3D model downloading and animation control

3D model download and animation control

1. Model download address

1. 3D Warehouse https://3dwarehouse.sketchup.com/

2. Sketchfab https://sketchfab.com/

3. STK Model download ：STK V11.2 Versions and above provide CZML Export function , The model service address will be filled in when exporting , The default is http://assets.agi.com/models/

Exporting CZML When you file STK The corresponding model address will be automatically associated according to the model set by each object in the scene （ Is limited to STK Desktop built-in 3D model ）. Then you can open CZML File to view the specific model address , Download manually , Such as http://assets.agi.com/models/f-22a_raptor.gltf

According to STK Self contained mdl Model to write NodeJS The script automatically downloads the corresponding gltf Model

/** *  download AGI Three dimensional model  */

//  File download   Required basic classes 
var fs = require("fs");
var path = require("path");
var request = require("request");

//  Create a folder Directory   Determine whether the file is created 
var dirPath = path.join(__dirname, "file");
if (!fs.existsSync(dirPath)) {
    
  fs.mkdirSync(dirPath);
  console.log(" Folder created successfully ");
} else {
    
  console.log(" Folder already exists ");
}

//  Read the local file directory （STK The installation directory ）
const readDir = "D:\\Program Files\\AGI\\STK 11\\STKData\\VO\\Models\\Land";
fs.readdir(readDir, (err, files) => {
    
  if (err) {
    
    console.log(" Failed to read file ");
  }
  console.log(files);
  files.forEach((item) => {
    
    //  The filter suffix is gif The file of 
    let gifReg = /gif$/;
    if (gifReg.test(item)) {
    
      console.log(item);
      //  Intercept model name 
      let modelName = item.slice(0, item.length - 4) + ".gltf";
      let url = "https://assets.agi.com/models/" + modelName;
      let stream = fs.createWriteStream(path.join(dirPath, modelName));
      request(url).pipe(stream).on("close", function (err) {
    
          console.log(" file [" + modelName + "] The download ");
      });
    }
  })
})

2. Animation control

Mainly in the Cesium Animation and joint control of 3D model in application , The format of 3D model is gltf Format .

Animation control can be divided into two types ：

1. Model built-in animation ： The model itself includes animation , There is animation when modeling the model , Such as the rotation of helicopter propeller , Embodied in gltf In the file is animations attribute . in addition Cesium Provided the interface RunAnimation You can control whether to run the animation .

   

2. Manual control through model joints ： The model includes a series of joints , Such as rocket engine spitting fire 、 Primary and secondary separation, etc , Embodied in gltf In the file is articulations, coordination Cesium The interface can control the movement of specific joints of the model at different times ; About how to be in gltf Write in file articulations attribute , You can refer to
   [1]. https://agiweb.secure.force.com/faqs/articles/Keyword/What-Software-Setup-is-Required-to-Convert-Models-to-glTF
   [2]. https://github.com/AnalyticalGraphicsInc/gmdf/tree/master/samples
   [3]. https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Vendor/AGI_articulations/README.md