Here is my resaw post, a tool that I prefer by far compared to the classical resaw fence.
The main reason is that a bandsaw blade actually always does only what it wants to do, and having the fence clamped to the table very often ends up with blade warpage and some drift in the cut.
It is especially true when your blade is not new and maybe becomes to get dull.
I have an article on my website discussing that :
La Belle Note - Resawing on the bandsaw
It is a chromed piece of tubing, that is fixed to a wooden plate, which is bolted on the parallel fence of the bandsaw.
I have setscrews that allow to fine adjust the post verticality, exactly parallel to the blade.
The post must be setup to be in front of the teeth of the blade, and you must take care not to push the wood after the blade in order to avoid tightening the blade.
Then you just have to follow the line, always adjusting the angle of the wood, according to what direction wants to take the blade.
Here I'm not saying that the resaw fence or even parallel fence are not usable, I'm just saying that they require a nice sharp and properly setup blade, which necessitate a lot of time, and when you are in a hurry, and the blade is no more excellent, this tool is great.