I need help with wedge part

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#1

I’m trying make building system, but I’m stuck on Wedge part’s slope for an entire day, and broke my brain…
Can someone help me, and say, what I’m making wrong with it?

triangle

local Wedge = mouse.target
local WedgeSize = Wedge.Size
local WedgeCFrame = Wedge.CFrame
local Position = mouse.Hit.Position 
local NullPos = (WedgeCFrame:Inverse() * CFrame.new(Position)).Position

local AC = WedgeSize.Y 
local CB = WedgeSize.Z
local AB = (AC^2 + CB^2) ^0.5
local CD = AC * CB / AB --lenght of height
local AD = AC ^ 2 / AB --lenght of projection

local SlopePosition = Vector3.new(0, AC / 2, -CB / 2):Lerp(Vector3.new(0, -AC / 2, CB / 2), Vector3.new(0, AC / 2, -CB / 2) - Vector3.new(0, NullPos.Y, -NullPos.Z)).Magnitude / AB) - AD / AB) + Vector3.new(NullPos.X, 0, 0)
				
local Angle = CFrame.new(Vector3.new(0, -AC / 2, CB / 2), (CFrame.new(Vector3.new(0, AC / 2, CB / 2), Vector3.new(0, -AC / 2, -CB / 2)) + CFrame.new(Vector3.new(0, AC / 2, CB / 2), Vector3.new(0, -AC / 2, -CB / 2)).LookVector *  AD).Position)
				
Offset = (Angle + (Angle.LookVector * (CD + Part.Size.Z / 2))) + Vector3.new(SlopePosition.X, SlopePosition.Y, SlopePosition.Z)

Part.CFrame = TargetCFrame * Offset

What I want achieve:
image

But for now, part’s orientation is correct only, position is wrong.

image

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#2

I’m terrible with math, and shouldn’t be giving any ideas, however I feel like a raycast might work? Cast from the bottom of the green part to the wedge part then set the CFrame of the green part to the end of the ray + part.Size/2? Only reason this seems reluctant would be it seems kind of like it could be a quite rare situation to be needed and looks like it might be a pain to implement but sounds easier than generally doing the math for it.

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#3

Like @anthlons said, you can use Raycast.

Here’s an example:


local Part = -- your part.

local params = RaycastParams.new()
params.FilterType = Enum.RaycastFilterType.Blacklist
params.FilterDescendantsInstances = {part}

local ray_result = workspace:Raycast(Part.Position, Vector3.new(0,-15,0), params)
if ray_result then
    Part.CFrame = CFrame.fromMatrix(ray_result.Position)
end

To rotate a part you can use RaycastResult.Normal which returns the normal where the RaycastResult occurred.

if ray_result then
    local look_vec, right_vec, up_vec

    up_vec = ray_result.Normal
    look_vec = up_vec:Cross(Part.CFrame.rightVector)
    right_vec = up_vec:Cross(look_vec)

    Part.CFrame = CFrame.fromMatrix(ray_result.Position, right_vec, up_vec, look_vec)
end

Keep in mind that this is just an example and I haven’t tested it, you just need to play around with it.

Here’s API for this WorldRoot:Raycast

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#4

FINALLY! While I was walking to shop to buy onions, I came up with great idea that worked WITHOUT RAYCASTING! Here’s solution:

local NullPos = (TargetCFrame:Inverse() * CFrame.new(Position)).Position
				
local AC = TargetSize.Y
local CB = TargetSize.Z
local AB = (AC^2 + CB^2) ^0.5
local CD = AC * CB / AB
local AD = AC ^ 2 / AB
				
local SlopePosition = Vector3.new(0, -AB, 0):Lerp(Vector3.new(0, 0, 0), ((Vector3.new(0, AC / 2, -CB / 2) - Vector3.new(0, NullPos.Y, -NullPos.Z)).Magnitude / AB) - AD / AB + 1) - Vector3.new(NullPos.X, 0, 0)
								
local Angle = CFrame.new(Vector3.new(0, -AC / 2, CB / 2), (CFrame.new(Vector3.new(0, AC / 2, CB / 2), Vector3.new(0, -AC / 2, -CB / 2)) + CFrame.new(Vector3.new(0, AC / 2, CB / 2), Vector3.new(0, -AC / 2, -CB / 2)).LookVector *  AD).Position)
				
Offset = (Angle + (Angle.LookVector * (CD + Part.Size.Z / 2))) * CFrame.new(-SlopePosition)

RedDot.CFrame = Angle

Part.CFrame = TargetCFrame * Offset
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#5

Must’ve been the crave for onions that figured it out. Great that you figured it out yourself! :slight_smile:

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