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  Strange issue with recursion?  (Read 262 times)
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Offline EliwoodL

Senior Newbie





« Posted 2013-12-28 21:26:07 »

So essentially, the following snippet of code loops endlessly.

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      while (parent != null) {
         System.out.println(parent);
         offset.add(offsetFromParentWithRotation());
         parent = parent.getParent();
      }


Why is that?  Am I not allowed to set the parent like that, or am I missing something very obvious?
Offline Troubleshoots

JGO Knight


Medals: 36
Exp: 7-9 months


Damn maths.


« Reply #1 - Posted 2013-12-28 21:40:44 »

Is
getParent
meant to return null? Your code does not make sense. Why are you checking whether parent is not null? Why are you using a loop? What's the point of parent.getParent()?

P.S:  Iteration != recursion. Iteration is using a loop to check a condition. Recursion is the calling of a method inside that same method.

Iteration:
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while(x < 10) {
    x++;
}

Recursion:
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int doSomethingWithX(int x) {
    if(x < 10)
        doSomethingWithX(x++);
    return x;
}

Why are all OpenGL tutorials written in Brainf**k?
Offline ReBirth
« Reply #2 - Posted 2013-12-29 13:51:46 »

Somewhere in your code you must be "recursively" set parent of a parent with itself.

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Offline matheus23

JGO Kernel


Medals: 108
Projects: 3


You think about my Avatar right now!


« Reply #3 - Posted 2013-12-29 15:40:27 »

So essentially, the following snippet of code loops endlessly.

1  
2  
3  
4  
5  
      while (parent != null) {
         System.out.println(parent);
         offset.add(offsetFromParentWithRotation());
         parent = parent.getParent();
      }


Why is that?  Am I not allowed to set the parent like that, or am I missing something very obvious?

Are you developing some kind of Bone animation code?

Its possible that you have a loop in your bones.
So that would mean that at some point the parent of one of your bones is the same bone as the bone you began with Smiley

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