How do I make a ray cast from a part to the part my mouse is on?

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1

How would I go about making this ray cast from a part (script.Parent.Shoot) to the part my mouse is on?

local function semiResult(x, y)
	    local unitRay = camera:ScreenPointToRay(mouse.x, mouse.y)
	    return workspace:Raycast(unitRay.Origin, unitRay.Direction * 500, semiParams)
	end
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2

Get the part of the raycast and use the
cframe.new(Position, Lookat)
constructor to get a cframe that comes from the part you want to raycast from to the part your mouse is at.
Example:

local Part = semiResult(MousePos)
if Part then
    Part = Part.Instance
    local NewCF = CFrame.new(Shoot.Position, Part.Position)
    local RaycastResult = workspace:Raycast(Shoot.Position, NewCF.LookVector * Range)
    --do whatever you wanted to do with the raycast
end
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