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Question by ina · Nov 02, 2011 at 08:01 AM · camerarotationquaternionnan

Checking for quaternion values to not be NaN

Every so often, a camera rotation script would output (NaN,NaN,NaN,NaN) for rotation... Is there a way to check for output that is not NaN before assigning the rotation?

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Answer by dentedpixel · Jun 02, 2013 at 08:41 PM

 if(!System.Single.IsNaN( someVariable ))
   // assign rotation
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Answer by Paulo33 · May 09, 2014 at 05:30 PM

Well, i know this is a old post but, i will help others with simple soluction for check if "float variable" is a NaN or not.

 if(float.IsNaN("YOURFLOATVARIABLE")){
       //Your condition...
 }
 else{
       //Your "else" condition
 }
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Answer by DMGregory · May 09, 2014 at 05:44 PM

I have problems with either NaN or a zero quaternion showing up from time to time, and throwing an error somewhere inside Quaternion.Lerp.

To deal with that, I like to use an extension method - I keep a static class with a few of them in each project, utilities to do things like check if a UnityEngine.Object is null off of the main thread. Here's just the relevant part:

 public static class UnityExtensionMethods {
     /// <summary>
     /// Determines whether the quaternion is safe for interpolation or use with transform.rotation.
     /// </summary>
     /// <returns><c>false</c> if using the quaternion in Quaternion.Lerp() will result in an error (eg. NaN values or zero-length quaternion).</returns>
     /// <param name="quaternion">Quaternion.</param>
     public static bool IsValid(this Quaternion quaternion)
     {
         bool isNaN = float.IsNaN(quaternion.x + quaternion.y + quaternion.z + quaternion.w);
 
         bool isZero = quaternion.x == 0 && quaternion.y == 0 && quaternion.z == 0 && quaternion.w == 0;
 
         return !(isNaN || isZero);
     }
 }

This lets me write

 if(myQuaternion.IsValid())

before using a quaternion in any Lerps or assigning it as a rotation.

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Answer by tonehog · Nov 02, 2011 at 09:34 AM

This worked on my browsers JS console:

 if (!NaN) console.debug("HI");

Hope this helps.

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