Trying to make a part adapt to terrain

[KiwiVR45 (d_d)]

im trying to make a building system for my game, i have the part moving already, however i cant figure out how to get the rotation working, i want it to adapt to the terrain (edit: it is actual terrain and not parts) and rotate,
here is the video: (nevermind i cant upload videos for some dang reason)
i cant find anything about this on devforum or youtube, please help
code:

local mouse = game.Players.LocalPlayer:GetMouse()
local part = Instance.new("Part")
part.Parent = workspace
part.Anchored = true
part.CanCollide = false
part.CanTouch = false
part.CanQuery = false
mouse.Move:Connect(function()
	part.Position = mouse.Hit.Position
end)

[Niletheus (Nil)]

You could use Raycasting & RaycastResult.Normal to position & orientate the part with respect to terrain

[KiwiVR45 (d_d)]

can you explain? im confused
idk about raycasts

[CloutBl0x (julian)]

Something like this would work.

Essentially what you’re doing is sending a Raycast out of the front and looking for collisions, if one happens, it rotates 10 degrees up, and goes again, and repeats until a clear path is found.

If you want it to turn back eventually you could also send one out the side.

[jaymeyzy (jaymey)]

i edited the script to make it take into account terrain angle

local mouse = game.Players.LocalPlayer:GetMouse()
local part = Instance.new("Part")
part.Parent = workspace
part.Anchored = true
part.CanCollide = false
part.CanTouch = false
part.CanQuery = false
local rayParams = RaycastParams.new()
rayParams.FilterDescendantsInstances = {part}
rayParams.FilterType = Enum.RaycastFilterType.Exclude
mouse.Move:Connect(function()
	local camPos = workspace.CurrentCamera.CFrame.Position
	local result = workspace:Raycast(camPos, (mouse.Hit.Position-camPos)*10, rayParams)
	if result then
		local normal = result.Normal
		local frame = CFrame.fromMatrix(mouse.Hit.Position, normal:Cross((mouse.Hit.Position-camPos).Unit), normal)
		part.CFrame = frame
	end
end)

you might want to edit the second/fourth parameter of the cframe.frommatrix depending on how you want the part oriented on the other axis

[Niletheus (Nil)]

I’m not the best at explaining things, so I’m just gonna link tutorials.

First though, a prerequisite for raycasting is knowing how to use CFrame, which allows you to position & orientate a part: https://youtu.be/8Ycrq3yp-ME?si=FnBurxPQu_sLOcNk

& here’s a good raycast tutorial that I found helpful personally: https://www.youtube.com/watch?v=YipkISTwGlc&t=535s

The reason raycasting helps in this situation is because with raycasting, you’re able to find out the direction which the surface of something is facing, whether that be a BasePart or Terrain.

It looks like @jaymeyzy has got you covered with a solution, but I’ll also just post mine because I already worked on it:

Video Demo: https://youtu.be/pY1Uanufyj0?si=joW1wJdMjVeVZS-i

Code: