How to make a part aim at another part?

Help and Feedback Scripting Support
1

I’ve decided to revisit an old project of mine from a few months prior, I’ve completely scraped the old, buggy mechanics and am currently working on new mechanics.

My problem is that when two balls touch, they do not fire ‘Radiation’ particles at each other.

Bonds are formed when two spheres touch. Prior to making bonds the spheres would send these ‘Raditaion’ particles in every direction. If a particle from a different cell is detected, the sphere would follow the particle’s path.

Once bonds are made, to secure the bond the spheres would fire particles at each other to not lose contact. In an update bonds would be broken if contact breaks.

Here’s the code that is run when making each particle:

if bond then
		rad.CFrame = CFrame.lookAt(rad.Position,bond.Position)
	else
		rad.Orientation = Vector3.new(ran(0,255),ran(0,255),ran(0,255))
	end

(bond refers to the bonded BasePart, rad refers to the Radiation BasePart)
I’ve tried CFrame.lookAt and bond.Position-rad.Position, techniques that I’ve found on the forum and external sources. It’s either my incorrect usage or context.

TL;DR How to make particles aim at a BasePart

2

Simple CFrame.LookAt

Part.CFrame = CFrame.LookAt(Part.Position, Part2.Position)

The Front of the Part looka at Part2’s position
Edit: didnt read post correctly

3

Bumping as I’ve not solved the issue yet.

Here’s the full script:

local cell = script.Parent
local ran = math.random
local PhyServ = game:GetService('PhysicsService')

local bond : BasePart = nil


PhyServ:RegisterCollisionGroup('Cells')
PhyServ:RegisterCollisionGroup('Rads')

PhyServ:CollisionGroupSetCollidable('Cells','Cells',true)
PhyServ:CollisionGroupSetCollidable('Cells','Rads', false)
PhyServ:CollisionGroupSetCollidable('Rads','Rads',false)

cell.CollisionGroup = 'Cells'
local function des(p)
	task.wait(5)
	p:Destroy()
end

local function radmeet(rad:BasePart)
	if rad.Parent ~= cell and rad.Name == 'rad' then
		cell.Orientation = rad.Orientation*Vector3.new(-1,-1,1)
	elseif rad.Name == 'Cell' then
		bond = rad
	end
end
cell.Touched:Connect(radmeet)

while true do
	task.wait(.05)
	local rad = Instance.new("Part")
	rad.Parent = cell
	rad.Transparency = .5
	rad.Color = Color3.new(200,0,0)
	rad.Size = Vector3.new(.2,.2,.2)
	rad.Position = cell.Position
	rad.Shape = Enum.PartType.Block
	if bond then
		rad.CFrame = CFrame.lookAt(rad.Position,bond.Position)
	else
		rad.Orientation = Vector3.new(ran(0,255),ran(0,255),ran(0,255))
	end
	local linvel = Instance.new('LinearVelocity')
	linvel.Parent = rad
	linvel.RelativeTo = Enum.ActuatorRelativeTo.Attachment0
	linvel.VelocityConstraintMode = Enum.VelocityConstraintMode.Vector
	linvel.VectorVelocity = Vector3.new(3,0,0)
	local atc = Instance.new('Attachment')
	atc.Parent = rad
	linvel.Attachment0 = atc
	rad.Name = 'rad'
	linvel.MaxForce = 99999999
	rad.CanCollide = false
	task.spawn(des,rad)
	rad.CollisionGroup = 'Rads'
	end
4

I think you need to check the ‘locked to part’ box on the particle emitters.

5

I don’t know what you’re referring to. None of the things I’ve used in the script have that property.

6

Try changing the axis to the Z axis which is the axis CFrame.lookAt uses

linvel.VectorVelocity = Vector3.new(0,0,-3)
1 Like
7

Thanks! It worked!

I’ve tried changing the axis but I was changing it on the wrong variable.

Here’s my final product. I’ve added functionality for cell bonds to be divorced, and when cells are bonded their radiation particles lifetime is shorter and the cells are more responsive to these particles.

local cell = script.Parent
local ran = math.random
local PhyServ = game:GetService('PhysicsService')

local bond : BasePart|false = false
local tbond : number = 0


PhyServ:RegisterCollisionGroup('Cells')
PhyServ:RegisterCollisionGroup('Rads')

PhyServ:CollisionGroupSetCollidable('Cells','Cells',true)
PhyServ:CollisionGroupSetCollidable('Cells','Rads', false)
PhyServ:CollisionGroupSetCollidable('Rads','Rads',false)

cell.CollisionGroup = 'Cells'
local function des(p)
	task.wait(1)
	if not bond then task.wait(3) end
	p:Destroy()
end


local function celldivorce(b)
	task.spawn(function()
		if b == bond then
			local savedtbond = tbond
			task.wait(2)
			if tbond == savedtbond and b == bond then
				bond = false
			end
		end
	end)
end
local function radmeet(rad:BasePart)
	if rad.Parent ~= cell and rad.Name == 'rad' then
		cell.Orientation = rad.Orientation*Vector3.new(-1,-1,-1)
		
		if bond ~= false then
			cell.LinearVelocity.VectorVelocity = Vector3.new(0,0,-3)
		else
			cell.LinearVelocity.VectorVelocity = Vector3.new(0,0,-.5)
		end

	elseif rad.Name == 'Cell' then
		bond = rad
		tbond+=1
	end
end
cell.Touched:Connect(radmeet)
cell.TouchEnded:Connect(celldivorce)

while true do
	task.wait(.05)
	if bond then task.wait(.1) end
	local rad = Instance.new("Part")
	rad.Parent = cell
	rad.Transparency = .5
	rad.Color = Color3.new(200,0,0)
	rad.Size = Vector3.new(.2,.2,.2)
	rad.Position = cell.Position
	rad.Shape = Enum.PartType.Block
	if bond then
		rad.CFrame = CFrame.lookAt(rad.Position,bond.Position)
	else
		rad.Orientation = Vector3.new(ran(0,255),ran(0,255),ran(0,255))
	end
	local linvel = Instance.new('LinearVelocity')
	linvel.Parent = rad
	linvel.RelativeTo = Enum.ActuatorRelativeTo.Attachment0
	linvel.VelocityConstraintMode = Enum.VelocityConstraintMode.Vector
	linvel.VectorVelocity = Vector3.new(0,0,-3)
	local atc = Instance.new('Attachment')
	atc.Parent = rad
	linvel.Attachment0 = atc
	rad.Name = 'rad'
	linvel.MaxForce = 99999999
	rad.CanCollide = false
	task.spawn(des,rad)
	rad.CollisionGroup = 'Rads'
	if not table.find(cell:GetTouchingParts(),bond) then
		bond = false
	end
	end
8

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.