Set part size from point A to point B

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#1

What I want to do is like a taser script, I’ve got the click event and stuff but I want a part to form from “FirePart” (defined as local fp) to the position of the mouse (defined as mousepos) which is a Vector3.

Example:
The mouse is aiming at this location so it has rotated and positioned itself to the location of the part

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It sizes itself so its at the location that the mouse was
image

Cheers.
Note: Briefly read up on some Lerp function, not sure if this would be useful.

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#2

You will need to use Lerp for this, Lerp basically finds the point between 2 vector3s, Example Script, which forms a line from PointA to a Player.

    local Part = Instance.new("Part")--Create Part
	Part.Parent = workspace
	Part.Anchored = true
	Part.Size = Vector3.new(15,1,plrdistance)--Distance From Point A to B

    Part.CanCollide = false
	local BaseV3 = player.Character.HumanoidRootPart.Position
    local Point2Position = Vector3.new()
	
	Part.Position = Model.PrimaryPart.Position:Lerp(BaseV3, 0.5)--Moves the part exactly half way between Point A and B
	Part.CFrame = CFrame.new(Part.Position,Point2Position)--Makes Part Look At Point

This isn’t exactly what you asked for but I hope it helps get you started,

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#3

What is ‘plrdistance’ defined as? Sorry if I’m being dumb.

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#4 
PlayerService.PlayerA:DistanceFromCharacter(Point2Vector3)
#5

This isn’t particularly aiding me here, it won’t always touch a player, could be the floor. I don’t have checks for that.

#6 
local fp = --FirePart
local mousepos = --Position of mouse
local plrdistance = (fp.Position - mousepos).Magnitude

Pretty sure it’s this,
Here is how it would be with variables:
(this is @Wizard101fire90 's code, if it works mark their reply as the solution)

local fp = --FirePart
local mousepos = --Position of mouse
local plrdistance = (fp.Position - mousepos).Magnitude

local Part = Instance.new("Part")--Create Part
Part.Parent = workspace
Part.Anchored = true
Part.Size = Vector3.new(15,1,plrdistance)--Distance From Point A to B

Part.CanCollide = false
	
Part.Position = fp.Position:Lerp(mousepos, 0.5)--Moves the part exactly half way between Point A and B
Part.CFrame = CFrame.new(Part.Position,mousepos)--Makes Part Look At Point
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