Unreal Engine Issues

Broken hair material with light function

Hair Materials do not react to Light Functions in the same way as other Materials. There is a visual difference between a Directional Light at 1 lux with no Light Function and a Directional Light at ...

CPU Particles do not Collide in Standalone or New Window Play Mode on Mac

When playing a game from a Standalone Game or New Window, CPU Particles will not keep their collision on a Mac. ...

Scene capture allocate internal render target

Allow promote to variable on Color structs/Vertex Colors structs for Procedural Mesh components

Issue: Currently, it is not possible to make a variable of type "Color" specifically for the color struct on procedural mesh components (see image attached). This is the only variable on procedura ...

Separate Translucency for Particles Breaks when Scene Color is used

When using Scene Color in a Particle System's Material with Separate Translucency checked true, all Particles with Separate Translucency checked true placed in the level with the Scene Color Particl ...

[CrashReport] AppleIntelBDWGraphicsGLDriver!USC::CPassSsaAllocatorContext::RollbackSpillFillToCopies()

Error message: SEGV_MAPERR at 0x3a Source Context: Most recent user affected CL: 3106830 (4.13.0) Logs: [Link Removed] [Link Removed] [Link Removed] CrashReporter User Descriptions:UE4.13 immed ...

Editor Crashes When a Component and Actor Implement Two Interfaces

The editor crashes if you implement two blueprint interfaces in an actor blueprint, and then an actor component blueprint. These interfaces must have at least one function that returns a value. The ...

Pick Parent Class window for new blueprints does not properly list available classes on Linux

When opening the Pick Parent Class window on Linux, the expansion arrow next to All Classes does not properly extend to show all classes. Workaround: After clicking the arrow to extend the drop dow ...

Long thin spinning objects take too long to stop spinning

See the SpinningObjectStability test map in the Physics Sandbox. [Link Removed] It's not clear if this is a bug or a side effect of some of our solver shortcuts (e.g., omission of the precession te ...

Blueprint actor reference breaks after hot reload

Reference to a blueprint based on a custom class will break if changes are made to the parent class and a hot reload is performed. Error Displayed added to Callstack section. Workaround: Compiling ...