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Question by fabianzaf · Apr 27, 2013 at 04:02 PM · vector3anglescoperef

"ref float" is not compatible with the argument list "float"

I'm really drawing a blank as to why this is happening.

var angle: float = Vector3.Angle(v1,v2); transform.rotation.ToAngleAxis(angle,Vector3.up );

I get this error

The best overload for the method 'UnityEngine.Quaternion.ToAngleAxis(ref float, ref UnityEngine.Vector3)' is not compatible with the argument list '(float, UnityEngine.Vector3)'.

Someone told me "ref passes a reference rather than a copy, so var changes in the function propagate to caller scope" but I am not grasping the problem and how to fix this.

Any help would be appreciated!

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Answer by Dave-Carlile · Apr 27, 2013 at 04:09 PM

I believe the issue may be that you're passing Vector3.up as the vector. That is a system value and cannot be changed. Try this...

 Vector3 up = Vector3.up;
 transform.rotation.ToAngleAxis(angle, up);

If you're using C#, you also have to specify that the parameters are output parameters when you call the function...

 transform.rotation.ToAngleAxis(out angle, out up);
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avatar image Loius · Apr 27, 2013 at 04:32 PM 0
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yes, although, in this case, it is 'ref' ins$$anonymous$$d of 'out' :)

avatar image fabianzaf · Apr 27, 2013 at 04:48 PM 0
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Oh my word it was the Vector3.up? And here I was trying a million and 1 things on the float, strange why this has never happened to me before.

Thank you so much for your help!

avatar image Dave-Carlile · Apr 27, 2013 at 09:24 PM 0
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@Loius According to the documentation it's out :)

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