How would I figure out the opposite vector of CurrentCamera.CFrame?

What do you mean by â€śoppositeâ€ť here? Just looking the other direction? The inverse? Upside-down?

Looking the other direction

Your post isnâ€™t very clear, could you provide a visual or example of what you are trying to accomplish? Are you looking for the opposite direction the player is looking, Something like

`-CFrame.lookvector`

?

https://developer.roblox.com/en-us/api-reference/datatype/CFrame

Useful article:

https://developer.roblox.com/en-us/articles/Understanding-CFrame

Yeah! Imagine rotating the CFrame 180 degrees on the y-axis. This is enough as I only intend to use the y-value of the CFrame. I multiplied the CFrame with CFrame.Angles(0,math.rad(180),0) to fix this. Is this the easiest way?

Itâ€™s unclear what â€śopposite vectorâ€ť refers to but as mentioned above, simply applying a negative would give you the opposite vector. Thatâ€™s assuming youâ€™re using the Look, Right or Up vector to get a Back, Left or Down vector. A rotation should work, you can test that out for yourself to know more quickly than waiting for a response here.