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Want to know the reason of the crash

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    Want to know the reason of the crash

    Hi everyone.... I was getting a weird crash but I was able to fix it. I want to know the reason of why I was getting the crash.

    Here is the code that. I am removing the non relevant parts.

    Code:
    	FVector OrbitVect = RandStream.VRand();
    	OrbitVect.Z = OrbitVect.Z / 45; // Makes the orbits flat
    	FRotator RevTilt = OrbitVect.Rotation();
    	FPlanetDataBase FirstPlanet(FirstPlanetDis, RevTilt.Quaternion(), 1, Angle, RevRate);
    	for (int32 i = 1; i < NoOfPlanets; i++)
    	{
    		OrbitVect = RandStream.VRand();
    		OrbitVect.Z = OrbitVect.Z / 45;
    		RevTilt = OrbitVect.Rotation();
    		FPlanetDataBase NewPlanet(NewDistance, RevTilt.Quaternion(), LastIndex + 1, Angle, RevRate); // This caused the crash
    		TempStruct.Planets.Add(NewPlanet);
    	}
    The code compiled fine but when I played the game, the engine crashed with error line shown as above.

    I solved it by this method and this works.

    Code:
    	FVector OrbitVect = RandStream.VRand();
    	OrbitVect.Z = OrbitVect.Z / 45; // Makes the orbits flat
    	FRotator RevTilt = OrbitVect.Rotation();
    	FPlanetDataBase FirstPlanet(FirstPlanetDis, RevTilt.Quaternion(), 1, Angle, RevRate);
    	for (int32 i = 1; i < NoOfPlanets; i++)
    	{
    		OrbitVect = RandStream.VRand();
    		OrbitVect.Z = OrbitVect.Z / 45;
    		RevTilt = OrbitVect.Rotation();
                    FQuat NewQuat = RevTilt.Quaternion();
    		FPlanetDataBase NewPlanet(NewDistance, NewQuat, LastIndex + 1, Angle, RevRate); // This caused the crash
    		TempStruct.Planets.Add(NewPlanet);
    	}
    Any reason what was causing the crash?

    #2
    my only guess is that RevTilt.Quaternion() is still considered a rotator when passed into the function.

    Comment


      #3
      Which version of the engine itself are you compiling against?
      There've been a few issues with FQuats causing crashes in release builds due to SSE optimisations expecting data to be aligned - eg https://answers.unrealengine.com/que...parameter.html .
      If the issue is occurring in Debug builds for you, this probably isn't related, but if you're using a binary release or are building in Development/shipping, would you mind looking at the disassembly where the crash occurs and pasting it here?
      If it's the same issue, the crash will occur on a movaps instruction or another one expecting aligned operands.

      Comment


        #4
        I am using 4.5.0 version. I am using the Binary release and Development Editor. I will into the disassmebly and paste it here.

        Comment

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