Unreal Engine Issues

Lost triangles when creating convex collisions

Uncrouching a character on a physics object causes the character to penetrate the object only when physics substepping is enabled

This does not repro when physics substepping is disabled. The sequence of events in the character uncrouch code (UCharacterMovementComponent::UnCrouch) causes the capsule to move up then increase i ...

Engine Crashes On Scene Close When An Actor Is Spawned With Templated FActorSpawnParameters

When an actor is spawned with Spawn Parameters that are templated the engine crashes when closing a scene. This wasn't happening when there wasn't a physics constraint on the spawned blueprint. Thi ...

CollisionPreset of ComplexCollisionMesh is overrided by Drawing mesh settings

When setting ComplexCollisionMesh of StaticMesh asset, CollisionPreset that is actually applied becomes the setting on the drawing mesh side. It seems that ComplexCollisionMesh is not considered in ...

Niagara and Groom causes exception crash on Launch when using

Trying a Launch after every step shows that the problem occurs as soon as the GroomAssetSystem is added to Niagara. If the GroomAssetSystem is removed, the game launches fine (but the hair doesn't m ...

Crash when using ComplexCollisionMesh and the ComplexCollisionMesh has more material index than drawing mesh's material index

When using ComplexCollisionMesh of StaticMesh asset, at the time of hit, the physical material refers to the material of the drawing mesh side using the material index of the collision mesh side. T ...

The Gradient Paint Tool In Cloth Simulation Doesn't Work On Mac

The Gradient Tool rotates the camera on Mac instead of painting the Gradient End Value. I wasn't able to test in Main on a Mac. There were no issues on Windows in 4.23.1, 4.24.3 and 4.26 Main. Foun ...

Overlap Events Don't Work On ISM.

ISMs will generate Hit Events but not Overlap Events. ...

Physics Constraint Actor Won't Disable Collision Between Two Actors That Are Already Colliding

Meshes that are colliding that are set as constraint actors don't follow the Physics Constraint Actors "Disable Collision" parameter if they are colliding prior to being set as constrained actors. ...

Show collision can't display Complex Collision Mesh

"viewmode collisionpawn" and "viewmode collisionvis" can not display complex collision meshes as well. ...