Rotation on the World Axis Instead of the Local Axis

[ENDAWERKZ]

I have a position and rotation vector that both can be changed with user input…

local position = Vector3.zero
local rotation = Vector3.zero

…that both are used as components for a part’s CFrame.

-- in some loop
part.CFrame = CFrame.new(position) * CFrame.Angles(
  math.rad(rotation.X),
  math.rad(rotation.Y),
  math.rad(rotation.Z),
)

This is what the part looks like. The local axis are represented as parts, with the Y axis being green, the X axis being red, and the Z axis being blue.

However, with rotation configurations like this (shown below),

Changing rotation.Y rotates around the local Y axis in green…

…instead of the world Y axis in red.

(rotation showed in pink)

How would I change the script to rotate in world space (2) instead of locally (1)?

[BendsSpace]

This reply might be helpful:

@BanTech

Another option is to rotate a CFrame at the origin by the world rotation you want, then use the * operator to compound the rotation, and then again finally add the position back into it. This has the benefit of fitting neatly into a single line.

Part.CFrame = CFrame.Angles( Rx, Ry, Rz ) * ( Part.CFrame - Part.CFrame.Position ) + Part.CFrame.Position

I don't understand how to rotate stuff in world space

To rotate by world axis without any local effects, but whilst maintaining the position of the part, you’ll need to extract the Euler angles and simply add the world rotation onto it, then reconstruct a rotational CFrame from those Euler angles, and finally add the position back into it. I use Rx, Ry and Rz to represent the angle you want to turn it through in world space. local rx, ry, rz = Part.CFrame:ToEulerAnglesYXZ() Part.CFrame = CFrame:FromEulerAnglesYXZ( rx + Rx, ry + Ry, rz + Rz ) + Par…

TL;DR for what’s going on here:

If you multiple the rotation CFrame THEN the current CFrame, it rotates relative to the world. The problem is that it rotates around the world’s center, the 0,0,0 coordinate, instead of the model’s center! (So a car 50 studs from the center rotated 180 degrees like this would move 100 studs!) The trick is to recenter the CFrame to be rotated at the world’s center (0,0,0), do the world rotation, then move it back to the CFrame’s center.

[ENDAWERKZ]

Thank you so much! I’ll get back to you when I implement this