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<p>如何在CZML中指定橢球的顏色？當(dāng)我在JavaScript中為檢視器新增實(shí)體時(shí)，以下程式碼片段有效：</p> <pre class="brush:php;toolbar:false;">let redEllipsoid = viewer.entities.add({ "name": "red ellipsoid", "position": Cesium.Cartesian3.fromDegrees(-114.0, 40.0, 300000.0), "ellipsoid": { "radii": new Cesium.Cartesian3(200000.0, 200000.0, 300000.0), "material": Cesium.Color.RED.withAlpha(0.5), "outline": 真, "outlineColor": Cesium.Color.BLACK } });</pre> <p>這個(gè)程式碼片段也有效：</p> <pre class="brush:php;toolbar:false;">let redEllipsoid = viewer.entities.add({ "name": "red ellipsoid", "position": { x: -2083516.9683773473, y: -4679655.730028949, z: 4270821.855106338 }, "ellipsoid": { "radii": { x: 200000, y: 200000, z: 300000 }, "material": Cesium.Color.RED.withAlpha(0.5), "outline": 真, "outlineColor": { red: 0, green: 0, blue: 0, alpha: 1 } } });</pre> <p>但是這個(gè)程式碼片段無(wú)效（傳回預(yù)設(shè)的白色橢球）：</p> <pre class="brush:php;toolbar:false;">let redEllipsoid = viewer.entities.add({ "name": "red ellipsoid", "position": { x: -2083516.9683773473, y: -4679655.730028949, z: 4270821.855106338 }, "ellipsoid": { "radii": { x: 200000, y: 200000, z: 300000 }, "material": { "solidColor": { "color": { "rgba": [1, 0, 0, 0.5] } } }, "outline": 真, "outlineColor": { red: 0, green: 0, blue: 0, alpha: 1 } } });</pre> <p>這個(gè)程式碼片段也無(wú)效（傳回預(yù)設(shè)的白色橢球）：</p> <pre class="brush:php;toolbar:false;">let redEllipsoid = viewer.entities.add({ "name": "red ellipsoid", "position": { x: -2083516.9683773473, y: -4679655.730028949, z: 4270821.855106338 }, "ellipsoid": { "radii": { x: 200000, y: 200000, z: 300000 }, "material": { "color": { red: 1, green: 0, blue: 0, alpha: 0.5 } }, "outline": 真, "outlineColor": { red: 0, green: 0, blue: 0, alpha: 1 } } });</pre> <p>這個(gè)程式碼片段也無(wú)效（傳回預(yù)設(shè)的白色橢球）：</p> <pre class="brush:php;toolbar:false;">let redEllipsoid = viewer.entities.add({ "name": "red ellipsoid", "position": { x: -2083516.9683773473, y: -4679655.730028949, z: 4270821.855106338 }, "ellipsoid": { "radii": { x: 200000, y: 200000, z: 300000 }, "material": { red: 1, green: 0, blue: 0, alpha: 0.5 }, "outline": 真, "outlineColor": { red: 0, green: 0, blue: 0, alpha: 1 } } });</pre> <p>我感到困惑，因?yàn)樵贑esium加載後將<code>Cesium.Color.RED.withAlpha(0.5)</code> 輸入控制臺(tái)會(huì)返回<code>ne?{red: 1, green: 0, blue: 0, alpha: 0.5}</code>。人們會(huì)期望給定靜態(tài)成員指定的物件會(huì)起作用...</p> <p>這是 <code>"material"</code> 的類型。由於它是一個(gè)沒(méi)有屬性的抽象類，我是否無(wú)法透過(guò)CZML指定它？如果設(shè)定橢球的顏色只能透過(guò)後處理來(lái)完成，那將是非常麻煩的，因?yàn)槲蚁Ｍ軌螂x線進(jìn)行大量的處理，然後只需在瀏覽器中載入CZML。 </p> <p>編輯：CZML文件很難找到和導(dǎo)航，但直接的答案都在那裡：</p> <p>請(qǐng)參閱CZML文件的<code>Ellipsoid</code> 頁(yè)面、<code>Material</code> 頁(yè)面、<code>SolidColorMaterial</code> 頁(yè)面、<code>SolidColorMaterial</code> 頁(yè)面、<code>SolidColorMaterial</code> 頁(yè)面、< ; 頁(yè)面，以及可選的<code>RgbaValue</code> 頁(yè)面。它的格式是一個(gè)GitHub wiki，每個(gè)專案都有一個(gè)頁(yè)面，不幸的是，大部分文件專案都隱藏起來(lái)，直到你點(diǎn)擊「顯示128個(gè)更多頁(yè)面」。 </p>

const czml = [
  {
    id: "document",
    version: "1.0",
  },
  {
    "id": "red ellipsoid",
    "name": "red ellipsoid",
    "position": {
      "cartesian": [
        -2083516.9683773473,
        -4679655.730028949,
        4270821.855106338
      ]
    },
    "ellipsoid": {
      "radii": {
        "cartesian": [
          200000,
          200000,
          300000
        ]
      },
      "material": {
        "solidColor": {
          "color": {
            "rgba": [255, 0, 0, 128]
          }
        }
      },
      "outline": true,
      "outlineColor": {
        red: 0,
        green: 0,
        blue: 0,
        alpha: 1
      }
    }    
  },
];

const viewer = new Cesium.Viewer("cesiumContainer");
const dataSourcePromise = Cesium.CzmlDataSource.load(czml);
viewer.dataSources.add(dataSourcePromise);
viewer.zoomTo(dataSourcePromise);