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Unreal Engine Flashcards

7 cards from real Unreal Engine practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which rendering path in Unreal Engine 5 uses a fully dynamic global illumination system based on voxel cone tracing and screen-space techniques?

    Answer: Lumen

    Lumen is UE5's dynamic global illumination system that provides real-time indirect lighting without baking.

  2. In Unreal Engine, what is the purpose of a 'Gameplay Tag'?

    Answer: A hierarchical string identifier used to classify actors and abilities

    Gameplay Tags are hierarchical string identifiers (e.g., 'Ability.Jump') used to classify and query game objects without hardcoded enums.

  3. What does the 'volatile' keyword do when applied to a replicated property in Unreal Engine's networking system?

    Answer: Forces the property to replicate every tick regardless of change

    Marking a replicated property with UPROPERTY(ReplicatedUsing=...) alongside the correct RepNotify forces retransmission; 'volatile' in the context means no delta compression.

  4. In Unreal Engine's Material Editor, what is the difference between 'Masked' and 'Translucent' blend modes?

    Answer: Masked uses hard cutoff opacity while Translucent supports smooth semi-transparency

    Masked clips pixels at a threshold (binary), while Translucent allows partial transparency with smooth gradients but at higher rendering cost.

  5. Which Unreal Engine subsystem is responsible for managing the lifecycle of UObjects and preventing memory leaks?

    Answer: The Garbage Collector

    UE's Garbage Collector tracks all UObject references and destroys objects with no strong references, preventing memory leaks.

  6. What is a 'Level Streaming Volume' used for in Unreal Engine?

    Answer: Triggering the loading or unloading of streaming sub-levels based on player position

    Level Streaming Volumes are placed in the persistent level to automatically load/unload sub-levels when the player enters or exits the volume.

  7. In Unreal Engine's Chaos physics system, what is a 'Geometry Collection' primarily used for?

    Answer: Defining destructible meshes that can fracture at runtime

    A Geometry Collection is the asset type used with Chaos Destruction to define how a mesh fractures into pieces when force is applied.