Lightmaps cannot be created correctly when copying Blueprint that has Static Light as Child Actor component on the level

Rendering - Ray Tracing - Jul 31, 2020

In this project, BP with Spot Light registered as Child Actor is placed. If we copy and build, the following warning will be displayed. BP_Spotlight_GEN_VARIABLE_BP_Spotlight_C_CAT_330 'BP_Spotlig ...

"REFLECTION CAPTURES NEED TO BE REBUILT" is displayed on a cooked game.

Rendering - Ray Tracing - Jul 29, 2020

This issue occurs when streaming levels including reflection captures are displayed with  delay. When it finishes loading assets, reflection capture textures are uploaded to the GPU. Then the leve ...

UE4Editor is crashing after user builds lighting

Rendering - Ray Tracing - Jul 22, 2020

Issue reported by user that they are experiencing consistent crashes in UE4Editor have building lighting. ...

Weird reflection pixels of translucent objects with Ray Tracing Reflection

Rendering - Ray Tracing - Jul 15, 2020

[Image Removed] ...

Lightmass: Blocky lightmap artifacts appears on the Mesh Actor which is shadowing by a single face mesh

Rendering - Ray Tracing - Jun 9, 2020

Begin Map Begin Level Begin Actor Class=/Script/Engine.StaticMeshActor Name=Plane_2 Archetype=/Script/Engine.StaticMeshActor'/Script/Engine.Default__StaticMeshActor' Begin Object Class=/Script/En ...

[Groom] Very thin hair has incorrect raytraced shadow on edges

Rendering - Ray Tracing - Jun 8, 2020

This only happens when 1) Hair Width is very small. e.g. 0.01 in the example 2) Light has raytraced shadow and Samples Per Pixel has a value > 1. e.g. 8 in the example The problem seems to be rel ...

Niagara Mesh Renderer's ParticleColor is not reflected in raytraced reflections

Rendering - Ray Tracing - Jun 2, 2020

Mesh's ParticleColor is not reflected in raytraced reflections Sprite Particles do not encounter this issue.  ...

On PC and Mobile Preview, Volumetric Lightmap provide very different Indirect lighting direction

Rendering - Ray Tracing - May 18, 2020

Expectation: It's known it has different lighting interpolations method and quality for VLM on PCvsMobile; but Indirect lighting from VLM should provide similar lighting Direction on PC&Mobile. ...

When enabling virtual texture lightmaps it looks different viewing

Rendering - Ray Tracing - May 15, 2020

After switching the Virtual texture lightmap on/off, it looks different. It looks like there is a difference in the light map because there are some missing shadows (see attached screenshots). ...

Switching raytracing console variable in runtime can crash engine.

Rendering - Ray Tracing - May 13, 2020

Licensee reported that is caused by missing ECVF_RenderThreadSafe flag in these console variable definitions. r.RayTracing.Shadows r.RayTracing.AmbientOcclusion r.RayTracing.Reflections Here is a ...