Threejs - BufferAttribute - Vector3s

by black strings

HTML

<script src="https://rawgit.com/mrdoob/three.js/dev/build/three.js"></script>
<script src="https://rawgit.com/mrdoob/three.js/dev/examples/js/controls/OrbitControls.js"></script>

CSS

/* fix mouse click offset errors when doing drags */
body {
  margin: 0;
}

JavaScript

class Main {
	constructor(){
    this.objects = []; 
    this.scene = new THREE.Scene();
    
    var width = window.innerWidth;
    var height = window.innerHeight * .75;
    this.camera = new THREE.PerspectiveCamera( 
    	35, width/height, 0.1, 1000 
    );
    
    this.renderer = new THREE.WebGLRenderer();
    
    
    this.renderer.setSize( width, height );
    this.renderer.setClearColor( 0xcccccc, 1 ); 
    
    // controls should set 2nd param or mouse move will be all over the main dom element
    // null on 2nd param, threejs will use the parent as the mouse click and prevent default
    this.controls = new THREE.OrbitControls(this.camera, this.renderer.domElement);
    
    // will turn off zooming while panning with right mouse click, false by default
    this.controls.screenSpacePanning = true;
    
    document.body.appendChild( this.renderer.domElement );
    this.scene.add(this.camera);

    
    this.setToFullOrbit(this.controls);
    this.camera.position.copy(new THREE.Vector3(10,10,10));
    // fix first frame render issue going invisible
    this.camera.lookAt(new THREE.Vector3(0,0,0));

    var axisHelper = new THREE.AxisHelper();
    this.scene.add(axisHelper);

		this.createScene();

  }
  
  createScene(){
  
  	 // from vector3s to buffer attributes
    const itemSize = 3; // how many stored values are in a vector3
    const vec3s = [
      new THREE.Vector3(1,0,0),
      new THREE.Vector3(0,2,0)
    ];
    const arrayBuffer = new Float32Array(vec3s.length * itemSize);
    const attr = new THREE.BufferAttribute(arrayBuffer, itemSize);
    // update the buffer attribute with the new values from the vec3s
    attr.copyVector3sArray(vec3s);

		// here you can transform a group of vectors
    // apply a translate shift matrix
    const tm = new THREE.Matrix4().makeTranslation(1,0,0);
    tm.applyToBufferAttribute(attr);
    console.log(attr);

    // from buffer attributes to vector3s
    var newVec3s = [];
    for(var i=0; i<attr.count;...