Unreal Engine Issues

Dithered LOD transitions sometimes briefly flicker to the next LOD before fading

When dithered LOD transitions occur, a brief flash of the next LOD level is first shown on the entire mesh after which the current LOD fades to the next (or previous) LOD. The flashing behavior only ...

World Origin Shifting Rendering Desync On Play

Warning in Net.PacketNotify Test

Warning when running the packet notify test, regarding missed acks. ...

Incorrect collision of merged actor that was merged from a Spline Mesh Component

Incorrect collision of merged actor that was merged from a Spline Mesh Component Licensee description: We often use spline mesh blueprints to generate organic art for us, like roots, trees, and r ...

Popping Ribbon UVs

Please see the Additional Link for related UDN information. The UV popping described can be subtle, depending on settings; it's affected by spawn rate and GPU vs CPU. The popping shown in the gif t ...

Engine Crashes When Previewing ES3_1 With Material Using World Position Offset (Need Custom Stencil)

This crash will only occur when this criteria is met.You have enabled custom depth with stencils in the project settingsA mesh in the scene is rendering to custom depth with a stencil value of 1The ...

Doing a Rebuild in Visual Studio fails to compile

Attempting to use the Rebuild option in Visual Studio will fail to build the project. It instead produces a message that "Epic was unexpected". ...

Blueprint Actor with instance editable variables that are named with brackets cannot have their default values duplicated

When copying a Blueprint actor, Variables with brackets in their names don't have their values copied. IE: Creating a vector variable named "MyVector[]" This behavior also replicates with round brac ...

Actor attached to other actor in LevelInstance has very large bounds

Attached actors do not return to LevelInstance space at the end of LevelInstance editing, and bounds contains level instance offset location. This results in huge bounds. My workaround is:  void FL ...

Refraction not calculated when using Material Property Overrides Blend Mode

Found in the process of replicating the linked Answerhub. When an opaque material is setup as a master material with the intent to have an Opaque and Translucent version, the material instance will ...