Bumper physics not working,

Questions & Answers
1

Hi guys, I’m starting a 2D platformer and when implementing a bumper-type obstacle I encountered a problem. The way the bumper is supposed to work is by detecting a collision with another object in OnCollisionEnter2D(), finding the contact point and normal, then adding an Impulse force to the opposite direction of said normal.

It works fine for vertical bumps, but when hitting the bumpers with horizontal motion, the player just kind of sits there. Here is the code for the bumpers:

private float bumperForce = 10f;
    
    void OnCollisionEnter2D(Collision2D col) {
        
        ContactPoint2D[] otherObjects = col.contacts;
        foreach(ContactPoint2D contact in otherObjects) 
        {
            var norm = contact.normal;
            col.rigidbody.velocity = Vector2.zero;
            contact.rigidbody.AddForce( -1 * norm * bumperForce,  ForceMode2D.Impulse);
        }  
    }

And here is my movement script (the important part, at least):

void FixedUpdate()
    {
        // Jump force
        if (jump)
        {
            PlayerRigidbody.AddForce(new Vector2(0f, JumpForce), ForceMode2D.Impulse);
            jump = false;
        }

        // Move the character by finding the target velocity
		Vector2 targetVelocity = new Vector2(horizontalMove * speed, PlayerRigidbody.velocity.y);
		// And then smoothing it out and applying it to the character
		PlayerRigidbody.velocity = Vector2.SmoothDamp(PlayerRigidbody.velocity, targetVelocity, ref m_Velocity, m_MovementSmoothing);

    }

And here is a short video of the bumper in Play mode:

Any ideas?

2

Hi! I can see that you’re using a solid collider, istead try using a trigger collider an OnTriggerEnter function.
When you use a solid collider instead of a trigger, the collision occurs and its calculated, you’re probably getting stuck because of the friction between the collider and your character collider. Change it to trigger.
Hope this helps!