Strange FRotator Values

Development Programming & Scripting
1

Hi I am getting really strange results from my FRotator results.

FRotator ACharacterFinalCharacter::CameraRotation()
{

	const FRotator cr = GetControlRotation();
	const FRotator ar = GetActorRotation();

	const float newpitch = cr.Pitch;
	const float newyaw = cr.Yaw - ar.Yaw;

	UE_LOG(LogTemp, Warning, TEXT("Yaw: %d, Pitch &d"), newyaw, newpitch );

	const FRotator truerotation = FRotator(newpitch, 0, newyaw);

	return truerotation;
}

My results are coming out “LogTemp:Warning: Yaw: -2147483648, Pitch 536870912”. It will be much appreciated if someone can explain to me why I am getting these results. Thanks.

2

True to log the value of cr and ar right after you create those variables. If your Controller is null it might be returning weird values like -2147483648.

The best way to check this is to log the variables. If you’re still getting errors let me know and i’ll try give you more help.

3

Thanks for the reply, Just tried what you suggested still getting strange results.

 FRotator ACharacterFinalCharacter::CameraRotation()
 {
 
if (Controller == NULL) return;

	const FRotator cr = GetControlRotation();
	const FRotator ar = GetActorRotation();

	UE_LOG(LogTemp, Warning, TEXT("Control = Yaw: %d, Pitch %d"), cr.Yaw, cr.Pitch);
	UE_LOG(LogTemp, Warning, TEXT("Actor = Yaw: %d, Pitch %d"), ar.Yaw, ar.Pitch);

	const float newpitch = cr.Pitch;
	const float newyaw = cr.Yaw - ar.Yaw;

	//UE_LOG(LogTemp, Warning, TEXT("Yaw: %d, Pitch %d"), newyaw, newpitch);
 
     const FRotator truerotation = FRotator(newpitch, 0, newyaw);
 
     return truerotation;
 }

Results are:

LogTemp:Warning: Control = Yaw: -1073741824, Pitch 1610612736

LogTemp:Warning: Actor = Yaw: 1073741824, Pitch 0

4

It looks like your Controller doesn’t have a rotation, and so you get these weird negative values. I’m not sure why this is happening, but it might pay to make sure you’ve set the controller up properly

5

Well this is from the default C++ Third Person example, so its all setup with a controller. I also did a test with the C++ First Person Example with the same results.

6

I’ll see if i can recreate this tomorrow in the engine and get back to you with a solution if I find one.

7

“%d” is for integers, rotation values are floats. Try changing to:

     UE_LOG(LogTemp, Warning, TEXT("Control = Yaw: %f, Pitch %f"), cr.Yaw, cr.Pitch);
8

That worked, Always the silly little mistakes that gets past. Anyways thanks for the replies much appreciated.

9

No problem.

As a reference, UE4 UE_LOG( ) should follow the same rules as this:

http://www.cplusplus.com/reference/cstdio/printf/