Collision issues in Unreal Engine can stem from a variety of sources, including:
To resolve collision issues in Unreal Engine, follow these steps:
Check Collision Presets: Verify that the collision presets are appropriate for the object's role in the game, such as 'BlockAll', 'OverlapAll', etc.
Inspect Collision Mesh: Ensure the object has a proper collision mesh. Use simple collision shapes where possible for performance reasons. Check the collision complexity and consider using "Use Complex Collision As Simple" if necessary.
Review Physics Asset: For skeletal meshes, open the Physics Asset Tool (PhAT) and make sure all bones that require collision have collision bodies attached and properly configured.
Enable Overlap Events: If overlaps are not triggering, ensure that 'Generate Overlap Events' is enabled in the object's collision settings.
Normalize Scale: Make sure the object doesn't have non-uniform scaling applied, as this can affect collision detection. Aim for uniform scaling factors.
Configure Layers/Channels: Go to Project Settings -> Collision to ensure that the collision channels are set up correctly so that the objects are interacting with the intended channels.
Adjust Movable/Static Setting: Change the object's mobility settings to 'Movable' if it needs to react to physics, or adjust other objects accordingly if there's a mismatch.
Global Settings: Look into the World Settings and ensure that the global collision settings match your expectations for the scene.
Rebuild Physics Data: In the case of persistent collision issues, try rebuilding the physics data within the engine.
Debugging Tools: Utilize the collision visualization tools (e.g.,
Show Collision) and the log outputs during gameplay to diagnose what's happening when collisions occur or fail to occur.
By carefully reviewing each of these areas, you should be able to identify and fix the collision issues in your Unreal Engine project.