More specifically, I wanna know how they made the beam perfectly fit the trajectory of the projectile, or how they made the projectile perfectly fit the beam.
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Well, if you’re raycasting to find the position of where the object lands, you could just use that exact same function to create the beam.
In this case this just looks like a parabolic curve function. Just make a curve function and use the same inputs for the raycast for the beam.
If they’re using :ApplyImpulse then it’s a bit more difficult because that would require calculating the gravity and the force required to move the object; which is why I would just go with the first option of following a pre-calculated route.
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Same way they calculated how to throw the object, just doing the same math on the client for displaying a Billboard in many different parts I guess haha.