = features.indexOf(feature);
    if (index > -1) {
        features.splice(index, 1);
    }
}

function loadFeature(feature) {
    var element = getElement(feature);
    var features = elementMap[element];
    if (!Cesium.defined(features)) {
        features = [];
        elementMap[element] = features;
    }
    features.push(feature);

    if (hiddenElements.indexOf(element) > -1) {
        feature.show = false;
    }
}

function processContentFeatures(content, callback) {  //处理内容功能
    var featuresLength = content.featuresLength;
    for (var i = 0; i < featuresLength; ++i) {
        var feature = content.getFeature(i);
        callback(feature);
    }
}

function processTileFeatures(tile, callback) {  //处理瓦片
    var content = tile.content;
    var innerContents = content.innerContents;
    if (Cesium.defined(innerContents)) {
        var length = innerContents.length;
        for (var i = 0; i < length; ++i) {
            processContentFeatures(innerContents[i], callback);
        }
    } else {
        processContentFeatures(content, callback);
    }
}

tileset.tileLoad.addEventListener(function(tile) {  //添加监听事件，瓦片加载事件。
    processTileFeatures(tile, loadFeature);
});

tileset.tileUnload.addEventListener(function(tile) {  //添加监听事件，瓦片加载事件。
    processTileFeatures(tile, unloadFeature);
});

宾利 系统 提供的电厂设计模型

免责声明：本文系网络转载或改编，未找到原创作者，版权归原作者所有。如涉及版权，请联系删