Basically I want to be able to set different collision masks for different objects during runtime. In my current example/prototype I am trying to make 4 of my 8 boxes collide with each other (and BSPs) while these 4 do not collide with the other 4 boxes, and vice versa.
Is this possible? It is important that I can change the layer masks during runtime.
In Unity this would be physics layer masks.
Unreal Engine has collision filtering under Project Settings → Engine - Collision
It should work more or less the same way.
The problem is to do this during runtime.
I found something that may work but there is very little to go on at this point. I’m hoping others may take this lead and figure out how to use it. I found these functions in “PrimitiveComponent.h”.
/** Set the mask filter we use when moving. */
void SetMoveIgnoreMask(FMaskFilter InMoveIgnoreMask);
/** Get the mask filter we use when moving. */
FMaskFilter GetMoveIgnoreMask() const { return MoveIgnoreMask; }
/** Set the mask filter checked when others move into us. */
void SetMaskFilterOnBodyInstance(FMaskFilter InMaskFilter) { BodyInstance.SetMaskFilter(InMaskFilter); }
/** Get the mask filter checked when others move into us. */
FMaskFilter GetMaskFilterOnBodyInstance(FMaskFilter InMaskFilter) const { return BodyInstance.GetMaskFilter(); }
There are also some functions that let you provide a list of actors to ignore.
/**
* Tells this component whether to ignore collision with all components of a specific Actor when this component is moved.
* Components on the other Actor may also need to be told to do the same when they move.
* Does not affect movement of this component when simulating physics.
*/
UFUNCTION(BlueprintCallable, Category = "Collision", meta=(Keywords="Move MoveIgnore"))
void IgnoreActorWhenMoving(AActor* Actor, bool bShouldIgnore);
And some others that let you do it on a component level. I need the mask method, personally.
I will update this answer if I figure it out. For now that’s the best I can do.
UPDATE:
I was able to use IgnoreActorWhenMoving(). It does what it says. If that’s enough for you then this is your answer already. I need to ignore a whole category of actors but I can’t use collision channels, so I’m moving on to ignoring by mask (whatever that is).