In this lesson, you will learn how to create and manage custom collision presets to ensure consistent physics behavior across your project’s various actor classes.
The Problem with Default Settings
When you start a project, you often rely on built-in presets like Pawn or BlockAll. However, as your game grows, you might find yourself manually configuring the collision settings for every new enemy, projectile, or interactable item. If you decide later that "all projectiles should pass through triggers but hit walls," updating every single actor is error-prone and tedious. This is where Custom Collision Presets save the day.
Defining Your Preset
By creating a named preset, you encapsulate a specific "Collision Response Matrix" into a single, reusable template. Think of it as a style sheet for physics: instead of setting individual rules for every object, you assign a profile name.
To define these, navigate to Project Settings > Collision. Under the Presets section, click the plus icon to add a new one (e.g., ProjectileStandard). You can then define exactly how this preset interacts with your WorldStatic, Pawn, or custom trace channels defined in previous lessons.
Applying Presets in Blueprints or C++
Once defined, you apply these settings in your actor's Collision component settings under the Collision Presets dropdown. Instead of "Custom," you select your newly created ProjectileStandard.
If you are working in C++, you can set this programmatically in your constructor:
// Applying a reusable preset to a collision component
CollisionComponent->SetCollisionProfileName(TEXT("ProjectileStandard"));
Streamlining Workflow
By standardizing these profiles, you decouple the physics behavior from the actor implementation. If your design team decides that all projectiles should now trigger overlapping events on a specific actor type, you only need to update the ProjectileStandard preset in your Project Settings. Every actor using that preset will automatically inherit the change, drastically reducing the risk of bugs and keeping your physics interactions predictable across the entire game world.
Key Takeaway: Custom Collision Presets allow you to centralize physics logic, ensuring that your game's objects interact consistently and making global gameplay tweaks as easy as editing a single configuration file.