DX12 crash by lost device while building PSO

Rendering - Sep 22, 2020

It seems to be occurred when exiting fullscreen exclusive mode during the PSO build. And it seems to happen during the loading screen as well as the PSO build. What I suspect is that when focus los ...

Creating a 64K texture triggers an out of memory crash

Rendering - Sep 21, 2020

When building very large textures (such as virtual textures) we allocate very large intermediate buffers for compression at full 4 channel float precision. For a 64K texture this can be 64GB in siz ...

Capture Source not changing in Planar Reflections

Rendering - Sep 14, 2020

Changing the Capture Source in Planar Reflections is not working as expected. Without being able to change the source, Post Process Materials are not rendering in the Reflection. Reported in versio ...

Packaged Paper2D game using Flipbooks crashes when opening Level

Rendering - Sep 11, 2020

Paper2D game using Blueprint Actor with Box Collision and Flipbook Component crashes frequently when loading levels in packaged Development Build. Reported and tested in versions 4.25.3(CL 139427 ...

Screen Space Reflections not showing in Panoramic Capture

Rendering - Sep 10, 2020

Reflections not showing in Panoramic Capture images. Reported and tested in versions 4.25.3(CL 13942748), 4.24.3(CL 11590370), and 4.23.1(CL 9631420).  ...

Specular reflections break when using Forward Shading

Rendering - Sep 3, 2020

Forward Shading under 4.25.3 seems to break something in the Hair shading model. Default Lit seems to behave normally. Reported and tested in 4.25.3(CL 13942748). ...

Lighting channels on static mesh doesn't change correctly at runtime

Rendering - Aug 28, 2020

If call SetLightingChannels in blueprint to set a static mesh's lighting channels at runtime, the mesh in the viewport seems can't update to the new lighting channel setting.  A weird thing is, if ...

Parameterized Vector4 is treated as Float3

Rendering - Aug 28, 2020

A Parameterized Vector4 are being treated as Float3. This prevents users from being able to use Vector4s in an If node during runtime. This is seen as far back as //UE4/Release4.22 cl 8065155 so th ...

Occlusion Culling incorrectly culling objects

Rendering - Aug 26, 2020

When playing in PIE/camera moving from left to right, pieces of the floor grid are culled out when they are not supposed to be. I was able to replicate this issue, however after I brought up the c ...

Editor crashes when calling "Begin Draw Canvas to Render Target" on Event Tick

Rendering - Aug 20, 2020

The recent hotfix caused this workflow to begin crashing. User reports that it worked as intended in 4.25.2 (CL-13908680). We are unable to reproduce it in 4.24.3 (CL-11590370) either. Crash is ha ...