CODEWITHSUNDEEP
c#unity-game-engine
sammekekko
sammekekko

Reputation: 25

If position is position

this is my code in Unity, I've been trying to see if the rb's position is equal to cameraPos position but it doesn't work(nothing happends) 

public Rigidbody2D rb;
Vector2 cameraPos;

void Start ()
{
    cameraPos = new Vector2(0f, -3f);
}

if (rb.position == cameraPos)
    {            
        print("Continue");
    }

Upvotes: 1

Views: 315

Answers (1)

derHugo
derHugo

Reputation: 90630

Note that two positions might never be exactly equal especially if using RigidBody without a PlayerController because movements might actually "jump" between to frames.

The == operator you are currently using actually uses approximation but only to an accuracy of 1e-5 (0.00001) of the float values. This can lead to a little misunderstanding but it only means that e.g. (0.99999, 0.99999, 0.99999) == (1,1,1). Anything more appart won't match.

You should rather use an approximation instead e.g. using Vector3.Distance for checking if the objects are less then X meters appart where you can make X now greater or also smaller than 1e-5. In this example it should match if the objects are closer than 10cm:

public Rigidbody2D rb;
Vector2 cameraPos;

// Set the threshold in meters
public float Threshold = 0.1f;

void Start ()
{
    cameraPos = new Vector2(0f, -3f);
}

if (Vector3.Distance(rb.position, cameraPos) <= Threshold)
{            
    print("Continue");
}

Depending on your needs you can than adjust the Threshold to be wider or more exact.

Alternatively you could as well use Collisions / Rigidbody.OnCollisionEnter for tracking if certain objects are "close enough" / touching each other. Advantage of this approach is that you don't only know if the positions are close but also with which velocity both objects met.

Upvotes: 2

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