Mastering JBeam: The Ultimate BeamNG.drive Modding Guide BeamNG.drive stands out in the gaming world due to its soft-body physics engine. Every vehicle crash, bend, and flex is calculated in real time. The magic behind this system is JBeam, a proprietary physics text format. This guide will teach you how to master JBeam to create stable, realistic mods. Understanding the Core Architecture
JBeam uses a node-and-beam structure to simulate physical objects. It utilizes JSON (JavaScript Object Notation) syntax to define the skeletal properties of a vehicle.
Nodes: These are individual points in 3D space that contain weight and physical properties. Think of them as the joints or intersection points of a vehicle frame.
Beams: These are the springs that connect nodes together. They determine how rigid, stretchy, or fragile a vehicle structure is.
When a vehicle impacts an object, the physics engine calculates the forces acting on the beams. If the force exceeds a defined limit, the beams deform or break, causing realistic visual and structural damage. Setting Up Your JBeam Workspace
Before writing code, you need the right tools to ensure efficiency and minimize syntax errors.
Choose a Text Editor: Use Notepad++, Visual Studio Code, or Sublime Text.
Install JSON Plugins: Enable syntax highlighting for JSON/JBeam to catch missing commas or brackets quickly.
Locate the Directory: Navigate to your BeamNG user folder, typically found in AppData\Local\BeamNG.drive\latest\mods\unpacked</code>.
Create Your Mod Folder: Set up a clean folder structure mirroring the game’s core files: vehicles/[your_mod_name]/. Anatomy of a JBeam File
A standard vehicle JBeam file is divided into distinct sections. Each section must be enclosed in its proper bracket hierarchy.
{ “my_custom_vehicle”: { “information”:{ “authors”:“YourName”, “name”:“Custom Mod Car” }, “slotType” : “main”, “slots”: [ [“type”, “default”, “description”], [“my_custom_engine”,“my_custom_engine”, “Engine”] ], “nodes”: [ [“id”, “posX”, “posY”, “posZ”], {“nodeMaterial”:“|NM_METAL”}, {“frictionCoef”:0.5}, {“nodeWeight”:5.0}, [“n1”, 0.5, 1.2, 0.3], [“n2”, -0.5, 1.2, 0.3] ], “beams”: [ [“id1:”, “id2:”], {“beamPrecompression”:1, “beamType”:“|NORMAL”, “beamLongBound”:1, “beamShortBound”:1}, {“beamSpring”:1501000,“beamDamp”:150}, {“beamDeform”:45000,“beamStrength”:“FLT_MAX”}, [“n1”,“n2”] ] } } Use code with caution. Key Parameter Breakdown
beamSpring: Controls rigidity. Higher values make the structure stiffer.
beamDamp: Controls oscillation damping. Lower values cause your vehicle to bounce uncontrollably like a jelly mold.
beamDeform: The force threshold required to permanently bend the beam.
beamStrength: The force threshold required to break the beam completely. Use “FLT_MAX” for unbreakable parts. Crucial Steps for Structural Stability
Creating a functioning mod requires balancing weight and spring stiffness. Improperly configured JBeam structures will explode instantly upon spawning. 1. The Rule of Triangularization
Nodes connected in simple squares will collapse under their own weight. Always connect nodes in triangles or pyramids. Cross-beaming ensures structural integrity and prevents your mesh from flattening under gravity. 2. Node Weight vs. Beam Spring
Always scale your beamSpring and beamDamp values relative to your nodeWeight. If a node weighs only 2kg, an excessively high spring value (e.g., 5,000,000) will create too much energy, causing the physics engine to glitch and tear the vehicle apart. 3. Implementing Bounding Boxes
Define collision triangles (coltris) using your nodes. These coltris tell the game engine which parts of the vehicle should collide with environmental objects, terrain, and other vehicles. Debugging Techniques
Modding is a process of trial and error. BeamNG.drive provides powerful built-in tools to help troubleshoot your creations.
Ctrl + B: Toggles the node and beam visualization overlay in-game. Blue beams are intact, orange are deformed, and broken beams disappear.
Ctrl + N: Shows node names. This is vital for tracing which specific nodes are causing stability issues.
The Console (~): Check the developer console for red syntax errors. It will pinpoint the exact line of code causing a initialization failure.
Mastering JBeam takes patience, but understanding the relationship between nodes, beams, and physical mass opens up limitless possibilities for vehicle creation in BeamNG.drive.
To help you move forward with your modding project, please let me know: What type of vehicle or object are you planning to build?
Are you creating a mod from scratch or editing an existing game file?
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