Trying to rotate two specific points at the center of a cylinder in such a way that when I put a 90degree pipe on those points in unreal, the pipes will be facing downwards, to simulate going into the ground.
Looked into using quaternions for this approach but I cant seem to get the rotations I desire.
Without any angle manipulation the situation looks like this, where the pipe isnt facing the cyclinder and the bottom part is floating up instead of facing down:


Applying 90 degree turns to rectify this situation, somehow ends up with pipe that visualy look like they were turned 45 degrees



No idea on what I am misunderstanding about the situation.