Wheels Keep Detaching From Body (Vehicles 5.3)

I have modelled 3 skateboards in Blender now which I am trying to use with the Vehicle system as per the guide in documentation:

How to Set up Vehicles in Unreal Engine | Unreal Engine 5.0 Documentation.

Everything looks fine up until the point where I press play, and then the wheels decide to detach from the trucks and look horrible / ruin the handling.

Skeletal Mesh:

Physics Asset (All wheels have been changed from default to kynematic:

Blender assset with measurements:

I have also toyed around with multiple wheel radius, including the actual size to no avail.

Can anybody tell me what I’m doing wrong? It’s been two days now and can’t seem to find my answer via google

Sorry forgot to add, here is the final result!

afaik your rig is wrong, root at 0,0,0 , link all bones direct to the root (old school) check you bone names in the movement component ( wheel axis)

Hi, thanks for coming back.

I’ve tried setting the project up again 2 different ways:

Route 1)


Blender:
Set Origin To Centre of Geometry for each part of the board in blender.
Export X Forward, Z Up, Object Type: Mesh, No Leafbones

UE:
Import as Skeletal Mesh
Run through tutorial as normal
I have tried using with and without “look at” nodes for the truck in the Anim BP. Depending on the orientation I had the object facing in blender this either looks fine in the viewport, or the trucks / wheels rotate / clip & detach. Anim BP Below:

Physics Asset (collision turned off on trucks):

Skeleton:

Note this time I have set all bones as root of the main deck.

V1Longboard.fbx (86.3 KB)

I have also attached the FBX of the longboard if it would help anyone point me in the right direction, I just can’t seem to get this right!

try these, add to the standard vehicle template, ps i surgest you watch a few videos on vehicle set up (z-up,x-forward) not blender standard
SkateBoard.rar (471.9 KB)

1 Like

Thanks so much for amending the assets.

Unfortunately it won’t let me import the UAssets but your original comment got me back to the drawing board and think I had a number of bugs throughout.

I’m a bit gutted I can’t see what you’ve done as would like to know how it differs from my original set up.

If anybody else stumbles across this post, this is how I fixed it at least:

  1. Blender model was orientated the wrong way I think, made a new blender file and recreated the model (just board and wheels) with the object forward orientated in the X axis.

Set pivot point of each component to centre of their respective geometry’s and then parented everything to the main body.

Set scale in blender to 0.01m and then scaled my object by 100x. Reset rotation and scale transforms.

  1. I changed the wheel radius to match the sphere collision radius set for each wheels.

I also added a few additional settings not mentioned in the documentation by following video 2 of this tutorial and used it to sense check my existing set up. This is how i found out about the sphere collision for wheel radius rather than my original model.: 01 - Rig and export vehicles from Blender to the UE5. (UE5 Vehicle Tutorial) (youtube.com)

I’m not sure if I marked this as a question but if I there is anyway to mark as resolved / give you credit please let me know and thanks again for your help.

you don’t have to import, just copy/paste into your projects content folder, and set the playerpawn to Bp_Board

Hi Again,

Thanks for all of your help, just one more question please as I’ve had a look through the files and just want to confirm what you’ve done differently to make things work?

Am now at the stage where I’ve remodelled the skateboard and am likely to make several iterations so just trying to understand exactly where I went wrong as new models are having the same issue with wheels falling off.

In Blender, I noticed your FBX looks very different to mine:

Is this the fix for the wheels detaching? If so, what exactly have you done here?

Every object is parented to the Deck, but the trucks are rotated -90. The trucks are still attached to the wheel though so I don’t see how this can fix the collision issue?

I’m fairly new to modelling so apologies if this is a really noob question.

I notice you set up a control rig for the vehicle, but this is not included in the guide.

I fixed it, it turned out to be my suspension settings this time!

Made them more relative to the vehicle and finally no more wheels bouncing through the trucks!

Thanks again for your help

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Gald you got it working , tbh i don’t use blender much so the fbx was done in max, i did blender tutorials a long time ago for UDK but the principles are still the same,here’s a link to my channel some ue4 stuff as well as older blender

a guy called MathB has a load of videos about vehicles in UE5

Thank you mate :slight_smile:

Funnily enough I’ve been using MathB’s tutorial to implement some changes, i think the problem laid in my vehicle being about 10cm high but suspension settings at 40cm.

I’ll be sure to check out your channel though and thanks for all your help.