How do I make a raycast and fire it?

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#1

I’m trying to detect if my player touched the ground or not, so I’m going to fire a raycast to check.

I’m not sure how to do this though…

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#2

It is kind of unclear what you exactly want, but assuming you have knowledge of raycasts.
Cast a raycast from the root part of the player, and check if there is a result. (Add params to prevent hitting yourself)

local RaycastResult = Workplace:Raycast(HumanoidRootPart.Position, HumanoidRootPart.Position - Vector3.new(0,-3,0)) --Made this on a whim, you may need to change the Y value there.

(Alot easier way of doing this is humanoid.floormaterial, if there isn’t a floor material then they are in air)

#3

If your game is R15 then you could ray cast from the character’s feet to see how close they are to the ground

#4

There are plenty of posts about this topic, as well as the Roblox documentation:
<Raycasting | Roblox Creator Documentation
<Intro to Raycasting