I'm making a 2D platformer game and I'm having a hard time figuring out how to fine-tune parallaxing objects in-game quickly enough. Problem is I don't even know how to make it faster, so I'm basically looking for standard approaches.
Currently I place a parallaxing object just like a normal static doodad somewhere on a level and then define the parallax offset multipliers (horizontal and vertical). Then I spend from five to ten minutes moving the camera around the location finding three values that satisfy me. So when placing each object takes that long, you start thinking of a way to make it faster, but unfortunately, I couldn't come up with anything better than what I have, so I'd like to learn about other approaches and possibly improve mine with that knowledge.
What are the usual approaches to placing and tuning the parallaxing objects in 2D games?