CesiumJs+ThreeJs实测_cesium three.js 结合-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_36266612/article/details/88943501

本文介绍了如何将CesiumJS和ThreeJS的场景结合显示，包括关闭Cesium的自动渲染、调整渲染频率、同步相机位置、处理坐标差异以及解决模型显示问题。通过实例演示了在Cesium上同时展示Cesium图形和ThreeJS图形的方法，遇到的问题包括ThreeJS版本不兼容、模型位置变换和模型颜色显示异常等。

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原帖：https://blog.youkuaiyun.com/zhishiqu/article/details/79077883
跟着原贴做了一下three和cesium 的结合，代码稍微改动了点，记录一下。完整代码附在最后。
思路：
1.要把cesiumjs和threejs的场景同时显示，所以需要创建两个容器，分别用于显示cesium的场景和three的场景，两个场景要重合；
2.将cesium和three的渲染频率调成一致；
3.将cesium和three的相机位置角度等调成一致。
4.将three里的图形位置调整为在地球表面
具体实现：
1.初始化cesium
cesium初始化时，要将它的自动渲染关掉（即useDefaultRenderLoop属性调整为false）

            cesium.viewer = new Cesium.Viewer("cesiumContainer", {
                useDefaultRenderLoop: false,           //关闭自动渲染
                selectionIndicator: false,
                homeButton: false,
                sceneModePicker: false,
                navigationHelpButton: false,
                animate: false,
                timeline: false,
                fullscreenButton: false,
                navigationInstructionsInitiallyVisible: false,
                allowTextureFilterAnisotropic: false,
                contextOptions: {
                    webgl: {
                        alpha: false,
                        antialias: true,
                        preserveDrawingBuffer: true,
                        failIfMajorPerformanceCaveat: false,
                        depth: true,
                        stencil: false,
                        anialias: false
                    }
                },
                targetFrameRate: 60,
                resolutionScale: 0.1,
                orderIndependentTranslucency: true,
                // creditContainer:"CreditDisplay",
                // imageeryProvider: googlemap,   //谷歌地图
                baseLayerPicker: true,
                geocoder: false,
                automaticallyTrackDataSourceClocks: false,
                dataSources: null,
                clock: null,
                terrainShadows: Cesium.ShadowMode.DISABLED
            });

2.初始化three

           let fov = 45;
            let width = window.innerWidth;
            let height = window.innerHeight;
            let aspect = width / height;
            let near = 1;
            let far = 10 * 1000 * 1000; // needs to be far to support Cesium's world-scale rendering

            three.scene = new THREE.Scene();
            three.camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
            three.renderer = new THREE.WebGLRenderer({ alpha: true });
            // let axis=new THREE.AxesHelper(1000*1000*1000);
            // three.scene.add(axis);
            ThreeContainer.appendChild(three.renderer.domElement);

3.调整three和cesium的渲染频率
手动开启cesium和three的渲染，并放进一个渲染频率里。

  function loop() {
            requestAnimationFrame(loop);
            renderCesium();  //渲染cesium
            renderThree();   //渲染three
        }

        function renderCesium() {
            cesium.viewer.render();
        }

        function renderThree() {
           var width = ThreeContainer.clientWidth;
            var height = ThreeContainer.clientHeight;
            three.renderer.setSize(width, height);
            three.renderer.render(three.scene, three.camera);
        }

4.调整相机一致
这里使用的cesium的相机为主相机，使three的相机与cesium保持一致即可。
由于相机的位置一直在变换，所以讲相机位置调整放进每一帧的渲染中。

        function renderCamera(){
            // register Three.js scene with Cesium
            three.camera.fov = Cesium.Math.toDegrees(cesium.viewer.camera.frustum.fovy) // ThreeJS FOV is vertical
            three.camera.updateProjectionMatrix();
           
            // Clone Cesium Camera projection position so the
            // Three.js Object will appear to be at the same place as above the Cesium Globe

            three.camera.matrixAutoUpdate = false;
            var cvm = cesium.viewer.camera.viewMatrix;
            var civm = cesium.viewer.camera.inverseViewMatrix;
            three.camera.matrixWorld.set(
                civm[0], civm[4], civm[8], civm[12],
                civm[1], civm[5], civm[9], civm[13],
                civm[2], civm[6], civm[10], civm[14],
                civm[3], civm[7], civm[11], civm[15]
            );
            three.camera.matrixWorldInverse.set(
                cvm[0], cvm[4], cvm[8], cvm[12],
                cvm[1], cvm[5], cvm[9], cvm[13],
                cvm[2], cvm[6], cvm[10], cvm[14],
                cvm[3], cvm[7], cvm[11], cvm[15]
            );
            three.camera.lookAt(new THREE.Vector3(0, 0, 0));

            var width = ThreeContainer.clientWidth;
            va