[CrashReport] Assertion failed: !Export.ClassIndex.IsNull() | UPackage::Save()

UE - Foundation - Core - Cooker - Sep 20, 2017

This is a somewhat common crash coming out of the 4.17 release. User Descriptionsclicked Launch->Firefox. This is the same project with in-game video-screens which has been crashing on Launch for W ...

Unable to locally rotate individual foliage

UE - LD & Art - World Building - Foliage - Jul 14, 2017

Unable to locally rotate individual foliage. This seems to have been a limitation of the foliage tool from it's creation. Licensee Description: I would like to ask if there is any way how to preve ...

Playrate / slomo causes motion blur length to change incorrectly

UE - Rendering - Jun 16, 2017

Discuss with the team what the actual desired behavior should be and adjust this calculation. This one is meant to stabilize the motion blur when we have a variable delta time but may be having kn ...

Investigate possible HISMC culling mismatch between tree, vertex and pixel shader

UE - LD & Art - World Building - Foliage - Jun 12, 2017

User reports that some foliage/grass instances that are completely culled are actually still being rendered, costing rendering time. Have a look using Intel GPA or RenderDoc and check pixel shader ...

iOS Shipping Build using std::thread crashes on launch

UE - Platform - Mobile - Jun 2, 2017

A user is reporting that using the following code in a GameMode class causes shipping iOS packages to crash on launch:void ANOGSSDKGameModeBase::StartPlay() { std::thread([](){ std::clog << "THRE ...

FBatchedElements::Draw - OrthoZoomFactor can be reset to 1.0f if Line.bScreenSpace is ever false

UE - Rendering - Feb 20, 2017

A licensee has reported that the Draw function in BatchedElements.cpp can set the OrthoZoomFactor (not a local variable) to 1.0f if Line.bScreenSpace is ever found to be false. The line this can oc ...

PDI-DrawPoint - Zoomfactor being calculated incorrectly

UE - Rendering - Feb 20, 2017

A licensee has reported that the ZoomFactor variable inside of the DrawPoint function is being calculated incorrectly. It currently is calculated using the lesser of the projection matrix's horizont ...

Point and Spot lights no longer work in Orthographic Projection Mode

UE - Rendering - Dec 30, 2016

Point and Spot Lights no longer work when using the Orthographic Camera Projection Mode. Note that the Directional Light still works as intended. This is a regression from behavior that worked in ...

Landscape Collision Offset with Visibility Mask

UE - LD & Art - Modeling Tools - Landscape - Oct 12, 2016

Landscape Collision is offset when using the Landscape Visibility Mask. If you paint a hole within the landscape and use the Third Person Template character to walk over the holes, the character wil ...

Threading bug in scene capture component

UE - Virtual Production - Sep 14, 2016

void USceneCaptureComponent2D::CaptureSceneDeferred() { UWorld* World = GetWorld(); if (World && World->Scene && IsVisible()) { // Defer until after updates finish // Needs some CS because ...