Using for as while.

Question

I need to rerandom a number each time if condition equals false. With while it would look:

 float Distance;
 float minDistance;
 Vector3 Position;

 while(Distance < minDistance)
 {
     Position = new Vector3(Random.Range(50,-50),Random.Range(50,-50),0);
 }

But using while in Update will freeze unity. So how can i do the same using "for" loop ?Thanks!

 float Distance;
 float minDistance;
 Vector3 Position;
 
 for(Distance = Vector3.Distance(transform.position,bla.position);Distance < minDistance;)
 {
     Position = new Vector3(Random.Range(50,-50),Random.Range(50,-50),0);
 }

Answer 1

Best Answer

Answer by clunk47 · Aug 26, 2013 at 05:10 PM

Unless you absolutely want to use for or while, you could just do:

     bool condition = false;
     
     void Update()
     {
         if(!condition)
         {
             //Random Range Code Here
             condition = true;
         }
     
     }

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Answer 2

Answer by roojerry · Aug 26, 2013 at 10:19 AM

The while loop works as long as you recalculate the Distance from within the loop, like so

 while(Distance < minDistance)
 {
     Position = new Vector3(Random.Range(50,-50),Random.Range(50,-50),0);
     Distance = Vector3.Distance(transform.position,Position);
 }

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$$anonymous$$ · Aug 26, 2013 at 10:21 AM 0

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Oh realy? I thoutht its always freeze when used in Update function!

$$anonymous$$ · Aug 26, 2013 at 10:22 AM 0

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Thank you very much.

fafase · Aug 26, 2013 at 10:25 AM 0

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It does not freeze, it stops it, I would not recommend to use this. The reason is simple, you are not guarantee to get a value before Christmas. It can happen right on or after 50ms or after 10s.

It is wrong to use code that you do not control the processing duration.

roojerry · Aug 26, 2013 at 10:34 AM 0

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True. I just showed how to escape the loop. Due to the randomness of your Position calculation, this would cause random stops in your execution, while waiting for Distance to be greater than minDistance

$$anonymous$$ · Aug 26, 2013 at 10:34 AM 0

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So how can i do this with for? Or anyway to do this?

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Answer 3

Answer by fafase · Aug 26, 2013 at 10:43 AM

Seeing what you are trying to achieve, let's try another way.

You want to create an object that would be outside the radius of a circle with the player position at the center.

The other way could be to first get a random direction and then get a random distance greater than distance.

 void CreateAtDistance(){
     Vector3 direction = new Vector3(Random.Range(-1.0f,1.0f),Random.Range(-1.0f,1.0f),0);
     direction.Normalize();
     float distance = Random.Range(minDistance, 50);
     direction *= distance;
     NewPosition = Position + direction;
 }

You will have to try this as I cannot...but the idea is as I said, first define a direction. Then you normalize the vector so that it has length 1. Then you multiply by a value between minDistance and max distance (I chose 50). Then you multiply the vector to extend it. Then you do an addition of the position and the direction.

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Using for as while.

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