Ray Traced Ambient Occlusion Uses Resources Even if AO Intensity is 0

Rendering - Ray Tracing - Aug 22, 2019

Ray traced Ambient Occlusion is still active even when Ambient Occlusion Intensity is set to 0 in the Post Process Volume. Found in 4.22 CL# 7053642, 4.23 CL# 8115738, 4.24 CL# 8124506 ...

Ray Traced Translucency Option Doesn't Function in Post Process Volume

Rendering - Ray Tracing - Aug 16, 2019

Ray Traced Translucency Option Doesn't Work in Post Process Volume. Found in 4.23 Preview 6 CL# 7848402, and 4.24 CL# 8074192 Working as expected in 4.22 CL# 7053642 This is a regression. ...

Severe ghosting on animated objects when camera stops moving in sequences when using path tracer

Rendering - Ray Tracing - Aug 2, 2019

Pixels seem to stop updating in the path tracer when a camera stops moving in sequence. Old color values from objects that have moved seem to still affect pixels they should not.  ...

SpiralBlur-SceneTexture Does Not Compile If Raytracing Enabled

Rendering - Ray Tracing - Jul 22, 2019

The material function SpiralBlur-SceneTexture, does not compile in DX12 mode. Found in 4.22 CL# 7053642, 4.23 CL# 7321677, 4.24 CL #7474192 ...

Editor Crashes when Isolating a Material Element on Skeletal Meshes with Ray Tracing Enabled

Rendering - Ray Tracing - Jul 3, 2019

With ray tracing turned on, clicking on the isolate material option next to a material slot on a skeletal mesh with more than one material slot, causes the editor to crash. Found in 4.22 CL# 7053647 ...

lots of wasted Volumetric lightmap samples

Rendering - Ray Tracing - Jun 20, 2019

Expectations: The samples should only surround the lightmass importance volumes.  Imagine if we build a 8K*8K map with lightmap importance volume at the corners of the map, even using stream levels ...

Random Scene Objects are not being rendered in Raytraced Reflections in packaging builds.

Rendering - Ray Tracing - Jun 11, 2019

Each time the build is run, different assets are missing in the reflections. Found in 4.22 CL# 6574378 and 4.23 CL# 6925347 ...

Ray Traced Reflections Get Darker The Higher The Rougness Value is for Metallic Materials

Rendering - Ray Tracing - Jun 11, 2019

Instead of reflecting an average color of the surrounding, reflections become black with increased roughness values. Found in 4.22 CL# 6574378 and 4.23 CL# 6925347 ...

Crash on RTX Laptop with ray tracing and -d3ddebug

Rendering - Ray Tracing - May 1, 2019

Editor is crashing with d3ddebug in ray tracing Does not occur in dx12 without ray tracing Does not occur on a desktop PC with a 2080 Does not occur without d3ddebug ...