Testing x value when using transform.translate

Question

I have a cube which I move using transform.Translate like this:

 transform.Translate(rate * Time.deltaTime,0,0);

I want to detect when x is a exactly specific value (for example, 10) but doing this doesn't work:

         float x = -cube.transform.position.x;   //using negative value because cube is going backwards on x-axis
         if(x == 10){
             Debug.Log("x is 10!"); //This text does not show in Console
         }

I'm guessing this doesn't work because it is going so fast that it can't exactly detect when x is 10. What options do I have here? I'm doing this for procedural generation.

Answer 1

Best Answer

Answer by Eric5h5 · Jun 05, 2013 at 06:13 PM

It will never be exactly 10.0 regardless of how fast it's going due to Time.deltaTime, and floating point imprecision. You can detect if it's greater than 10.0, or use Lerp instead of Translate.

Add comment · Show 1 · Share

Zhinkk · Jun 07, 2013 at 06:14 PM 0

Share

Thanks for the help guys. For anyone interested, I just used a different method of spawning obstacles procedurally. Ins$$anonymous$$d of detecting when x was, for example, 10, and spawning an object at that position, I just set a starting spawn position (spawnPosX) and added a value of spawnRate to it every time the next object would spawn. I know this is confusing, but I just wanted to post how I did it. If anyone has any questions, please ask!

             if(numSpawned < 14){
                 obToSpawn(); //This just selects a random object to spawn and sets it to the variable nextObj
                 Instantiate(nextObj, new Vector3(-spawnPosX, 0, 0), Quaternion.identity);
                 spawnPosX += spawnRate;
                 numSpawned++;
             }

Answer 2

Answer by darthbator · Jun 05, 2013 at 06:19 PM

Floats are never going to be accurate like that. As said in the other answer you can act on >= or you can use Mathf.Approximately

Add comment · Show 1 · Share

Eric5h5 · Jun 05, 2013 at 06:26 PM 0

Share

$$anonymous$$athf.Approximately won't be nearly approximate enough for this. It's for values that are very close to the one you're testing, which won't be the case here.

Testing x value when using transform.translate

2 Replies

Your answer

Welcome to Unity Answers

Follow this Question

Related Questions