Summary
Nanite has automatic removes a valid edge from Hex Sphere(Ico-sphere with Subdivision 3), causing twisted geometry at the bottom of the mesh.
Temporary fix:
Disable Nanite on the mesh.
What Type of Bug are you experiencing?
Other
Steps to Reproduce
Reproduction Steps:
Blender
Create a new mesh:
Add → Mesh → Icosphere
Radius = 0.5
Subdivisions = 3
Add a Geometry Nodes modifier.
Create a new Geometry Node graph.
Add a Dual Mesh node.
Connect:
Group Input
↓
Dual Mesh
↓
Group Output
Apply the Geometry Nodes modifier.
Export as FBX.
Unreal Engine
Import the FBX as a Static Mesh.
Enable Nanite.
Place the mesh in the level.
Create a simple Additive Material.
Apply the material to the mesh.
Rotate the sphere to inspect the bottom.
Expected Result
All polygon edges should be preserved.
No twisted or malformed faces should appear.
Observed Result
Nanite removes one internal edge on a polygon near the bottom of the sphere.
As a result:
the polygon is triangulated differently,
the face becomes twisted,
visible rendering artifacts appear at the bottom of the sphere.
Affects Versions
5.8
Platform(s)
Windows
