Isometric jump physics

Im trying to figure out how to control jump physics in a 3d isometric environment. Im basically looking for the same type of movement as in mario rpg. All the jump physics tutorials i can find are for 2d. im trying to figure out how to do it in a 3d environment. I’ve gotten the basica 2d/3d movement such as walking and climbing ladders, but the jumping i can’t figure out without it looking wierd.