Sliding to alter the vertex coordinates

Seeking help to dynamically change the x and y position of the first vertex in a triangle using sliders on datgui. Below is my code, can someone help me figure out what I'm doing wrong by assigning variables inside animate()? I've been struggling with this issue.

Here is the complete code: http://jsfiddle.net/2WKqL/165/

I suspect the problem lies here.

function animate() {

requestAnimationFrame( animate );


params.xposv1=mesh.geometry.vertices[0].x; 
params.yposv1=mesh.geometry.vertices[0].y; 

mesh.geometry.verticesNeedUpdate = true;

    renderer.render( scene, camera );

}
javascriptthree.js

Answer №1

Utilize the global variable geometry and access its property vertices at index 0 within your graphical user interface.

Here's how you can achieve this:

var camera, scene, renderer;
var geometry, material, mesh;

init();
animate();

function addDatGui() {
  var gui = new dat.GUI();

  gui.add(geometry.vertices[0], 'x').min(-800).max(800).step(5);
  gui.add(geometry.vertices[0], 'y').min(-800).max(800).step(5);

}

function init() {

  camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 1, 10000);
  camera.position.z = 1000;

  scene = new THREE.Scene();

  geometry = new THREE.Geometry();
  geometry.vertices = [
    new THREE.Vector3(-94, -200, 0),
    new THREE.Vector3(92, 68, 0),
    new THREE.Vector3(-105, 180, 0)
  ];
  geometry.faces = [new THREE.Face3(0, 1, 2)];
  mesh = new THREE.Mesh(geometry, new THREE.MeshBasicMaterial({
    color: 0xffff00,
    side: THREE.DoubleSide
  }));
  scene.add(mesh);

  renderer = new THREE.WebGLRenderer();
  renderer.setSize(window.innerWidth, window.innerHeight);

  document.body.appendChild(renderer.domElement);
  renderer.render(scene, camera);
  addDatGui();

}

function animate() {

  requestAnimationFrame(animate);
  mesh.rotation.y += 0.01;

  mesh.geometry.verticesNeedUpdate = true;

  renderer.render(scene, camera);

}
body {
  overflow: hidden;
  margin: 0;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/97/three.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.7.3/dat.gui.min.js"></script>

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