Unreal Engine Issues

Area Lights casting Specular regardless of material specular value

The rectangle lights ignore the specular value of lit materials and will apply a specular highlight to them regardless of the value. you can compare the result against a standard point light and you ...

Crash in PackagedBuild when using GPU & Data Interfaces

Due to module initialization order we are serializing shaders before the Niagara module has started up.  This means we are unable to find the default data interface for the GPU simulation to seriali ...

Networking Insights not correctly tracking outgoing multicast RPCs from server

It looks like this only happens to multicast RPCs that are outgoing from a server. Client RPCs still show up as expected, and both incoming and outgoing RPCs appear properly in a client's session. ...

Solidworks exporter does not support scale, scene orientation is different from CAD import and materials are missing

Notice that the udatasmith geometry does not have the scale : all volumes are identicalNotice that the udatatsmith scene is rotated of 90 degree compare to the CAD sceneNotice udatasmith does not have ...

In-Editor Tutorials are unresponsive when selecting them

@triage need approval to submit this into 4.27.2 When trying to select any of the tutorials in the editor, all of them except for the "Welcome to the Unreal Editor" tutorial are unresponsive. They ...

REINST classes are available in the class reference drop down

This doesn't seem to occur every time I run the editor, I can't get it to repro consistently Note: It is possible that this is happening in blueprints based off of a native c++ class has been rel ...

There's no motion blur on streaming GeometryCache

UDN customer mentioned: "there looks to be support for motion vectors as exported from DCC apps (for rare cases like fluid sim), but regular in-engine motion vector calculation for regular motion bl ...

Groom + RT refraction not working correctly

Implied Decal Blend Modes don't account for static ignore-switch parameters in an expected way

The desired behavior from a user perspective here is that they'd be able to use Static Switches in a decal master material to toggle different features and behaviors. In the above setup, if I set th ...

Implied Decal Blend Modes don't properly account for Material Attributes usage

I've attached a project with the necessary materials that demonstrate this issue. I would expect that just because a Set Material Attributes node is inside a material graph it wouldn't affect the de ...