Different views for physics working

Hello.

I'll try to be short. There is 2D physics. There is a ground(big plane or number of boxes - doesn't matter). On the ground there is a springboard. There is a car.
So there could be 2 situations: either we could move the car towards the springboard or we could move groud towards the car. Mr.Enstein would probably say that there is no difference. And I would say the same. However in Unity there is difference. In the case when ground is moving towards the car the car is not gathering the desired altitude when jumping after springboard. I wonder why it is so ?

Thanks in advance.

 

I am writing an infinite runner in 3D. Since the car is moving only forward I use 2D physics. The ground is static, but the springboard is not. Ground is a large box(collider) that not moving. The car is also not moving. Only the springboard is moving towards the player(car).

The structure is following: there is levelgenerator object at the top of hierarchy, and it has children(springboards) that are colliders. So I move levelgenerator object by physics in a following way:

Code (CSharp):

1. m_rigidbody.MovePosition(transform.position - dir);

 

Move the car using physics (force and velocity) and move everything so that car is in screen center in LateUpdate. (transform.position = ...)

Best of both worlds.

 

Tried now to move the world using velocity. It moved several seconds and suddenly stopped. The velocity is changed to zero vector and there is no way to turn it back. I suspect something is preventing it to move further. Investigating.

 

Indeed there were obstacles that was preventing world to move. Fixed it. But still the car isn't gathring correct altitude: as long as the car leaves the springboard it loosing the altitude, but the car should have some inertia and increase altitude some time.