Hello, beginner for about 3 weeks with UE4, I have so far only used blueprints. But having needs of a similar lookrotation function like in Unity.

While searching I found this post where the author offers a c++ code for this needed function :

https://forums.unrealengine.com/deve...se-who-need-it

Having very slight c++ knowledge, I used the provided code and created a MyLookRotation.h file and another MyLookRotation.cpp that here :

MyLookRotation.h

MyLookRotation.cpp

With this, I have a "My Look Rotation" node, however the pin target send me an incompatibility error when I want to link a component to it, and the actions for blueprint panel doesnâ€™t contain any associable object :

I searched for long hours for solutions, but my abilities in English and for c++ probably played on the fact that I can't find the solution, that's why i ask your help please.

While searching I found this post where the author offers a c++ code for this needed function :

https://forums.unrealengine.com/deve...se-who-need-it

Having very slight c++ knowledge, I used the provided code and created a MyLookRotation.h file and another MyLookRotation.cpp that here :

MyLookRotation.h

Code:

#pragma once #include "CoreMinimal.h" #include "Kismet/BlueprintFunctionLibrary.h" #include "MyLookRotation.generated.h" /** * */ UCLASS() class CAMERATEST2020_API UMyLookRotation : public UBlueprintFunctionLibrary { GENERATED_BODY() public: UFUNCTION(BlueprintPure, Category = "My Nodes", meta = (DisplayName = "My Look Rotation", Keywords="my look rotation")) FRotator MyLookRotation(FVector lookAt, FVector upDirection); };

Code:

#include "MyLookRotation.h" FRotator UMyLookRotation::MyLookRotation(FVector lookAt, FVector upDirection) { FVector forward = lookAt; FVector up = upDirection; forward = forward.GetSafeNormal(); up = up - (forward * FVector::DotProduct(up, forward)); up = up.GetSafeNormal(); /////////////////////// FVector vector = forward.GetSafeNormal(); FVector vector2 = FVector::CrossProduct(up, vector); FVector vector3 = FVector::CrossProduct(vector, vector2); float m00 = vector2.X; float m01 = vector2.Y; float m02 = vector2.Z; float m10 = vector3.X; float m11 = vector3.Y; float m12 = vector3.Z; float m20 = vector.X; float m21 = vector.Y; float m22 = vector.Z; float num8 = (m00 + m11) + m22; FQuat quaternion = FQuat(); if (num8 > 0.0f) { float num = (float)FMath::Sqrt(num8 + 1.0f); quaternion.W = num * 0.5f; num = 0.5f / num; quaternion.X = (m12 - m21) * num; quaternion.Y = (m20 - m02) * num; quaternion.Z = (m01 - m10) * num; return FRotator(quaternion); } if ((m00 >= m11) && (m00 >= m22)) { float num7 = (float)FMath::Sqrt(((1.0f + m00) - m11) - m22); float num4 = 0.5f / num7; quaternion.X = 0.5f * num7; quaternion.Y = (m01 + m10) * num4; quaternion.Z = (m02 + m20) * num4; quaternion.W = (m12 - m21) * num4; return FRotator(quaternion); } if (m11 > m22) { float num6 = (float)FMath::Sqrt(((1.0f + m11) - m00) - m22); float num3 = 0.5f / num6; quaternion.X = (m10 + m01) * num3; quaternion.Y = 0.5f * num6; quaternion.Z = (m21 + m12) * num3; quaternion.W = (m20 - m02) * num3; return FRotator(quaternion); } float num5 = (float)FMath::Sqrt(((1.0f + m22) - m00) - m11); float num2 = 0.5f / num5; quaternion.X = (m20 + m02) * num2; quaternion.Y = (m21 + m12) * num2; quaternion.Z = 0.5f * num5; quaternion.W = (m01 - m10) * num2; return FRotator(quaternion); }

I searched for long hours for solutions, but my abilities in English and for c++ probably played on the fact that I can't find the solution, that's why i ask your help please.

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