Unity/3d/視点操作

サンプル

右クリックからのドラッグで、視点操作

呼び出し(UniRxだと)

 Observable.EveryUpdate()
            .Where(_ => Input.GetMouseButton(0))
            .Subscribe(_ => {
                RotateCamera();
            })
            .AddTo(gameObject);

rotateSpeed = 2f;
private void RotateCamera()
{
    Vector3 angle = new Vector3(Input.GetAxis("Mouse X") * rotateSpeed,Input.GetAxis("Mouse Y") * rotateSpeed, 0);
    mainCamera.transform.RotateAround(player.transform.position, Vector3.up, angle.x);
    mainCamera.transform.RotateAround(player.transform.position, transform.right, angle.y);
}

参考：https://xr-hub.com/archives/6272