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Showing posts from April, 2021

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Tower Defense Starter Kit Tutorial: How to set up Global Ability Deployment

on April 23, 2021

Abilities Actor Tags Blueprints Targeting Reticle Tower Defense UE4 Unreal Engine

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Rohit Kotiveetil

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Unreal Engine Tips: Fixing "Unknown structure" Packaging Error

Lately, I've been doing some freelance work on the side for some of my UE4 marketplace customers who required custom modifications for the blueprint templates. And one of these projects has a heavy focus on data-driven design through the use of Structures, Data Tables, Data Assets, etc. Without going into specifics, the advantage of doing so is essentially to enable the customer to make changes to the project mostly through data without tinkering with blueprint logic. While working on this project, I recently had to make some changes to a Structure which was being used across a lot of blueprints. After doing some testing, everything seemed to be working fine, with no compiler errors or gameplay crashes. So I decided to wrap it up and package the project, but then the packaging process failed and threw a whole bunch of "Unknown structure" errors. And it had to do with the edited structure. Granted the errors show the blueprints that contain this structure, but disconnectin

Unreal Engine Tips: How to use Keyboard Inputs when Input Mode is set to UI Only

I had recently migrated some of the HUD workflow from Prototype Menu System to Tower Defense Starter Kit. While going through the HUD blueprints, I noticed that the Input Mode was being set to Game and UI when activating the Pause Menu. Since I didn't want the player to have the option to interact with the game outside of the menu in this state, I went ahead and changed it to UI Only, only to find out that the Escape button could no longer be used to quit the Pause Menu (in spite of it being set to Execute when Paused). It turns out that setting the Input Mode to UI Only also prevents us from interacting with the UI using keyboard. At first, it seemed like I'd have to revert it back to Set Input Mode Game & UI. But further inspection led to a workaround to tackle the issue: Handling the keyboard input directly through the widget itself instead of the player controller. The first step is to ensure that the widget can be focused. We can do this by setting its IsFocusable

Unreal Engine blueprints finally gets an "Add Component by Class" function!!

Adding components to an actor at runtime has always been kind of messy if you've been using blueprints in Unreal Engine. There was never a generic function like "Spawn Actor from Class" where you could just happily plug in the required class and be done with it. Instead when it came to components, we always had to specifically add each type of component by name. For example, given below is a scenario where I'm adding a couple of components to provide an actor with Damage Buff and HP Regen abilities: As you can see from the screenshot, I'm using an enum to first determine which component has to be added, and then adding the associated component on a case by case basis. This might not seem like an issue here given that we have only two of these, but it feels like redundant busywork once we start dealing with a dozen or more of these components. The UE4 blueprint community has been asking for a generic class based component spawning system for quite some time. And fi

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