Summary
Our engineering and art teams are currently doing heavy optimization passes on our projects. Our goal is to minimize memory footprint and reduce overhead by stripping unnecessary collision, interaction, and physics logic from decorative Fortnite props. However, we are encountering a workflow blocker: UEFN is silently reverting specific property overrides back to their default states on certain Fortnite assets.
The Issue: We are systematically disabling some settings related with physics, weak spots, and interactions on specific instances to save performance. After saving and continuing development, we notice that the engine forces these modified assets back to their default configurations. This does not happen to every single asset, but it is widespread enough to make our optimization efforts unpredictable and untrustworthy. Specific properties being reverted: Based on our audits, the platform is overriding our custom checks on the following component settings:
• Collision Settings: Collision Presets resetting from NoCollision or FortStaticMesh back to defaults.
• Physics & Bounce: Play Bounce and Propagate Bounce Effects being re-enabled.
• Structural Support & Weak Spots: Register with Structural Grid and Forcibly Structurally Supported being re-enabled. Allow Weak Spots and Use Complex for Weak Spots checking back on.
• Interaction & Damage: Allow Interact and Show First Interact Prompt being re-enabled. Allow Team Damage
Our questions: Is this intended behavior? Are there hardcoded protections on certain Fortnite assets that prevent developers from permanently overriding these specific values? Is there a recommended workflow? If directly editing these instance properties is prone to being overwritten by platform updates or engine validation, what is the correct Epic-approved method for bulk-optimizing these specific actor traits? Is this a known bug being tracked? Thank you very much
Please select what you are reporting on:
Unreal Editor for Fortnite
What Type of Bug are you experiencing?
Assets
Steps to Reproduce
Set these settings in a specific Fortnite asset, and check how the settings go back to the originals.
Collision Settings: Collision Presets resetting from NoCollision or FortStaticMesh back to defaults.
• Physics & Bounce: Play Bounce and Propagate Bounce Effects being re-enabled.
• Structural Support & Weak Spots: Register with Structural Grid and Forcibly Structurally Supported being re-enabled. Allow Weak Spots and Use Complex for Weak Spots checking back on.
• Interaction & Damage: Allow Interact and Show First Interact Prompt being re-enabled. Allow Team Damage
Expected Result
The checks should remain as we intended, modified based on the best performance settings for our project.
Observed Result
The settings go back to the previous default stage.
Platform(s)
It is visible in Editor, but it is reflected in the performance in every platform, having more impact in PS4 and XBOX one
Additional Notes
We are trying to improve the verall performance of the island, and we have been doing varius optimization efforts, including the adjustments of these settings. We have been doing this with a wide amount of assets, and this does not happen to every single asset, but it is widespread enough to make our optimization efforts unpredictable and untrustworthy.