Enabling С++ do not prevent you from using blueprint at all. All blueprint features will still working in cpp project
Hello! I’m completely new to UE4.
I’ve discovered how powerful is the Blueprints Visual Scripting, but I have the feeling that when the control became really strict to the developer, it’s hard to achieve that with Blueprints, so I need the programming approach.
One simple example: let’s suppose I want to make a simple running ball game with procedural content generation. With blueprint I can manage events like collision, but what about the procedural content generation? I can easily create an custom algorithm on my own, but to do the same in Blueprints setting all nodes will be hard.
So my question is: is it possible to use both in a project? Is it a good idea to use Blueprints wheter it’s easy and using c++ algorithms for example AI part of the project?
Yes, you can use Blueprints and C++ together. In C++ you’ll use UFUNCTION() to define whether or not blueprints can access it, what it can do with it and what it requires to operate. I don’t think it’s bad to use blueprints - when packaging most of this should be optimized to C++ and then compiled anyway, and C++ is also a very powerful tool to have available.
You can definitely do a lot of AI related shenanigans from C++, we’re doing that atm with a bachelor thesis.Part of our project involves exposing the work we’re doing to blueprints as well to create a user-friendly experience. 
Yes it is possible. I’ve done it already. Here are things that you have to keep in mind, tho :
- They cannot always communicate directly, as BP is not C++ until you compile them. BP can communicate with C++, but the other way around is more complicated.
- Get ready for a shitstorm of casts and UFUNCTION(), get ready to have a millions functions if you are doing your own pawn with replication capability.
- I strongly advise you use C++ to make your base classes, especially abstract classes, and then right click and your class > make BP from class to create a BP in which you will easily put a mesh, etc, using the viewport. This is way easier than guessing the position of every component with C++ functions.
All in all, everything that is abstract is better done in C++, at least because you don’t need 15m² of space just to make a simple formula. The rest can be done in BP. To communicate, the best way IMO is to have a C++ class for every BP so you can simply cast your BP to it and use every functions in the C++ class.
EDIT : Let me give you an example of what I had to do. So I had a building (HQ_BP) that the player could build. The base C++ class was abstract (HQ), and was derivated into a HQ_BP class so that I could move my components using the viewport. Every functions I needed were in the C++, so that the BP was purely cosmetic. When I had to deal with the HQ in my C++ were all my logic was, I could simply cast the HQ_BP to the HQ and use every functions I needed. To create an instance of my HQ_BP from C++, I used a ConstrutorHelper to find my BP file (I don’t think this is the best way, but that works).
Now, If you were to try it the otherway around, that is, doing a BP with a lot of functions and try to call them from a C++ file, I think you’ll gonna have a bad time. This is what I mean by “uncompiled C++”. Maybe things have change since, but I’m not sure about that.
Yeah mistake, it’s C++ to BP which is more complicated, because BP is uncompiled C++, so you have to use ConstructionHelper or use some parameters for your variable (like BlueprintEditable or I don’t remember which).
But isn’t there like a bake BP function ? Maybe it’s easier if we can do that. Honestly, I’m clueless on that. I just remember that doing C++ was very cumbersome when having to deal with BP. I followed some advice and did what I told him to do : Make a C++ class with all the functions you need + components and then make a child BP of that class to arange your components. From there is it possible to use every C++ functions.
What do you mean BP to C++ is more complicated? I honestly haven’t noticed a difference between BP to C++ function and BP to BP function.
Honestly not sure I follow your sequence of actions, but I’ll take your word for it. I’ve only played around with using C++ functions in Blueprints, implementing C++ functions in Blueprints and that kinda stuff. Never the other way.