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Rotating around a point?

Asked by
aquathorn321 858 Moderation Voter
9 years ago

How can I get a part to rotate around a point? Say I have a brick 5 units in front of a point, how would I rotate it 180 degrees around the point while maintaining its distance?

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Script-wise, or otherwise? There are alternatives. iUnEarthly 85 — 9y
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What exactly are you looking to do with this? I've got a few solutions for a few cases. User#6546 35 — 9y
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Would just writing a function for this be fine? I don't know what you want. Goulstem 8144 — 9y

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Answered by
ScriptGuider 5640 Trusted Moderation Voter Community Moderator
9 years ago

CFrame

A simple implementation of CFrame.Angles will do the trick. CFrame.Angles returns a rotation with 3 given axes (X,Y,Z), in radians.

Radians overview

In case you don't know how radians work, I'll provide a quick overview. Radians are basically a different form of measurements for a circle (oppose to degrees). But, they can work the same way. An example of radians you're probably familiar with is Pi (3.14...) which represents half a rotation in radians. Therefore 2*Pi = 360 degrees, which is a full circle in radians (6.28...)

Anyway, with that out of the way, I'll give you an example:

view source
01local Point = CFrame.new(0,10,0) -- The point the object will rotate around
02local Offset = CFrame.new(0,0,10) -- the offset of the part (distance from it)
03 
04local Object = Instance.new("Part",workspace)
05Object.Anchored = true
06 
07while true do
08 
09    -- Each iteration, we're making the Object's CFrame equal to the Point's CFrame, multiplied by the rotational CFrame, then again multiplied by the offset.
10 
11    -- "math.rad" simply converts it's numeric argument to radians.
12 
13    for i = 1,360 do
14        Object.CFrame = Point * CFrame.Angles(0,math.rad(i),0) * Offset
15        wait()
16    end
17end

Note

I'm not gonna cover the entire CFrame library, so if you're not experienced in it, I suggest this wiki page: http://wiki.roblox.com/index.php?title=CFrame#Constructors

Hope this helped, let me know if you have any questions.

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thanks, that's exactly what I was looking for aquathorn321 858 — 9y
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Is it possible to apply this to a Tween? The problem I run into is that instead of rotating *around* the point, it just goes through it, when doing a 180 degree rotation. AzrefriskDreemurr 8 — 4y
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