Unreal Engine Issues

Velocity Scene Texture Data Integrity Issues

When a Post-Process Material uses the Scene Texture Material Expression, the following code is generated: ``` MaterialFloat2 Local0 = Parameters.TexCoords[0].xy; MaterialFloat2 Local1 = ClampSceneT ...

Out-of-Bounds Access During Partial Updates of ISMC Per-Instance Custom Data

When using instance custom data values, removing an instance and changing the number of custom data floats in sequence can cause an array-out-of-bounds crash. The underlying arrays are not resized ...

WorldToClip/ClipToWorld transform in materials not behaving as expected

In 5.3, the specified code will return all 0 or very small as expected. However in 5.4.4 and onwards (also checked in 5.6.1 & 5.7.1), it returns very large numbers. ...

Groom assets can no longer be created without curves data

It used to be possible to create an empty Groom assets without an Alembic file. However, this is no longer possible because curve data is required This workflow is useful to create grooms that onl ...

LWCLength precision issues

Large World Coordinates tile-offset position data can result in artifacts far from the world origin, when using it as input for mathematical distance field generation. This can be mitigated by demot ...

Lightmass CalculatePointShadowing regression in UE5.6

There is a regression or change in the Build Lighting process when using Lightmass in Unreal Engine 5.6:When building lighting with Lightmass calling the CalculatePointShadowing function, the result ...

Race condition in skin cache task wait and GetCachedGeometry

Downsampled SceneColour textures are not invalidated after ComposeToNewSceneColor when TSR is enabled leading to AfterMotionBlur materials not rendering bloom

When an emissive AfterMotionBlur material is used with TSR, Bloom is not applied to the material. The cause for this appears to be that AfterMotionBlur materials are composed to a separate texture ...

Volumetric lightmap cache point becomes extreme bright if the light source is accidently at the exact(or almost) location of it

Rect Light not rendered correctly when using Virtual Texture as source texture

Licensees have reported that this issue occurs when rendering from the command line: Rectangular lights with virtual textures do not render when you run the "Render (Remote)" button in the Editor, a ...