floating on water physics

Questions & Answers
1

In this 2D platform game im using the character platform controller to move around my character.
I made this box of water and when u get in u should be able to swin in, sink, and float and move on the surface unless when i press down i ca swin underwater again.

i already have most of it done, my main problems are when im on the surface, i have 2 colliders for the water, one in general and another just for the surface, my 3 problems are, i cant jump when floating, cant go underwater either, the floating system is far from what im looking for.

just showing some example of wat im using to make the character float on water and jump, im using the ‘MoveTowards’ function to force the player to float on the surface but as u cant see its using all axes instead of only the y axes because i dunno how to fix that

function OnTriggerStay (hit : Collider)
{
	if(hit.gameObject.tag == "WaterSurface")
	{
		WaterSurfaceTouch = true;
		movement.gravity = 0;
	    movement.maxFallSpeed = 0;

		if (WaterSurfaceTouch == true)
	    {
			gameObject.transform.position = Vector3.MoveTowards(transform.position, target.position, speed * Time.deltaTime);
        }

        if(Input.GetButtonDown ("Jump"))
		{
			myNewVelocity = Vector3(0,26,0);
			setVelocity.SetVelocity(myNewVelocity);
		}
	}
}

any kind of tip would be nice

3

It seems this code would push the player towards the center of the trigger. If you want to just push it to the water height, use Mathf.MoveTowards instead:

  if (WaterSurfaceTouch == true){
    transform.position.y = Mathf.MoveTowards(transform.position.y, target.position.y, speed * Time.deltaTime);
  }

This will move the player only vertically to the same target y coordinate (whatever target is).

2

I would suggest adding force based on how submerged the object is. However because you’re using a CharacterController not a rigidbody you will need to apply the .Move() function instead of .AddForce().

Without writing this for you, take the depth (height) of the water, get the distance between the bottom of the character and the bottom of the water (probably via raycast) and apply an upward movement based on the distance. It will take a little tuning to get it to look right but is the nicest way outside of rigidbody controllers to achieve a bobbing in water effect.