When developing games in Unreal Engine, creating accurate collision meshes for vehicle models is crucial for realistic physics interactions. In this tutorial, we will walk through the process of refining the collision mesh for a vehicle using Unreal Engine’s Physics Asset Tool (PhAT). We’ll focus on adjusting the physics mesh to fit the actual model of a car more accurately.

Step 1: Open the Physics Asset Tool

Start by opening your vehicle model in the Physics Asset Tool. Right-click on the vehicle model in the Content Browser and select “Edit Physics Asset.”

Step 2: Select the Car Body

In the PhAT, select the “carBody” from the Skeleton Tree. This will allow us to modify the physics bodies associated with the main structure of the car.

Step 3: Modify Body Creation Settings

With the “carBody” selected, navigate to the ‘Tools’ panel on the right-hand side. Under ‘Body Creation’, change the ‘Primitive Type’ to ‘Multi Convex Hull’. This setting helps in generating a more complex and fitting collision mesh around the car model.

Step 4: Re-generate Collision Meshes

After adjusting the settings, click on “Re-generate Bodies” at the bottom of the tools panel. This action will create a new set of collision meshes that better conform to the actual shape of the vehicle, ensuring more accurate physics simulations.

Step 5: Review and Adjust

Once the bodies are re-generated, review the new collision mesh. Ensure that it closely matches the contours of the car model. Make any necessary adjustments by manually tweaking the vertices of the collision primitives, if required.


By following these steps, you can create more realistic and accurate collision meshes for your vehicle models in Unreal Engine. This ensures better physics interactions and enhances the overall gaming experience. Remember to test the new collision setup within your game environment to validate the performance and behavior.

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