How would you tween in a orbital motion

[bdziss (divine)]

What i want: tween camera from point a to b in an orbital motion

whats wrong: it just goes straight in a line from point a to b

[TheLazyRaven (Raven)]

Directly Tweening isn’t really suitable for orbitals. Just use runservice for this scenario

[bdziss (divine)]

Do you have an idea of how i could do that with runservice?

[neviquatro (nevi)]

Have you tried using Bezier curve?

[bdziss (divine)]

Nope, and I have no clue on how I would use it

[neviquatro (nevi)]

Bhristt's Bezier Curve Module (Tween support)

Introduction I’ve created a module that allows you to create an nth degree Bezier Curve given Vector3s and BaseParts (to add points that can change as the BaseParts position changes). This module can return the position of a point at any interval t, where 0 ≤ t ≤ 1, and is able to return the derivative of the Bezier Curve at any interval t, where 0 ≤ t ≤ 1. This is especially useful when you want to create something like an arrow following a path. The arrow has to point in the direction of th…

[neviquatro (nevi)]

If you want a full orbit around a part, then you’d use:

local part = workspace.Part -- change to the part you want to orbit around
local camera = game.Workspace.CurrentCamera
local distance = 10
local speed = 1

local function updateCam()
	local angle = tick() * speed
	local offset = Vector3.new(math.sin(angle), 0, math.cos(angle)) * distance
	camera.CFrame = CFrame.new(part.Position + offset, part.Position)
end
game:GetService("RunService").RenderStepped:Connect(updateCam)

[bhristt (chris)]

You can use a bit of vector manipulation to make a circle from 3 points A (point 1), B (point 2), and C (a center/focus of the bigger circle created by A and B). We can think of A and B as points lying on the circumference of a circle with center C in a plane P.

Now let’s think of this as a rotation problem:

We want to rotate the vector v_a about the axis N (the normal vector of the plane the circle is in) a total of θ radians. We’re doing this in a time t, which is defined in your provided TweenInfo.

local TweenService = game:GetService("TweenService")

local function orbitalTween(part: BasePart, tweenInfo: TweenInfo, a: Vector3, b: Vector3, c: Vector3): Tween

	local radius0 = (a - c).Magnitude
	local radius1 = (b - c).Magnitude
	
	local v_a = (a - c).Unit
	local v_b = (b - c).Unit
	local r = (b - a).Unit
	local n = r:Cross(v_a).Unit
	local s = v_a:Cross(n).Unit

	local proj_vA_vB = v_b:Dot(v_a)
	local proj_s_vB = v_b:Dot(s)

	local theta = math.atan2(-proj_s_vB, proj_vA_vB)

	local initialRotator = CFrame.fromMatrix(Vector3.zero, s, n, -v_a)
	local proxyNumVal = Instance.new("NumberValue")

	proxyNumVal.Changed:Connect(function(transform: number)
		local rotation = transform*theta
		local radius = radius0 + (radius1 - radius0)*transform
		local currentRotator = initialRotator*CFrame.fromEulerAnglesYXZ(0, rotation, 0)
		local position = c + radius*currentRotator.LookVector
		part.CFrame = CFrame.lookAt(position, c)
	end)

	local tweenObject = TweenService:Create(proxyNumVal, tweenInfo, {Value = 1})
	tweenObject.Completed:Once(function()
		proxyNumVal:Destroy()
	end)

	return tweenObject
end


task.wait(3)

local exampleOrbitalTween = orbitalTween(
	workspace.Test,
	TweenInfo.new(5),
	workspace.A.CFrame.Position,
	workspace.B.CFrame.Position,
	workspace.C.CFrame.Position
)

exampleOrbitalTween:Play()

This produces the following result:

Here’s the place file for the example I used:

OrbitalTest.rbxl (53.5 KB)

Note: You can only call TweenObject:Play() once. To play the tween again, you have to create it using the orbitalTween() function again.