Unreal Engine Issues

[Feature Request] Single Layer Water shader doesn't accept Realtime Raytracing Shadows

This might be feature request? ...

Crash when adding Rectangle Lights to a game with multiple players while Raytracing is enabled

A user reported this issue to us through Salesforce. They initially said it crashed with both Spot Lights and Rectangle Lights, but I was only able to repro with Rectangle lights. Additionally, I di ...

Crash occurs when RayTracing.ExcludeDecals is enabled

The cause of the crash is out-of-range access to the array. ExcludeDecals eliminates the mesh instance to which the decal material is assigned, but it seems that the MeshCommand has been registered ...

The Radial Blur Shader Doesn't Look Correct With Raytracing Translucency Enabled

The Radial Blur shader doesn't look correct with ray tracing translucency enabled. Found in 4.24.1 CL#10757647 Reproduced in 4.25 Main CL#11050671 ...

If you use a transparent Material for one of the multiple materials, it will always show up in the raytraced reflection.

Raytraced translucency makes ExpHeightFog black

Does not occur in path tracing nor rasterized translucency. ...

Spline mesh can not cast shadow when raytracing enabled.

Nanite Skeletal Mesh uses incorrect LOD for raytracing

LOD0 for some Nanite Skeletal meshes is used for ray tracing scenes on some platforms  because some FSkinnedSceneProxy are incorrectly considered "always visible" ...

Crash using D3D raytracing with Support Ray Tracing unchecked static mesh

Static mesh that does not have Support Ray Tracing flag does not have a GeometryRHI object. So it causes a crash in FD3D12RayTracingScene. Excluding instances that do not have a GerometyRHI in FDef ...

Compilation error when using Particle SubUV in Niagara Mesh Particles with Raytracing enabled.

The licensee has shared the following workaround for modifying NiagaraMeshVertexFactory.ush. struct FVertexFactoryInterpolantsVSToPS { TANGENTTOWORLD_INTERPOLATOR_BLOCK #if USE_PARTICLE_SUBU ...