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IgnoredActors are ignored in ActorLineTraceSingle method call

I am on UE4.5 and following is my scenario.

  • I have an Actor(A1) with a collision component and custom collision profile.

  • A1 fires another actor (A2) with a collision component and custom collision profile.

  • A2 starts moving towards an object (thin Wire (W)) of type WorldStatic. Here is the problem, since A2 moves quite fast, sometime it skips the collision with W and pass through it. In order to avoid this tunnelling problem I was trying to use ray tracing by calling ActorLineSingleTrace on A2. The call seems to be working but it hits either A1 or A2 which is not the desired result. In the meantime I have the overlap behaviour setup for A2 and W and it works only 50% of the time.

I added A1 and A2 to IgnoredActors list inside FCollisionQueryParams but if I debug deep in ActorLineTraceSingle I see that IgnoredActors parameter is not used at all. Am I missing something?

Any help is appreciated!!

Here is my code:

     FHitResult hitResult;
     GetWorld()->DebugDrawTraceTag = "BulletTrace";
     FCollisionQueryParams collisionParams;
     TArray<AActor*> ignoredActors;
     AActor* source = const_cast<AActor*>(Cast<AActor>(GetSource()));
     collisionParams.TraceTag = "BulletTrace";
     if(ActorLineTraceSingle(hitResult, currentLocation, futureLocation, ECC_WorldStatic, collisionParams))
         //Take appropriate action

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asked Nov 23 '14 at 07:04 PM in C++ Programming

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I kept digging into this and found a solution :)

Instead of using ActorLineTraceSingle I am using GetWorld()->LineTraceSingle() which actually does respect the IgnoredActors list passed to the FCollisionQueryParams.

I also setup a new trace channel for this purpose.

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answered Nov 25 '14 at 01:41 AM

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