Playing chord changes on bass is not very common, but it can help you develop your playing, the way you play solos and your flexibility on the instrument overall.
The general idea is to play voicings that consist of three notes (usually the root, the third and the seventh).
When you are playing V-I changes, the third becomes the seventh and vice versa.
Example: G7 (g,b,f) -> Cmaj7 (c,e,b)
G..........16.(3)...........16...(7).............. ...................
D..........15.(7)...........14..(3)............... ...................
A.............................15....root.......... .....................
E..........15.root................................ .....................
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