sswu
const mesh = useRef<THREE.Mesh>(null); // mesh has type RefObject<THREE.Mesh | null>
...
useFrame((): void => {
if (mesh.current != null) {
mesh.current.rotation.x += 0.01;
}
});
...
return <mesh ref={mesh} ... />
As others have mentioned, the ref will typically attach by the time a `useEffect` hook is called, but for safety it's nice to have the null check.Cabin is nice because the total time I spend awake (< 30mins at each end) is less than that of taking a flight (at least a 3 hour contiguous block). It's also less stressful not having to worry about luggage, security, when to leave for the airport, etc.
If I couldn't sleep like a rock, or didn't live in Santa Monica, or wanted to go to south bay instead of SF, I would get a flight instead. I agree this is not for everyone, whether it be comfort-wise or location-wise, but I do hope this new tech helps people sleep more peacefully, and that they expand to more locations.
They sell the Pi Zero (W) at such a low price to promote the platform for educational and non-commercial purposes. However, the margins are so low at that price that they cannot afford to sell in bulk. They apparently do offer bulk buys (>500 [1]) at higher prices.
The few options to buy multiple are to buy kits (which basically pass that bulk pricing in the form of overpriced accessories), or at a higher price (e.g. I see $22 on Amazon), or be very patient and keep ordering.
[0] https://www.raspberrypi.org/forums/viewtopic.php?t=198705#p1... [1] https://www.raspberrypi.org/forums/viewtopic.php?t=201916#p1...
How can we design datetime libraries to prevent these issues? Or at least make it so that error-prone behaviors must be very explicit?