Unreal Engine Issues
Unreal Engine Issues
TMap property on AnimNode causes memory corruption
OLD - Anim - Jan 10, 2020FastPath can't handle TMap (maybe any other container type too) in AnimGraph causes this crash. FastPath copies TMap property to the AnimNode member property directly like MemCopy. So two properties ...
Modifying FSuggestProjectileVelocityParameters::ResponseParam.CollisionResponse modifies FCollisionResponseParams::DefaultResponseParam
UE - Gameplay - Sep 17, 2024FSuggestProjectileVelocityParameters was introduced in 5.4 and has a FCollisionResponseParams member that's initialized as a mutable reference to FCollisionResponseParams::DefaultResponseParam. str ...
Unable to define custom raw input defice configurations
UE - Gameplay - Input - Feb 21, 2017The FRawInputDeviceConfiguration struct is not exposed so attempting to define custom raw input device configs fails with unresolved external errors when using: FRawInputDeviceConfiguration newConfi ...
TMap Contains Node Returns False Incorrectly Under Specific Circumstances
Tools - Nov 20, 2019The Contains node doesn't return an existing row from a data table under specific circumstances. This didn't occur when the struct the data table is based on was made via blueprints or there are mor ...
Plugin fails to compile in 4.11 due to redefinition errors
UE - Foundation - Cpp Tools - Plugin System - May 10, 2016Plugin fails compile in 4.11 / 4.12 due to redefinition of class/struct type (locally). AH user reported LNK2005 error when compiling in 4.11 Regression: YES? - Project with the attached plugin co ...
FDateTime instances are reset to default on hot reload
UE - Gameplay - Blueprint - May 31, 2017If an FDateTime variable is created in code and has a default value set in blueprints, any instance that is set to the blueprint default value changes to the code default on hot reload. This includ ...
Rare assertion comes up when cooking if sequencer camera track has only additive transform track
UE - Anim - Sequencer - Mar 2, 2020If a camera track has only additive transform track, some functions return uninitialized F3DTransformTrackToken made by default constructor. It causes a rare assertion. Please take a look at F3DTra ...
Crash when splitting a UDS pin on a collapsed graph
UE - Gameplay - Blueprint - Jan 27, 2017I came across this bug while attempting to verify UE-41073. That bug is verified, but I accidentally added the struct into the collapsed node without going into the collapsed graph and split the col ...
Instanced static mesh component PerInstanceSMData array defaults do not propagate from the owning Actor CDO to instances on edit.
UE - Gameplay - Blueprint - Nov 19, 2016This occurs because the 'LightmapUVBias' and 'ShadowmapUVBias' struct fields (deprecated) are initialized in UInstancedStaticMeshComponent::SetupNewInstanceData() to nonzero vectors, but as these pr ...
FSkeletalMeshComponentInstanceData subclasses FSceneComponentInstanceData instead of FPrimitiveComponentInstanceData
UE - Anim - Rigging - Mar 19, 2025FSkeletalMeshComponentInstanceData subclasses FSceneComponentInstanceData instead of FPrimitiveComponentInstanceData. When calling ApplyToComponent() the SceneComponentInstanceData version will be c ...