Velocity being setting to 0 before I can test it's value

Questions & Answers
1

Hey. I am a beginner making a simple lunar lander and I’m having trouble testing for velocity when the lander hits the ground. The problem is that my velocity is set to 0 as soon as the lander collides with the ground so when I test to see if it was above the threshold it will always return as no.
Here’s the code:

void Update()
{
    //basic move controls
    if (Input.GetKey("up"))
    {
        rb2D.AddForce(transform.up * thrust);
    }
    if (Input.GetKey("left"))
    {
        transform.Rotate(0, 0, rotateSpeed);
    }
    if (Input.GetKey("right"))
    {
        transform.Rotate(0, 0, rotateSpeed * -1);
    }
    //for DeBug purposes
    if (Input.GetKeyUp("l"))
    {
        print(rb2D.velocity.x);
        print(rb2D.velocity.y);
    }
}
void OnCollisionEnter2D(Collision2D collsion)
{
    float crashVelocity = 3.0f;
    //check if X velocity is too high
    if (crashVelocity < Mathf.Abs(rb2D.velocity.x))
    {
        print("CRASH X");
    }
    //check if Y velocity is too high
    if (crashVelocity < Mathf.Abs(rb2D.velocity.y))
    {
        print("CRASH Y");
    }
}
2

Save the velocity to a variable in FixedUpdate() and use that.
AddForce should be in fixed update or else it’s framerate-sensitive.

3

Thanks for the quick response. worked like a charm