What you're seeing
Reflections, complex collision, baked lighting, or a non-Nanite platform shows a coarser silhouette than the visible Nanite mesh.
Likely causes
- The affected system uses Nanite fallback geometry instead of the full-detail Nanite representation.
- Fallback Triangle Percent is too low or Fallback Relative Error removes important silhouette detail.
- The project needs a hand-authored fallback for a feature or platform.
Check in this order
- 01Toggle the Nanite fallback mesh and compare its silhouette with the full-detail asset.
- 02Confirm that the affected engine system is documented to use fallback geometry.
- 03Increase Fallback Triangle Percent or reduce Fallback Relative Error only as far as the use case needs.
- 04Provide and test a custom fallback LOD when automatic reduction cannot preserve the required shape.
Views and commands
Fallback visualization
Show > Nanite FallbackToggles the generated fallback representation in the Static Mesh Editor.
Fallback shortcut
Ctrl+NSwitches between the Nanite mesh and fallback mesh in the Static Mesh Editor.
Nanite A/B test
r.Nanite 0Disables Nanite so the fallback rendering path can be compared.
Static Mesh settings
Nanite Settings > Fallback Triangle Percent / Fallback Relative ErrorControls how much detail the generated fallback mesh retains.