Unreal How To

Useful links

• Blueprint Editor Cheat Sheet

Macros

Names	Definition	Example	Arguments
TEXT
GENERATED_BODY	engine linking.
UPROPERTY	Used above a property (int, float, string, ...)	`UPROPERTY(EditAnywhere)``int32 TotalDamage;`	*EditAnywhere*: Allow to expose a property to the editor. *Category:* Create a section to regroup properties together *BlueprintReadWrite:* Expose the property to Blueprints with write access. *BlueprintOnly:* Expose the property to Blueprints without write access (`const`). [More here](https://docs.unrealengine.com/en-US/Programming/UnrealArchitecture/Reference/Properties/Specifiers)
FORCEINLINE
UCLASS	The class is knew to the garbage collector / reflexion
UFUNCTION	Used above a function		`BlueprintPure` : Allow to call the function in blueprints. Shouln't modify something. Fast call that would frequently change. `BlueprintCallable` : Allow to call the function in blueprints. Expensive calculation that wouldn't change often. `BlueprintNativeEvents` : Allow to specify a C++ behavior that can be used or override directly in blueprint. `BlueprintImplementableEvent` : Don't have to specify a C++ implementation. Only specify a blueprint version.

Functions

• PostInitProperties()

• PostEditChangeProperty()

Commun Errors

• fatal error C1853 : Delete the build folder (Intermediate > Build).

• Do not put anymore "#include" under the "#include xxxx.generated.h" in the header file.

In blueprint mode

• Events: Red border on top.

• Functions: Blue with f.

Tips

• Refresh Intellisense: Build solution >> Close VS >> In the editor File -> Refresh VS Project >> File->Open VS >> Wait 5-10 secs.

• Level blueprint (Select it in the scene + Right Click in blueprint): Add nodes concerning a specific objet : Select it in the scene + Right Click in blueprint.

• Class blueprint (Select it in the class blueprint + Right Click): Add nodes about a specific componants.

• Event tick are executed every frame.

Acknowledgements

Based on the following links :

• Introduction C++ Unreal

• Unreal main documentation

• UnrealVS installation

• Unreal setup in VS

• Intellisense refresh