How do I make child collisions stop the parent object?

Unity Engine
1

So I’m making an FPS where the player can get in a spaceship and fly between different planets.

Amusingly, the way the ship’s position would be preserved between scenes, I figured it would be easier to make the ship stay still while the rest of the universe moves around it. And it worked.

The problem is that now I can just fly straight through planets. Each planet is a child of one empty object that the ship controls.

At this point, I’m considering redoing the design, figuring that I can just make the level on each planet at the same coordinates as it’s planet object in the previous scene.

Yet still, I thought it a topic worth bringing up. Is there a way to make collision with the child objects stop the parent object from moving?

2

How about raycasting forward the amount of distance you are intending to move each frame, and if you hit the planet’s collider, then you will have a point in space where you hit it, a normal, etc. (all the usual data in a RaycastHit object you can get back from the Raycast() function) and you can do what you want to your velocity then.