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Wheeled Vehicle won't roll freely at start

Hi all. I am trying to implement a passive cart/trailer using the PhysX WheeledVehicleMovementComponent. I've followed the Simple Wheeled Vehicle Movement Component guide, and I'm pretty sure I have things rigged up correctly.

Essentially, the behavior I'm looking for is when I place a Wheeled Vehicle on a ramp, I want it to roll down the ramp. However, no matter what Wheeled Vehicle Movement Component settings I change, when I push Play the vehicle just sits there. If I raise the Pawn starting position slightly above the ramp so it falls a little bit when it spawns, it will sometimes roll down the ramp.

To reproduce, you can take the "Vehicle" Blueprint project and add a plane to the scene to make a ramp. Move the sedan pawn on the plane, and press Play. The vehicle won't move (other than suspension settling) until you give throttle input for a second or two. alt text

Do I need to set a flag or call some function at BeginPlay? I'm attempted "Activate" on the MovementComponent. Not sure what else to try.

(I could go back to using standard Physics Asset collisions, but I was hoping to use the tire models and suspension.)

Thanks! Dean

Product Version: UE 4.20
sedan-wont-roll.png (475.6 kB)
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asked Oct 05 '18 at 02:52 AM in Using UE4

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Dean R. Anderson
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