If your PC, or more likely, your next PC has Intel's RealSense 3D camera along with Windows 10, then you can simply place your face in front of your PC to log in to Windows.
Intel's RealSense 3D camera is actually three cameras in one. It features a 1080p HD camera, an infrared camera and an infrared laser projector, which together can measure depth and track the location and position of objects in space. Intel has a meager collection of games and apps that work with the RealSense 3D camera, but the best application to use with the camera thus far is Windows 10's biometric authentication feature called Windows Hello.
With Windows Hello, you can use a fingerprint scanner or the RealSense 3D camera to log into Windows via your finger or face, respectively.
I am using the RealSense 3D camera-equipped Lenovo IdeaCentre AIO 700 PC to show you how to set up Windows Hello so that you can log in using your face instead of needing to type in a password.
1. Go to Settings > Accounts > Sign-in options
2. Set up an account password and PIN
3. Click the "Set up" button for Face under Windows Hello
4. Click the "Get started" button, enter your PIN, and sit in front of the camera while Windows takes a few seconds to scan your face.
5. Click "Close" and you're all set.
(You can return to this page in Settings and click "Improve recognition" so that Windows Hello can better recognize your mug, whether you're now wearing glasses, grown a beard or find yourself in different lighting conditions than when you first enrolled.)
After setting up Windows Hello, the next time you encounter the Windows 10 lock screen, instead of asking for your password, it will look for your face. At the top of the lock screen, a "Looking for you..." message is displayed until the Intel RealSense 3D camera recognizes your face and logs you in.
I found that Windows Hello was quick to recognize my mug, and it didn't force me to lean in; I was able to simply sit down in front of the PC as I normally would to be logged in.
For more, get the latest news and tips about Windows 10.