Custom Collision Channel confusion

Development Programming & Scripting C++
1

Hello, I have something seemingly simple in my game but it’s giving me a ton of problems.

You can enter a spirit mode, where you can interest with other spirit objects.

This works perfectly fine for regular collisions, spirits interact with other spirits, but I can’t get it working in C++ traces, they seem to ignore these presets completely.

These two are auto-generated in my DefaultEngine.ini


+DefaultChannelResponses=(Channel=ECC_GameTraceChannel1,Name="Spirit",DefaultResponse=ECR_Block,bTraceType=False,bStaticObject=False)
+DefaultChannelResponses=(Channel=ECC_GameTraceChannel2,Name="Water",DefaultResponse=ECR_Ignore,bTraceType=False,bStaticObject=False)

But using ECC_GameTraceChannel1 never detects the spirit objects in game.
I thought it was tied to the Collision preset, but it looks ECC_GameTraceChannel1 is tied to the Spirit and Water object channels I added… If so, how can I get the proper collision presets?

I’ve looked all over online but can’t seem to figure this thing out. Any info would be greatly appreciated!
Thanks!

2

There are two different collision channels in UE4: trace channels and object channels. You have currently defined an object channel for Spirits, but haven’t defined a trace channel. If you go to Project Settings -> Collision, you will see an option to add a new trace channel. Once you add a new trace channel you should see a new entry in your DefaultEngine.ini.

It will probably look something like this:


+DefaultChannelResponses=(Channel=ECC_GameTraceChannel3,Name="Spirit",DefaultResponse=ECR_Ignore,bTraceType=True,bStaticObject=False)

Notice that bTraceType is set to true. This channel can now be used for traces in C++ and will also show up under Trace Type when modifying collision on an object.

3

That worked, thankyou <3