Hello, I have currently experimented CF.Rotate() method provided on Unity engine, which is able to rotate an object from a direction as shown in the following image :
I want basically to transcribe the behavior of that method on Roblox using a directional vector + an input, for example :
Part.Rotate( Part.CFrame.RightVector, 40° )
How am I able to achieve that result in Roblox ? I’ve recently got introduced to CFrames, and haven’t read the whole documentation about it… 
Do you want it to smoothly rotate?
Cause if so, use tween service to achieve this.
Simply change the orientation of the BasePart to rotate it, its one of its properties 
So by doing BasePart.Orientation you get the current orientation, then you can simply do BasePart.Orientation = BasePart.Orientation + 40 to rotate it by 40 degrees.
The goal of this is way more complex, I’m not searching to lerp it or rotating it smoothly, I want to rotate it relative to the given direction…
My apologies, you can do this through doing :ToWorldSpace() so its relative to itself, you can read more in this article:
https://developer.roblox.com/en-us/articles/Understanding-CFrame
Which has relative rotation.
I mean, that’s not really what I need… I’ve said I want to get the behavior of that method on Roblox…
i think you are looking for the CFrame.fromAxisAngle(dir, rotation) constructor:
local dir = Part.CFrame.RightVector
local Angle = math.rad(40)
local Rotation = CFrame.fromAxisAngle(dir, Angle)
local CF = Rotation + Part.PositionAh, right. This is my field of ‘expertise’ right here.
I would definitely go for, and use the method CFrame.fromOrientation(rX, rY, rZ) to apply orientation to a BasePart.
Where rX is up/down, rY is left/right and rZ is tilt left/right. Oh, and remember, these rotations are in radians. To convert degrees to radians, simply use math.rad(deg) or math.deg(rad) for radians to degrees. Also, remember that the symbol * is basically the same as addition +, just for CFrames.
You can…
a) Apply orientation to an existing CFrame.
BasePart.CFrame = BasePart.CFrame * CFrame.fromOrientation(math.rad(30), 0, 0)
Or…
b) Construct a new CFrame with the desired orientation that you want.
BasePart.CFrame = CFrame.new(0, 5, 0) * CFrame.fromOrientation(math.rad(30), math.rad(90), 0)
Useful resources:
Try this out, and don’t forget to play around!
Well, I’m slightly confused then because from the example you provided of what you want :ToWorldSpace(), which is how you rotate something relative to its current orientation a specified amount, whereas running multiplication as you normally would is relative to the world itself?
Seeming as we use x y z, by changing the x y z values you’d be rotating around the specified axis. And so if you only want to rotate around a singular axis you’d do Cframe.Angles(0,0,math.rad(7)) for the z component only.
I dont know what CF.Rotate does in Unity, but in roblox we rotate parts with using CFrame.Angles(), so we can rotate a part like this:
Part.CFrame = Part.CFrame * CFrame.Angles(math.rad(30), 0, 0)Haha, I used to bring a lot the function fromOrientation() to solve my problems, but in that case it would in no way fix the problem. I given a method that rotates FROM a directional vector, a total different case.
Which concerns your answer format, I really like it and it’s very intuitive ! Keep it up.
If it didn’t answer what you were asking about, what are you really asking about then?
It appears to be what I was searching for, thanks ! As I said I haven’t experienced every methods that Roblox provides.
To explain more what the method does, as I’m very bad at explanations I’ll provide a video of those explained at the precise timecode…
I’m not particularly sure how you can rotate a part 40 degrees in the “RightVector” as you showed because thats not how angles work.
What I have been trying to say is that by doing :ToWorldSpace() with an angle in the brackets you rotate it relative to the parts current orientation, with the rX, rY and rZ being the different ways you can orientate a part…
By looking at your video, if you want to do it relative to the world space then it would simply be:
Part.CFrame = Part.CFrame * CFrame.Angles(math.rad(40), 0, 0) -- this would be 40 degrees in the x axis relative to the world.
With the parameters being:
CFrame.Angles(rX, rY, rZ) where:
Uhm… no. On the contrary actually. This would be relative to the current CFrame.
I don’t really how to explain that, I’ve tried to give the more informations through my links and images…
I have found on the documentation related to that method these arguments :
And here, once again the source
Drawing is some times the best way to illustrate what you mean.