FirtsTrial.html

<!doctype html>
<html>
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <title>Tap to Place Demo</title>

  <!-- three.js -->
  <script src="https://unpkg.com/three@0.126.0/build/three.js"></script>
  <script src="https://unpkg.com/three@0.126.0/examples/js/loaders/GLTFLoader.js"></script>
</head>
<body>

<!-- Starting an immersive WebXR session requires user interaction.
    We start this one with a simple button. -->
<button onclick="activateXR()">Start Tap to Place Demo</button>
<script>
async function activateXR() {
  // Add a canvas element and initialize a WebGL context that is compatible with WebXR.
  const canvas = document.createElement("canvas");
  document.body.appendChild(canvas);
  const gl = canvas.getContext("webgl", {xrCompatible: true});

  // Set up the WebGLRenderer, which handles rendering to the session's base layer.
  const renderer = new THREE.WebGLRenderer({
    alpha: true,
    preserveDrawingBuffer: true,
    canvas: canvas,
    context: gl
  });
  renderer.autoClear = false;

  // To be continued in upcoming steps.

  const loader = new THREE.GLTFLoader();
  let model;
  loader.load("https://transfer.hft-stuttgart.de/pages/bramirez/civ/index.html", function(gltf) {
    model = gltf.scene;
  });

  const session = await navigator.xr.requestSession("immersive-ar", { requiredFeatures: ['hit-test'] });
  session.updateRenderState({
    baseLayer: new XRWebGLLayer(session, gl)
  });

  const referenceSpace = await session.requestReferenceSpace('local');
  const viewerSpace = await session.requestReferenceSpace('viewer');
  const hitTestSource = await session.requestHitTestSource({ space: viewerSpace });

  const reticle = new THREE.Mesh(
    new THREE.RingGeometry(0.1, 0.12, 32),
    new THREE.MeshBasicMaterial({ color: 0x00ff00 })
  );
  reticle.visible = false;
  scene.add(reticle);

  const onXRFrame = (time, frame) => {
    session.requestAnimationFrame(onXRFrame);

    gl.bindFramebuffer(gl.FRAMEBUFFER, session.renderState.baseLayer.framebuffer)