How would I make a model go down to the nearest part under it

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#1

So this is what I am trying to achieve.

A model with a primarypart should find a part under it that is closest to it and then just stick on to the part.

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image954Ă—614 23.8 KB

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Wheels of van clips baseplate/part when spawned
#2

make a ray going downwards. and then just do model:MoveTo(part.Position)

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#3

ray cast from the center of the model. when the ray hits a part, you can make the model go down by the length of your ray which you can calculate using magnitude. (StartPos-EndPos).Magnitude this will give you a distance in studs which you can move your part by.

#4 
local Workspace = workspace --Integrate into local environment.
local Model = Workspace.Model --Examples.
local ModelSize = Model:GetExtentsSize()

local _RaycastResult = Workspace:Raycast(Model.PrimaryPart.Position, Model.PrimaryPart.CFrame.UpVector * -100) --Raycast from primary part's position to 100 studs below.
if _RaycastResult then --Check if ray intercepted something.
	Model:PivotTo(_RaycastResult.Instance.CFrame * CFrame.new(0, _RaycastResult.Instance.Size.Y / 2, 0) * CFrame.new(0, ModelSize.Y / 2, 0)) --Move model to intercepted part's position while accounting for the part's size and the model's size.
end

Before:

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After:

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This can also be tweened (if necessary).

local Game = game --Local environment.
local Workspace = Game:GetService("Workspace")
local Tweens = Game:GetService("TweenService")

local Model = Workspace.Model --Examples.
local ModelSize = Model:GetExtentsSize()

task.wait(3)

local _RaycastResult = Workspace:Raycast(Model.PrimaryPart.Position, Model.PrimaryPart.CFrame.UpVector * -100) --Raycast from primary part's position to 100 studs below.
if _RaycastResult then --Check if ray intercepted something.
	local Tween = Tweens:Create(Model.PrimaryPart, TweenInfo.new(3), {CFrame = _RaycastResult.Instance.CFrame * CFrame.new(0, _RaycastResult.Instance.Size.Y / 2, 0) * CFrame.new(0, ModelSize.Y / 2, 0)})
	Tween:Play()
end

https://gyazo.com/5515265335ec2e6c8e69cef3bc7c3ae5

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#5

why did you use Game instead of game and Workspace instead of workspace?

Also I have an issue the other parts in the model get hit by the raycast…

#6

Hi!

Personally I find no reason for this. use “workspace” over game.workspace/game:GetService(“Workspace”), and don’t make a variable tha defines “game”.

#7

Then use a RaycastParams object so you can blacklist the model’s descendants.

https://developer.roblox.com/en-us/api-reference/datatype/RaycastParams

local Workspace = workspace

local _RaycastParams = RaycastParams.new()
_RaycastParams.FilterDescendantsInstances = {Model} --Table of instances to filter.
_RaycastParams.FilterType = Enum.RaycastFilterType.Blacklist

local _RaycastResult = Workspace:Raycast(Origin, Direction, _RaycastParams) --Origin and direction represent your ray's origin and its direction.

You can find more information regarding local environment integration here.