Cesium acquaintance of model

Learn the basics of the model of Cesium.

#primitve way to load model

// Cesium.Transforms.eastNorthUpToFixedFrame to create a latitude and longitude as the origin enu (east-north-up) local coordinate system. 
varmodelmatrix = Cesium.Transforms.eastNorthUpToFixedFrame (Cesium.Cartesian3.fromDegrees (118,31,1000)); 
varModel =viewer.scene.primitives.add (
    Cesium.Model.fromGltf ({
        URL: "../ Data / Models /CesiumAir/Cesium_Air.glTF ",
        modelMatrix: modelmatrix,
　　　　// model size factor
        Scale:100,
　　　　// clipping plane
        clippingPlanes: clippingplans           
    }));

# Model sports show

//设置开始时间
var startTime = new Cesium.JulianDate.now();
//加载后activeAnimations.addAll({})
Cesium.when(model.readyPromise).then(function(model){
    model.activeAnimations.addAll({
//the style of thr model movement,thiS MIRRORED_REPEAT style means "moving clockwise and then moving anti-clockwise" 
        loop:Cesium.ModelAnimationLoop.MIRRORED_REPEAT,
        startTime:startTime,
　　　　//stopTime: startTime,stoptime(seconds),create new time (new Cesium.JulianDate())　　　　
        stopTime:Cesium.JulianDate.addSeconds(startTime,10,new Cesium.JulianDate())
    })
});

#clippingPlane

the core  :ax+by+cz=d; a,b,c,d is four parameters

try to understand this by mathmatics

var clippingPlane= new Cesium.ClippingPlane(new Cesium.Cartesian3(0,1,0),0);//(a,b,c),d
var clippingplans = new Cesium.ClippingPlaneCollection({
    planes:[clippingPlane]
    });

 

#pick the model

var handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);
handler.setInputAction(function(movement){
    var pick = scene.pick(movement.endPosition);
    if (Cesium.defined(pick) && Cesium.defined(pick.node) ) {
        console.log('node: ' + pick.node.name + '. mesh: ' + pick.mesh.name);
    }
},Cesium.ScreenSpaceEventType.MOUSE_MOVE)