Unreal Engine Issues

Scrubbing material roughness value in MI causes large frame drops

TArrayView64 RangeCheck prints the incorrect error messages for values over 32-bit length

TArrayView64 RangeCheck prints the incorrect error messages for values over 32 bit. Repro Rate: 4/4 Tested this in //UE4/Release-4.27 @ CL#18319896 and the issue did occur there, it is not a regre ...

Material slot assignment incorrect after mesh reduction completely removes all triangles from a section

When mesh reduction results in a section becoming empty, the material slots are incorrectly assigned. e.g. if section 0 gets removed due to it having no triangles after reduction, then its material ...

TArray64 RangeCheck prints the incorrect error messages for values over 32-bit length

TArray64 RangeCheck prints the incorrect error messages for values over 32 bit. Repro Rate: 4/4 Tested this in //UE4/Release-4.27 @ CL#18319896 and the issue did occur there, it is not a regressi ...

Moving a water body causes engine to drop fps and spike ms

Moving a water body lowers performance on the engine. The fps drop from 120 to 30 and ms spike from 8 to 30. This issue occurs in 5.0 Binary and 4.27 Binary on Windows. On Mac, FPS drop and ms spike ...

Merging static mesh actors results in static mesh sockets getting lost

Licensee reports that merging two static meshes results in any sockets disappearing in the resultant merged mesh. "essentially I want to "hard code" the materials and sockets to the static meshes s ...

Foliage Instance Static Meshes do not affect the Navmesh

Foliage Instance Static Meshes do not affect the Navmesh. I tried changing the Custom Navigable Geometry to 'Yes' & 'Even if Not Collidable' but got the same results. Repro Rate: 4/4 Tested this i ...

Movie Render Queue Renders Black Frames when MultiSample Effects Are Disabled

Occurs 5/5 times. When 'Disable Multisampling Effect' is enabled, the Render Warm Up is set to 0, and the Custom Playback Range is set to a small value, frames render out fully black. Regression d ...

Sequencer Frames Render Black When Four or Less Frames Are Rendered

Occurs: 5/5 times **MRQ renders black frames when custom playback range is set to four frames or less. Regression does not occur: tested using //UE4/Release-4.27 @ CL 18429761 GH Note: Issue does ...

Distance Cull Fade Node on Material does not work with Skeletal Mesh

The licensee reports that this issue is caused by the following code not performing a Buffer update. .\Engine\Source\Runtime\Renderer\Private\ShaderBaseClasses.cpp void FMeshMaterialShaderElementD ...