NDC to XYZ Coordinates (ThreeJS)

cursorUtil.ts

/*
Translates normalised device coordinates (NCD) to world coordinates.

Calculate NCD using mouseMove/pointerMove event listeners:
    mouseX = (e.clientX / window.innerWidth) * 2 - 1;
    mouseY = -(e.clientY / window.innerHeight) * 2 + 1;

You can then test if it works by setting up a camera and a cursor mesh object in the scene,
copying its position from the return value every animation frame:
    cursorMesh.position.copy(getCursorWorldCoordinates());

If moving the camera around (e.g. from player movement) be sure to run this beforehand.
*/

const _cursorVectorFromCamera = new THREE.Vector3();
const _cursorVectorFromOrigin = new THREE.Vector3();
function getCursorWorldCoordinates(): THREE.Vector3 {
    _cursorVectorFromCamera.x = inputController.mouseX;
    _cursorVectorFromCamera.y = inputController.mouseY;
    _cursorVectorFromCamera.z = 0;
    _cursorVectorFromCamera.unproject(camera);
    _cursorVectorFromCamera.sub(camera.position).normalize();

    _cursorVectorFromCamera.multiplyScalar(-camera.position.y / _cursorVectorFromCamera.y);

    return _cursorVectorFromOrigin.copy(camera.position).add(_cursorVectorFromCamera);
}