Inu Games - Modular Snap System Runtime

[scha (scha (inu games))]

@Entilzar

Ok, I now use GetAttachedActors in a recursive function to get children of children, and it’s cleaner.

However, one big bug remains : when I apply scale to my 3-cube bar (composed of Cube1, Cube2 and Cube3), sometimes (difficult to know when that happens), Collisions on the Static Meshes of the snapped Actors I’ve just rescaled are completely messed up.
If I use the console to Show Collision, all is displayed as expected, but when I try to Grab one of the snapped Actors (say Cube 2), either no Collision is detected by GetActorNearHand, or if a Collision is indeed detected, the actor and component returned are from one of the others snapped actors (Cube 1 or Cube 3), not the one I try to Grab. When this occurs, if I try to Detach one of the snapped Actors I can Grab, I may get a Warning concerning the Actor I cannot Grab : “try so Simulate Physics but No Rigid Body”.

So visually all seems correct, but “physically” objects are not where they seems to be.
It’s a problem because I cannot scale them again, and snapping and physics do not work properly with the “ghost” actors.

I don’t know whether this is a UE4 or a MSSR issue, but maybe you have already experimented that kind of bug.

Yes, I know that bug. UE4 is not very robust when attaching and detaching physics actors, it’s pretty easy to have this problem.
In my experience there are 2 things which will cause the bug:
It can occur if the “auto weld” parameter in sm actor physics properties is disabled, so make sure it’s checked.
And another way to have it is to detach/attach physics actors when their physics are temporarily disabled. So check if actors are simulating physics before attaching/detaching them.