head to: C:\Users\<NAME>\AppData\Local\SWTOR\swtor\settings
open: client_settings
paste in:
AntiAliasingLevel = 8
(at the end of the [renderer] section)
so it looks like this:
[Renderer]
D3DFullScreen = true
Height = 1080
NativeHeight = 1080
NativeWidth = 1920
TextureAnisotropy = 16
Width = 1920
WindowX = 0
WindowY = 0
MeshLODQuality = 1
FullScreen = true
AntiAliasingLevel = 8
then save and close & launch the game!
(you can also change the 8 to 16, 4 or whatever you wish.
*for ati cards just force antialiasing on in the catalyst control panel.