Update public/index.html

public/index.html

@@ -53,6 +53,46 @@ async function activateXR() {
   const camera = new THREE.PerspectiveCamera();
   camera.matrixAutoUpdate = false;
 
+  // Initialize a WebXR session using "immersive-ar".
+  const session = await navigator.xr.requestSession("immersive-ar");
+  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 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);
+
+      // Render the scene with THREE.WebGLRenderer.
+      renderer.render(scene, camera)
+    }
+  }
+  session.requestAnimationFrame(onXRFrame);
+
+
 }
 </script>
 </body>