Unreal Engine Issues

The vertex color becomes red when importing a static mesh without Color Set

It seemed to be white at 4.19, but it seems to be red at 4.20. I found out that there seems to be a cause for initialization of Mesh Attributes. As a result of fixing this, it is now displayed in wh ...

Shift + Leftclick selection not working in World Outliner

The Shift + Leftclick selection range appears to break when selecting something in the World Outliner first followed by clicking something in the Viewport and then shift selecting a range back in th ...

Unimplemented Simplygon function causes empty mesh LODs and crashes

When we do the refactor for MeshDescription we miss the staticmesh reduction project settings option and change only the quadric reduction. There are two possible fixes for this issue: 1. Implemen ...

[ Rhino ] Rhino 6 files are not importing correctly in DataSmith

Geometry from a Rhino 6 file is not importing correctly. When imported it has holes and tears in the mesh. The same file saved as Rhino 5 and imported looks fine. ...

Selecting with eyedropper tool will select ChildActor

It can select ChildActor with the Eyedropper tool. Since ChildActor is an actor created temporarily, when you restart the Editor it becomes empty because there is no reference. When selecting AActor ...

Blueprints with accent characters fail to open when converted from 4.19 to 4.20

Any Blueprint with accents in the name, coming from 4.19 won't open in 4.20. Double clicking the asset, trying to right click asset, results in no actions. When loading the project this message app ...

Mesh merge instancing can swap material ID

Race condition whilst cooking material layers: Invalid DDC key

When cooking the DDC key for a material layers parameter set may become invalid which causes issues reading/writing to the global material shader map and can lead to a crash. See original UDN post f ...

Datasmith Importer stalls Editor when importing large Rhino files

Importing large Rhino files will cause the Editor to stall during the import process for a long time. When testing the attached file the Editor stalled close to an hour with no results. The attached ...

Rhino blocks not placed correctly when imported

The Rhino blocks are imported with the base point at the origin, causing them to import inside of each other when the process is complete. In 4.20 (4.20E4) the blocks are imported apart from each ot ...