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

<!-- Starting an immersive WebXR session requires user interaction.
    We start this one with a simple button. -->
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<button onclick="activateXR()">Start Hit to Place Demo</button>
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<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});
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  const scene = new THREE.Scene();
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  const directionalLight = new THREE.DirectionalLight(0xffffff, 1.0);
  directionalLight.position.set(10, 15, 10);
  scene.add(directionalLight);
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  // 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;

  // The API directly updates the camera matrices.
  // Disable matrix auto updates so three.js doesn't attempt
  // to handle the matrices independently.
  const camera = new THREE.PerspectiveCamera();
  camera.matrixAutoUpdate = false;

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

  // A 'local' reference space has a native origin that is located
  // near the viewer's position at the time the session was created.
  const referenceSpace = await session.requestReferenceSpace('local');

  // Create another XRReferenceSpace that has the viewer as the origin.
  const viewerSpace = await session.requestReferenceSpace('viewer');
  // Perform hit testing using the viewer as origin.
  const hitTestSource = await session.requestHitTestSource({ space: viewerSpace });

  const loader = new THREE.GLTFLoader();
  let reticle;
  loader.load("https://immersive-web.github.io/webxr-samples/media/gltf/reticle/reticle.gltf", function(gltf) {
    reticle = gltf.scene;
    reticle.visible = false;
    scene.add(reticle);
  });

  let beeModel;
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  loader.load("https://transfer.hft-stuttgart.de/gitlab/22raya1mpg/argumented-reality/-/blob/master/bee/scene.gltf", function(gltf) {
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    beeModel = gltf.scene;
  });

  session.addEventListener("select", (event) => {
    if (beeModel && reticle) {
      const clone = beeModel.clone();
      clone.position.copy(reticle.position);
      scene.add(clone);
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    }
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  });

  // Create a render loop that allows us to draw on the AR view.
  const onXRFrame = (time, frame) => {
    // Queue up the next draw request.
    session.requestAnimationFrame(onXRFrame);

    // Bind the graphics framebuffer to the baseLayer's framebuffer
    gl.bindFramebuffer(gl.FRAMEBUFFER, session.renderState.baseLayer.framebuffer);

    // Retrieve the pose of the device.
    // XRFrame.getViewerPose can return null while the session attempts to establish tracking.
    const pose = frame.getViewerPose(referenceSpace);
    if (pose) {
      // In mobile AR, we only have one view.
      const view = pose.views[0];

      const viewport = session.renderState.baseLayer.getViewport(view);
      renderer.setSize(viewport.width, viewport.height);

      // Use the view's transform matrix and projection matrix to configure the THREE.camera.
      camera.matrix.fromArray(view.transform.matrix);
      camera.projectionMatrix.fromArray(view.projectionMatrix);
      camera.updateMatrixWorld(true);

      const hitTestResults = frame.getHitTestResults(hitTestSource);
      if (hitTestResults.length > 0 && reticle) {
        const hitPose = hitTestResults[0].getPose(referenceSpace);
        reticle.visible = true;
        reticle.position.set(hitPose.transform.position.x, hitPose.transform.position.y, hitPose.transform.position.z);
        reticle.updateMatrixWorld(true);
      }

      // Render the scene with THREE.WebGLRenderer.
      renderer.render(scene, camera);
    }
  };
  session.requestAnimationFrame(onXRFrame);
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}
</script>
</body>
</html>

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