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Beam particule twitching when moving the mous


So I made a lot of lines with the particle system. I set in c++ the target and source which works fine but the lines are twitching only when I move the mouse. I also would like to put the lines behind the nodes but they don't stay behind. alt text

C++ code to add the beam and set the target/src :

 FVector src = FVector(currentNode->GetActorLocation().X, currentNode->GetActorLocation().Y, currentNode->GetActorLocation().Z);
                     FVector dst = FVector(rightLink->GetActorLocation().X, rightLink->GetActorLocation().Y, rightLink->GetActorLocation().Z);
                     UParticleSystem* sys = currentNode->linkSystem;
                     UParticleSystemComponent* link = UGameplayStatics::SpawnEmitterAtLocation(World, sys, FTransform(src),0);
                     link->SetBeamSourcePoint(0, src, 0);
                     link->SetBeamTargetPoint(0, dst, 0);

Product Version: UE 4.21
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asked Jan 19 '19 at 06:17 PM in C++ Programming

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