Line Trace by Channel not ignoring Actors to Ignore


so I got my Line Trace by Channel setup. It works perfectly but recently I bumped into a problem.

I need it Ignore the building which I place depending on where it hits while I place it.

Right now I tried adding it to the Actors to Ignore but it just isn’t ignoring the actor. When I remove the collision it does exactly what I want so it has to collide with itself and create a new point.

Here is a video to what I mean. The first time is with Collision enabled. The second one when it’s disabled. After it’s placed the collision get’s enabled anyway but my problem is this real time placement.

[Video Link][1]

And the picture of the Line Trace itself

I seriously run out of ideas at this point.
Any help is welcome!

I am having the same problem. I asked the same question in a separate post. Haven’t heard anything back so far. Kind of disappointing.

Did you manage to figure it out?

Hi all,

I haven’t been able to reproduce this issue with the LineTraceByChannel node. Would either of you be able to create a small test map with which you can recreate this problem, and uploading it somewhere I can get it? Thanks!


We haven’t heard back from you about this issue in a while, so I am marking this post as resolved for tracking purposes. Please feel free to reopen the post when you have more details or a test map for us to look at. Thanks!

The problem is still occurring, the line trace is still “hitting” the actor that I ordered to ignore… =/

Hi Filipe,

Can you provide a small test project that displays this problem? We have still been unable to reproduce the issue here. If you can, zip up a project and upload it somewhere such as Dropbox or Google Drive, and get me the download link. We can take a look from there. Thanks!

Hi Ben

Ok, it is simple: I have a fog BP, the same FOG one from the blueprint example, and the butterfly BP from the same blueprints example.

I just want the butterflies to ignore the fog, because they are landing on it, using “get all actors of class” and hooking it to the line trace of the butteflies Blueprint does no effect.

PS: I´m using the line trace for object, static ones, but the fog I still want to ignore it, hehe

Thank you so much for trying to help!

The BP_FogSheet? That doesn’t have any collision, so the line trace couldn’t possibly detect it. Can you put this into a small project and let me see this in action? Or give me specific steps to follow to reproduce this the way you did in the Blueprints project?