Moving a part relative to sphere

Help and Feedback Scripting Support
#3

Tried that, won’t work. >> chars

#4

What sort of issue did you have with it?

#5

Spawning the unit in; ends up weird.

#6

Did you use C0 / C1? (I can’t remember the exact property for it so I might have mentioned the wrong one)

#7

C0 sphere, C1 cube >> chars chars

#8

I haven’t tested it myself, but tell me if this works:
How to rotate a part around a point while retaining the orientation of the part? - Help and Feedback / Scripting Support - DevForum | Roblox

#9

not the right result. i have a script, if i can send that to you?

edit: that post shows how to keep it looking at a part while moving straight.
what im looking for is how to slerp a part.

#10

I think I might be thinking about something different to you, is there any chance you could send an image of a diagram, or something similar?

#11

Here is a post that describes the same thing

#12

I compiled the last project and created something very close to what I’m aiming for. It looks like this:

local sin, cos, acos = math.sin, math.cos, math.acos
local function slerp(p0, p1, t)
	--From https://en.wikipedia.org/wiki/Slerp
	-- See "Geometric Slerp"
	local l = p0.Magnitude
	p0 = p0.Unit
	p1 = p1.Unit
	local Omega = acos(p0:Dot(p1))
	return (
		p0 * sin( (1 - t) * Omega) / sin(Omega) +
			p1 * sin( (t    ) * Omega) / sin(Omega)
	) * l
end

local steps = 10
local last_p = origin.Position
for i = 1/steps, 1, 1/steps do
	local c = game.ReplicatedStorage.Highlighter:Clone()
	local p = slerp(origin.Position, endPoint, i)
	local d = (p - last_p).Magnitude
	c.Size = Vector3.new(1, 1, d)
	c.CFrame = CFrame.new(p, last_p) * CFrame.new(0, 0, -d * 0.5)
	c.Parent = workspace.CirclePath
	last_p = p
end
#13

The only issue is that the sphere size is predetermined. How can I solve this?

#14

Slerp.rbxl (89.2 KB)
Game available for editing

#15

I’ll write a script for you with ready destination variable (used a non-existing getDestination() function as an alternative), I also assume that the Sphere and Part are in workspace.

local sphere = workspace.Sphere
local part = workspace.Part

local currentPosition = part.Position
local destination = getDestination()

local sub = destination-currentPosition
local sphereRay = sphere.Size.X/2 -- make sure that your sphere has the same X, Y and Z size values

local totalFramesCount = 100

for i=1, totalFramesCount do
    local newCFrame = CFrame.lookAt((((i/totalFramesCount*sub+currentPosition)-sphere.Position).Unit*sphereRay)+spherePosition, sphere.Position)
    part.CFrame = newCFrame * sphere.CFrame
    task.wait(0.015) -- cooldown between frames
end

Tell me if something errors or it’s not working and I’ll correct myself because I wrote this on phone. It’s also not a perfect solution because the move speed will be lower at the start and the end of the path. [Not anymore] The part will also not rotate.

First edit: corrected the newPosition variable, used val.Magnitude.Unit on accident and corrected it to val.Unit.

Second edit: Used CFrame.lookAt() constructor to make the part rotate.

Third edit: The script has been updated to assign a CFrame instead of a Position. Additionally, the CFrame is now multiplied by the sphere’s CFrame, making it relative to the sphere rather than the world.

#16

Yep that works for movement, thanks. I’d have to look into how to get rotation working as well.

1 Like
#17

I’ve made further edits to the script, and I believe that the rotational movement should now function properly.

#18

First error is Couldn’t convert Vector3 to CoordinateFrame

When replacing .Position with .CFrame, the unit just flies around the earth

1 Like
#19

Okay, I’ve fixed the script. It was probably because it was relative to the world, but all I did was multiply it by the sphere’s CFrame, and now it should work without any issues.

#20

It’s stuck facing one direction and not actually rotating relative to *its current location on the sphere.

1 Like
#21

Can you try this script? I got some help from AI to correct it.

local sphere = workspace.Sphere
local part = workspace.Part

local currentPosition = part.Position
local destination = getDestination()

local sub = destination - currentPosition
local sphereRay = sphere.Size.X / 2

local totalFramesCount = 100

for i=1, totalFramesCount do
    local relativePos = (currentPosition - sphere.Position)
    local newCFrame = CFrame.lookAt((((i / totalFramesCount) * sub + currentPosition) - sphere.Position).Unit * sphereRay + relativePos, sphere.Position)
    part.CFrame = newCFrame * sphere.CFrame
    task.wait(0.015)
end
#22

Troop is floating far away from the sphere into the night sky

1 Like