Unreal Engine Issues

Level Instance desaturation effect does not respect occlusion when the selected object is occluded by a Nanite mesh

When selecting an asset in a level instance that is being edited via LevelInstance/Edit, the silhouette of the object is visible through occluding nanite meshes. This has the effect of disabling th ...

Crash in NaniteStreamManager when Nanite data fails to decode corrupt data from DDC

If Nanite data becomes corrupt in the DDC, the Editor may crash in FStreamingManager::InstallReadyPages() when the Pending.State is FPendingPage::EState::DDC_Ready but the resulting SrcPtr is null b ...

Nanite can assert in ValidateFixupChunk: 'Assertion failed: HierarchyNodeIndex < Resources.NumHierarchyNodes'

Reported by a licensee. More discussion in the linked UDN case. "Sometimes the WorldPartitionBuilderCommandlet will fail after encountering this error:" Error: Assertion failed: HierarchyNodeIndex ...

Nanite meshes are lit differently in Actor Colorization view modes than non-Nanite meshes

When the Lit > Actor Coloration > Affects Navmesh or other Actor Coloration mode is used, Nanite meshes apply lighting differently than non-Nanite meshes which can make it difficult to use the Actor ...

Material base color is lighter on Nanite meshes when using 16-bit GBuffer

The base color is brighter on Nanite meshes than non-Nanite meshes when GBuffer Format is set to "Force 16-bits per channel" (r.GBufferFormat 5) even though the meshes are using the same material. ...

Nanite mesh polygons disappearing when using masked opacity with vertex color in 5.4

In 5.4.3, a nanite enabled mesh with a material that takes its vertex color (R) and uses it as the opacity mask output in a masked blend mode material, causes the mesh to have disappearing polygons ...

Integer overflow in NaniteBuilder can lead to an editor crash on certain meshes

NaniteBuilder uses an int8 type for ExternalEdges and counts adjacency with a int32. The bug stems for the cast to int8 when adding the adjacency count into the ExternalEdges array. The precision l ...

Nanite compute materials don't work with VolumetricLightmap

RVT Tiles Update Slowly When Enabling Nanite Tessellation On Landscapes

Masked materials on Nanite meshes with multiple material slots causes erroneous cluster culling

When a nanite-enabled mesh with multiple material slots has a masked material applied, nanite may erroneously cull clusters that are still visible. ...