Inconsistent Top Speeds On Player

Questions & Answers
1

I have this code set up on my player to limit how fast they can go:

    private void FixedUpdate()
    {
        //Moves the player up to top speed. if greater than the top speed, doesnt add force.
        if (inputLR > 0 && rb2d.velocity.x < topSpeed)
        {
            rb2d.AddForce(Vector2.right * inputLR * moveSpeed);
        }
        else if (inputLR < 0 && rb2d.velocity.x > -topSpeed)
        {
            rb2d.AddForce(Vector2.right * inputLR * moveSpeed);
        }
    }

I have used this code on a similar project (in unity 2018.3.9f1) and it worked perfectly for me, allowing me to reach exactly what the top speed is set to no problem. But now, I used that same line of code again (in unity 2019.1.7f1) and I am getting velocities of varying amounts. I have no clue what is going wrong!

If I set the top speed to 12, the player will speed up to a velocity of 11-14 and maintain that velocity until the button is let go. This velocity that it decides to maintain seems completely random.

Is there something I am doing wrong here? Should I just scrap this code and redo it differently?

2

If you want to limit the velocity to topSpeed you should just do this in FixedUpdate:

rb2d.velocity = Vector2.ClampMagnitude(rb2d.velocity, topSpeed);

Though if you also want to move on the y axis and don’t want to limit the y axis as well, you have to do

Vector2 vel = rb2d.velocity;
vel.x = Mathf.Clamp(vel.x, -topSpeed, topSpeed);
// maybe clamp vel.y in a similar way but with other min and max values?

rb2d.velocity = vel;