after effectのアニメーションをjsonファイルとして書き出す。

node.js

var ae = require("after-effects");
var aeToJSON = require('ae-to-json/after-effects');
var jsonfile = require('jsonfile')
var fs = require('fs');

var outFileName = 'background_forest'
 
ae.execute(aeToJSON)
.then(function(json){
    fs.writeFile(`temp.json`, JSON.stringify(json), 'utf8', (err)=>{});
    
    var cameraJson = parseJson(json)
   
    var cameraJson = JSON.stringify(cameraJson);
    
    fs.writeFile(`${outFileName}.json`, cameraJson, 'utf8', (err)=>{
            
    });
})
.catch(function(e){
    throw e;
});

function getAnimation( transformObj ){
    let keyframes = transformObj.keyframes;
    
    let animationArr = [];
    for(let ii = 0; ii < keyframes.length; ii++){
        let keyframe = keyframes[ii];
        time = Number(keyframe[0].toFixed(3));
        value = keyframe[1].map((num)=>{return Number(num.toFixed(1));});
        animationArr.push([time,value]);
    }
    
    return animationArr;
}

function parseJson(json){
    var project = json.project;
    var layers, camera;// = project.items[project.items.length - 1].layers;
    
    for(var ii = 0; ii < project.items.length; ii++){
        
        if(project.items[ii]['name'] == outFileName){
            layers = project.items[ii].layers;
            console.log(layers);
        }
    }
    
    for(var ii = 0; ii < layers.length; ii++){
        console.log(layers[ii].name);
        if(layers[ii].name == '3D Tracker Camera'){
            camera = layers[ii];
        }
    }
    
    var cameraProperties = camera['properties'];
    
    let options = cameraProperties['Camera Options'];
    console.log(options);
    let transform = cameraProperties['Transform'];
    
    let positionArr = getAnimation(transform['Position']);
    let orientationArr = getAnimation(transform['Orientation']);
    
    var cameraObj = {
        animations: {
            position: positionArr,
            // orientation: orientationArr
        },
        zoom: {
            'unit': options['Zoom']['unitsText'],
            'value': Number(options['Zoom']['value'].toFixed(2))
        },
        aperture: {
            'unit': options['Aperture']['unitsText'],
            'value': Number(options['Aperture']['value'].toFixed(2))
        },
        focusDistance: {
            'unit': options['Focus Distance']['unitsText'],
            'value': Number(options['Focus Distance']['value'].toFixed(2))
        }
        
    }
    
    return cameraObj;
}