Slope polygon collider 2D causing box collider 2D to 'bump' while sliding on it

Question

I'm doing procedural terrain generation. So far I've created the mesh, and attached a 2D polygon collider to it. The terrain is made up of hills going up and down.

After doing so, I put a 2D rigid body, along with a 2D box collider to represent the player. When I put the player on top and let him slide all the way down, sometimes he doesn't slide properly, and instead bumps on the hill, jumping all of a sudden on his own as if he tripped on something (even though there's nothing there). What's weird is that it doesn't happen all the time, just sometimes. Even when I make him slide on the same spot he bumped before again, he wouldn't do it again except on rare occasions.

What could be causing this?

Answer 1

I had similar issue, but my character stopped at some points. After adjusting rigidbody mass and physics material friction, it worked. Maybe it will work in your case.

Answer 2

Try detect the collision and set the vertical velocity to zero.

void OnCollisionEnter2D(Collision2D col)
    {
        if (col.gameObject.name.StartsWith("block"))
            rigidbody2d.velocity = new Vector2(rigidbody2d.velocity.x, 0);
    }