3d model physics engine

Hello. Can there be a new physics engine specially designed for 3d models?

It is because I need a way to add gravity on the Z axis.

I am making a 3d game and I am using the editor in such a way that it resembles the Top Down behavior. But the Z axis can be used to make the player fall or jump. Like shown below:

I downloaded some other extensions which provided physics for 3d objects but it wasn’t exactly what I was looking for.

So can you kindly add an option for gravity on the Z axis like how there is gravity for X axis in the World Gravity action of Physics engine 2.0?



I was to post the same request after watched this video at the minute 3:00: https://www.youtube.com/watch?v=4lj2ufANozE