The scenario you describe is already complex enough that I would strongly recommend using an external physics engine. I can't think of any other way of implementing this that I would personally consider as being simple.
The good news is that integrating a physics engine into your game - if done early on - is usually a very straightforward process.
Details will obviously vary from engine to engine but in most of them it consists of:
- Instatiating a
World object which will manage the simulation
- Associating a
Body object with each of your game objects, and adding them to the world.
- Updating the
World and drawing each game object using the information from their
So if for instance, you had a class like this:
You could replace the transforms information in your object with that of a physics body instead:
Of course when creating the
Body you'd need more information about its shape and behavior, e.g. you could specify the shape of the body using the model's bounding box.
Then it's just a matter of registering the bodies in the world and updating it.
// Register bodies in world
foreach(var gameObject in gameObjects)
// Update world