Adding a custom car

[kasperhaak]

Hi,

I've tried adding a custom car to the Carla game. However whenever i start the simulation with the custom vehicle, the car spawns, falls to the ground and then bounces off never to return again. I can't really figure out whats going on, that's why i'm turning here for help.

Some info about the car:

• It is within the 10.000 - 17.000 triangle limit
• The bone names are Base_Vehicle, Front_Left_Wheel, Front_Right_Wheel, Rear_Left_Wheel, Rear_Right_Wheel
• The Base_Vehicle bone is setup at the origin (0,0,0)
• The bone positions of the wheels are set up in the middle of the wheels
• The model and the bones are oriented to the positive X-axis and Z-axis up

Furthermore I followed the How to add assets guide in order to model the blueprints. I can't figure out why the car is flying off after it reaches the ground. Any help is much appreciated.

Thanks in advance

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[pl-ai]

I have the same issue

[krdindorkar]

@kasperhaak @prashantluitel I am having same issue. Did you resolved yours? Kindly help me

[peclatj]

Hi, I have the exact same issue after following the guide to add a vehicle. I tried to change the collision box but it change nothing.

The vehicle spawn and start gaining speed by itself, until it rolls over and fly off in the sky.

Edit: I noticed the vehicle does not fly away when gravity is disable its physic asset. Also if in the BP I change the skeletal asset with the one of another vehicle, it is fine.

[peclatj]

I found a solution, It has to do with the armature of my mesh in blender. I have no idea why but mine does not work but the armature provided (https://carla.readthedocs.io/en/latest/tuto_A_add_vehicle/) on the 2nd tutorial works, I'm unable to find a single difference in the parameters in blender between the two armatures.

EDIT: I found the difference between my two armatures, it's only the scale. I had to scale down my armature by 100 (0.01 instead of 1.0) and then to compensate scale up the bones and my mesh in edit mode by 100. It results in the same visually but this make it work in Unreal.

I tested multiple times, the scale of the mesh does not affect it. But the scale of the armature has to be 0.01 or 0.001 but not 1.0 nor 0.1.

My units in blender are Meters and the scale is 1.0

I have no words...

I found a thread that says it is a well known issue https://forums.unrealengine.com/t/blender-to-ue4-rig-scaling-problem/440629 maybe it is worth saying that in the tutorial. It would have save me two whole days T_T.