The StereoCamera is used to create a stereoscopic effect where objects in a scene appear to have depth and pop out of the screen. The update() method is used to update the internal matrices of the camera.
stereoCamera.update(camera)
camera - The camera to use for the stereo effect. This camera should be positioned at the viewer's eye level.The update() method updates the internal matrices of the StereoCamera based on the position and orientation of the camera parameter. This method should be called every time the camera moves or changes orientation.
The StereoCamera works by rendering two views of the scene, one for the left eye and one for the right eye. These views are offset from each other by a distance that mimics the distance between the human eyes. The update() method calculates the necessary offset and projection matrices for each view.
var camera = new THREE.PerspectiveCamera(90, window.innerWidth / window.innerHeight, 0.1, 1000);
var stereoCamera = new THREE.StereoCamera();
var renderer = new THREE.WebGLRenderer();
function animate() {
stereoCamera.update(camera);
renderer.render(scene, stereoCamera);
requestAnimationFrame(animate);
}
In this example, we create a PerspectiveCamera and a StereoCamera, and then call the update() method on the StereoCamera inside the animation loop. We then render the scene using the StereoCamera to create a stereoscopic effect.