How to attach a trailer to a tractor truck with VPVehicleJoint?

Question

I'm working on a semi-trailer and need to attach the trailer to the tractor, but VPVehicleJoint doesn't seem to lock them together.

Answer 1

Quick guide to use VPVehicleJoint for attaching tractor + trailers:

• Put the VPVehicleJoint component in the trailer, specifically in the Transform that will be the attachment point.
• Configure "Other Anchor" with the Transform that will be the attachment point in the tractor.
• Configure all linear constraints (X, Y, Z Motion) as Locked.
• Configure the angular constraints X, Y (Angular X, Y Motion) as Free.
• Configure the angular constraint Z (Angular Z Motion) as Locked.
• The colliders in both parts should allow them to articulate at the junction point without contacting.

The VPVehicleJoint component may be disabled and re-enabled to detach / attach the trailer. Ensure that both attachment points are at the same world position before enabling the component. Otherwise, both parts will jump suddenly to join the attachment points.