How to start orbit from a set point, not at 0

NinjoOnline · May 3, 2022, 6:44am

I’m having issues, where once my part goes through a building, it goes to point 0, before starting it’s orbit, which just looks really off. Idea is, it should fly into building and then start to orbit around it, all smooth the whole time.
ezgif.com-gif-maker (57)
So it goes through the building, and instead of starting the orbit at the end, it goes back through the building and starts orbit there

local Rotation = 0
while true do
			Rotation += task.wait() * ROTATION_SPEED 
			
			
				part.RootPart.AlignPosition.RigidityEnabled = true
				part.RootPart.AlignOrientation.RigidityEnabled = true
				
				local OrbitCFrame = CFrame.new(
					math.sin(Rotation) * RADIUS,
					0,
					math.cos(Rotation) * RADIUS
				) + building:GetPivot().Position + Vector3.new(0, Size.Y / 2, 0)
				part.RootPart.AlignPosition.Position = OrbitCFrame.Position
				
				part.RootPart.AlignOrientation.CFrame = CFrame.lookAt(
					part.RootPart.Position,
					building:GetPivot().Position
				)
		end

SeargentAUS · May 3, 2022, 6:45am

Would you not be able to just change this:

local Rotation = 0

to something like

local Rotation = 87 --Wherever you want it to start

NinjoOnline · May 3, 2022, 6:46am

Sorry, I posted the question too early I edited with a bit more info + vid. Problem is, idk how to calculate the rotation value based on where to start

SeargentAUS · May 3, 2022, 6:47am

I think we may need a bit more of the code preceding the provided bit (so that we can see the code that initially changes it’s position

NinjoOnline · May 3, 2022, 6:50am

I use a bit of wacky stuff, but

local _, Size = building:GetBoundingBox()
		local Goal = part:GetPivot().Position + Vector3.new(0, Size.Y, 0) + (part:GetPivot().LookVector * 25)
		
		part.RootPart.AlignOrientation.CFrame *= CFrame.Angles(0, math.rad(180), 0)
		
		-- Continue through building and up
		local Tween = TweenService:Create(
			part.RootPart.AlignPosition,
			TweenInfo.new(0.25),
			{
				Position = Goal
			}
		)
		Tween:Play()
		Tween.Completed:Wait()
		
		local Rotation = 0
		
		-- Get starting position for orbit
		local OrbitCFrame = CFrame.new(
			math.sin(Rotation) * RADIUS,
			0,
			math.cos(Rotation) * RADIUS
		) + building:GetPivot().Position + Vector3.new(0, Size.Y / 2, 0)
		
		local BezierCurve = Bezier.new(
			part.RootPart.Position,
			part.RootPart.Position + (part:GetPivot().LookVector * 5),
			OrbitCFrame.Position
		)
		
		for i = 1, 4 do
			local Percent = (i * 25) / 100
			local NewCFrame = CFrame.new(BezierCurve:Get(Percent))
			
			local Tween = TweenService:Create(
				part.RootPart.AlignPosition,
				TweenInfo.new(0.25),
				{
					Position = NewCFrame.Position
				}
			)
			Tween:Play()
			Tween.Completed:Wait()
		end
		
		task.wait(0.1)

-- while loop

The bezier code just moves the position along a bezier curve. The first tween occurs after the part has gone through the building. It’s supposed to move up a tad, then the bezier part is supposed to tween it towards the starting orbit point,and then the orbit code in the while is what keeps it rotating.

SeargentAUS · May 3, 2022, 6:55am

If you remove the bezier curve bit, you may be able to use math.acos() or math.asin() to determine which rotation it should start at. Gimme a moment to figure out the math side of it

SeargentAUS · May 3, 2022, 7:10am

local function CalcRotation = (
    local CalcRotPos = Part.Position - building:GetPivot().Position --Change the part to the red cube 
    local X = CalcRotPos.X
    local Z = CalcRotPos.Z
    return math.atan(X/Z)
)

local Rotation = CalcRotation

NinjoOnline · May 3, 2022, 7:15am

Unsure if I did right, but looks really off, like it just jumps

ezgif.com-gif-maker (58)
And even if I do a wait, it still moves it to the 0 point, then orbits
ezgif.com-gif-maker (59)

SeargentAUS · May 3, 2022, 7:26am

What is the current script looking like?

NinjoOnline · May 3, 2022, 7:32am

I changed it from calculating the parts position to the goal, as since I’m using AlignPosition, there’s no way to get if it’s actually made its way to the goal, so figured I’d do from the goal position. But it resulted in the same thing I sent in the gif

Seems to work ok on some angles, as in it’ll print different rotation, and move to somewhat correct spot, but it’s not perfect

local function Orbit(building)
		local _, Size = building:GetBoundingBox()
		local Goal = part:GetPivot().Position + Vector3.new(0, Size.Y, 0) + (part:GetPivot().LookVector * 25)
		
		part.RootPart.AlignOrientation.CFrame *= CFrame.Angles(0, math.rad(180), 0)
		
		-- Continue through building and up
		local Tween = TweenService:Create(
			part.RootPart.AlignPosition,
			TweenInfo.new(0.25),
			{
				Position = Goal
			}
		)
		Tween:Play()
		Tween.Completed:Wait()
		
		local Rotation = CalcRotation(Goal, building)
		local OrbitCFrame = CFrame.new(
			math.sin(Rotation) * RADIUS,
			0,
			math.cos(Rotation) * RADIUS
		) + building:GetPivot().Position + Vector3.new(0, Size.Y / 2, 0)
		print(Rotation)
		local Tween = TweenService:Create(
			part.RootPart.AlignPosition,
			TweenInfo.new(0.25),
			{
				Position = OrbitCFrame.Position
			}
		)
		Tween:Play()
		Tween.Completed:Wait()
		
		task.wait(1)
		
		while true do			
			Rotation += task.wait() * ROTATION_SPEED 
			
				part.RootPart.AlignPosition.RigidityEnabled = true
				part.RootPart.AlignOrientation.RigidityEnabled = true
				
				local OrbitCFrame = CFrame.new(
					math.sin(Rotation) * RADIUS,
					0,
					math.cos(Rotation) * RADIUS
				) + building:GetPivot().Position + Vector3.new(0, Size.Y / 2, 0)
				part.RootPart.AlignPosition.Position = OrbitCFrame.Position
				
				part.RootPart.AlignOrientation.CFrame = CFrame.lookAt(
					part.RootPart.Position,
					building:GetPivot().Position
				)
		end
	end

SeargentAUS · May 3, 2022, 7:44am

The CalcRotation thing doesn’t actually take any parameters!
It could also just be moved to the main script:

local function Orbit(building)
		local _, Size = building:GetBoundingBox()
		local Goal = part:GetPivot().Position + Vector3.new(0, Size.Y, 0) + (part:GetPivot().LookVector * 25)
		
		part.RootPart.AlignOrientation.CFrame *= CFrame.Angles(0, math.rad(180), 0)
		
		-- Continue through building and up
		local Tween = TweenService:Create(
			part.RootPart.AlignPosition,
			TweenInfo.new(0.25),
			{
				Position = Goal
			}
		)
		Tween:Play()
		Tween.Completed:Wait()
		
		local CalcRotPos = part.RootPart.AlignPosition.Position - building:GetPivot().Position --Change the part to the red cube 
        local X = CalcRotPos.X
        local Z = CalcRotPos.Z
        local rotation = math.atan(X/Z)

		local OrbitCFrame = CFrame.new(
			math.sin(Rotation) * RADIUS,
			0,
			math.cos(Rotation) * RADIUS
		) + building:GetPivot().Position + Vector3.new(0, Size.Y / 2, 0)
		print(Rotation)
		local Tween = TweenService:Create(
			part.RootPart.AlignPosition,
			TweenInfo.new(0.25),
			{
				Position = OrbitCFrame.Position
			}
		)
		Tween:Play()
		Tween.Completed:Wait()
		
		task.wait(1)
		
		while true do			
			Rotation += task.wait() * ROTATION_SPEED 
			
				part.RootPart.AlignPosition.RigidityEnabled = true
				part.RootPart.AlignOrientation.RigidityEnabled = true
				
				local OrbitCFrame = CFrame.new(
					math.sin(Rotation) * RADIUS,
					0,
					math.cos(Rotation) * RADIUS
				) + building:GetPivot().Position + Vector3.new(0, Size.Y / 2, 0)
				part.RootPart.AlignPosition.Position = OrbitCFrame.Position
				
				part.RootPart.AlignOrientation.CFrame = CFrame.lookAt(
					part.RootPart.Position,
					building:GetPivot().Position
				)
		end
	end

NinjoOnline · May 3, 2022, 11:17am

Still same result of reverting back to 0 works on some, acts off on others

SeargentAUS · May 3, 2022, 11:26am

Might be to do with some negative things. Ill have a look in a bit

TortenSkjold · May 3, 2022, 11:48am

If all fails, you could make a dummyObject, that goes to the building way faster, and send the realObject to it’s CFrame after a set amount of time.