How to move more then 1 object on spline

[DarkMicrowave]

I need yout help. I created a simple Animation on Spline but i need multiple Objects for an conveyor belt.

Only one cube is moving:

Blueprint:

Any idea how to make this with a lot of objects? I can’t find any tutorial for this.

Thanks for your help.

[Mind-Brain]

Hey DarkMicrowave! Welcome back!

So here the problem is your event.
You should have an event (Say an input action event, “Event SpaceBar” or something) Spawn a BP of an actor, then use a dispatcher to run an event with all of this code on the actor object. The dispatch message should include the spline as an input so you can carry over the reference with an output

Here are some links if you need a refresher or you don’t know how dispatchers work:

Actor Communication

Event Dispatchers / Delegates Quick Start Guide

[Everynone]

Move multiple actors along spline

Here’s a simplified (compared to yours) script I’d use were I to push numerous actors along a spline: [328859-screenshot-4.jpg] [Image from Gyazo] Essentially, each car stores an offset. We animate another spline offset using a timeline, add both, and reposition the car. An optional Modulo wraps the value so we get perpetual motion.

[DarkMicrowave]

Wow thank… But how i can get this offset in SpawnActor? And i need to add both on begin Play?

[Everynone]

Any variable flagged as:

Will show up on the spawn node; you may need to right click and refresh the node.

And i need to add both on begin Play?

Not necessarily. It really depends on how the conveyor is supposed to work.

If the player comes over and drops an actor on the conveyor, there’s no need to spawn a new one, you’d add an existing actor to an array and calculate a new offset. The offset does not even need to be in the actor.

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Depending on the desired complexity, you could create an X number of invisible dummy anchor points moving along the spline. When the player drops an item, we’d attach it to that dummy.

Or use actual spline mesh components that can deform. Dropping something onto a spline mesh, snaps the actor to it. This way, the actor does not care about any offset, it rides attached to a dummy that follows a spline anyway.

[DarkMicrowave]

That sounds really good. My plan was to create a track treadmill using the code. The player drops the pallet on it and the physics do the rest. It becomes a logistic simulation.

Is that a good idea or is the physics too unreliable?

I’m not a pro in UE yet. I’m still learning.

The conveyor belts are then supposed to start or stop using various triggers.

[Everynone]

@DarkMicrowave

Is that a good idea or is the physics too unreliable?

Honestly, hard to tell. Is this closer to what you’re after:

Move actor on conveyor belt unreal engin4

Can you confirm this is what you want: [Image from Gyazo] I’ll zip the project and push it your way if you’re happy with this functionality.

The attached project is still up, but it’s probably a much version of UE4. You could try to convert it, it may just work…

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And we can also try poking @Tuerer, and aks nicely how this works:

Move actor on conveyor belt unreal engin4

Yesterday, someone here asked a question how to make an actual physical conveyor belt, but they deleted the question after ten minutes or so, but I was already curious. So I made an actual moving belt like this. It might be a bit expensive if too long, but if you’re interested, I can share the setup.

[DarkMicrowave]

Thanks that helped me a lot. Now the assembly line works. What I’m still missing is the rotation. They don’t turn in the curve. Tried to insert the Rotation Along Spline.

Blueprint: Assambly Line posted by anonymous | blueprintUE | PasteBin For Unreal Engine

Zoom out to see the complete BP