Tank Controller - Physics and Tracks System

About Tank Controller - Physics and Tracks System – Unity Editor Tool & Plugin

Tank Controller - Physics and Tracks System Unity Asset Overview

If you have ever tried building treaded vehicles using stock Unity components, you know the pain. Stock WheelCollider components are designed for cars—they completely fall apart when you try to simulate multi-wheel continuous track dynamics, resulting in jittery rotation, unnatural flipping, and zero-radius turns that feel entirely unconvincing. The TankController - Physics and Tracks System solves this fundamental architecture problem by ing stock wheel dynamics in favor of a hybrid raycast suspension and custom friction model.

In my experience testing physics rigs across desktop and mobile, this asset strikes a solid balance between arcade responsiveness and realistic weight distribution. The architecture splits the core responsibilities cleanly: TankPhysics manages center of mass, ground torque, and spring forces; TrackSystem handles track UV scrolling and bone deformation; while TurretController handles independent aim kinematics and barrel recoil impulse.

Core Technical Features & Highlights

The asset isn't just a basic movement script—it is a modular vehicle framework built specifically for heavy armor mechanics. Here is a breakdown of how the sub-systems function under the hood.

Physics Engine & Raycast Suspension

Instead of relying on heavy mesh colliders for tracks, the framework fires vertical raycasts (or spherecasts) from every virtual roadwheel down to the terrain. Spring and damper forces are calculated individually using standard Hooke's Law calculations and applied directly to the main Rigidbody via Rigidbody.AddForceAtPosition(). This keeps the physics pass lightweight while maintaining full contact ground hugging over uneven surfaces.

Dynamic Track Shader & Mesh Deformation

Track rendering is handled through two distinct methods depending on your target platform performance budget:

• Procedural UV Scrolling: Uses a lightweight shader that calculates wheel rotation speed and offsets the track texture UVs accordingly. Perfect for performance-constrained targets.
• Skinned Mesh / Bone-Based Tracks: Individual tread links bind to a bone chain that dynamically wraps around roadwheels in real-time. This provides realistic sag and deformation when climbing obstacles.

VFX, Shell Ballistics & UI Integration

Out of the box, the system ships with standard particle systems for track dust, exhaust smoke based on engine throttle, and dynamic muzzle flashes. Included ballistics scripts handle projectile gravity drop, shell dispersion angles, and armor angle deflection calculations. The bundled UI system features dynamic reticle aiming, shell reloading indicators, and damage directional hit indicators.

Ideal Use Cases & Game Genres

Depending on how you tweak the suspension dampening and torque curves, this asset adapts well across several distinct vehicle-focused sub-genres:

• Mil-Sim & Tactical Shooters: Excellent for realistic, heavy-feeling armored combat games requiring realistic turret acceleration and shell trajectory drop.
• Arcade Vehicle Shooters: Turn down dynamic track friction and boost motor torque for fast-paced, drift-friendly arena brawlers.
• Top-Down & Strategy Games: Disable complex bone deformation, toggle the raycast counts down, and run light UV scrolling shaders for RTS unit controls with minimal CPU footprint.
• Open World Action Prototypes: Quickly drop fully functioning playable armor units into expansive terrain maps with minimal dynamic setup required.

Quick-Start Unity Setup & Integration Guide

Setting up a custom tank model from scratch can take less than ten minutes if your hierarchy is properly structured. Here is how to configure the core controllers in your scene.

Step 1: Hierarchy and Rigidbody Configuration

Ensure your 3D asset has separated meshes for the main body, turret, main gun barrel, and individual roadwheels. Attach a Rigidbody to the root GameObject and assign a weight (e.g., 45000 kg). Set the interpolation mode to Interpolate to prevent visual stuttering during camera follow.

Step 2: Rigging Raycast Suspension

Attach the TankPhysicsController component to your root object. Create empty child GameObjects under each physical roadwheel mesh to act as suspension anchor points. Drag these empty transforms into the suspension array slots inside the inspector and adjust the Spring Force, Damper Rate, and Rest Distance.

Step 3: Custom Gameplay Hookup

Here is a practical C# bridge script showing how to feed input values into the controller and drive custom engine audio pitches based on internal speed parameters:

using UnityEngine;

[RequireComponent(typeof(AudioSource))]
public class TankEngineAudioBridge : MonoBehaviour
{
    [SerializeField] private Rigidbody tankRigidbody;
    [SerializeField] private float maxSpeedKmh = 50f;
    [SerializeField] private float minPitch = 0.7f;
    [SerializeField] private float maxPitch = 2.2f;

    private AudioSource engineAudio;

    private void Awake()
    {
        engineAudio = GetComponent<AudioSource>();
    }

    private void Update()
    {
        if (tankRigidbody == null) return;

        // Convert velocity magnitude (m/s) to Km/h
        float currentSpeedKmh = tankRigidbody.velocity.magnitude * 3.6f;
        float speedRatio = Mathf.Clamp01(currentSpeedKmh / maxSpeedKmh);

        // Smoothly interpolate engine audio pitch based on actual speed
        engineAudio.pitch = Mathf.Lerp(engineAudio.pitch, Mathf.Lerp(minPitch, maxPitch, speedRatio), Time.deltaTime * 5f);
    }
}

Pros & Cons Assessment

• Pros:
  • Highly reliable raycast suspension completely eliminates stock WheelCollider instability.
  • Zero-radius pivot turns work out of the box with proper differential track torque simulation.
  • Clean separation between game physics, visual deformation shaders, and user input mapping.
  • URP and Built-In Render Pipeline materials included out of the box.
• Cons:
  • Tuning center-of-mass and suspension stiffness requires patience to prevent tipping on sharp high-speed turns.
  • Skinned mesh tracks are visually superior but require careful bone rigging in Blender/3ds Max prior to import.

Frequently Asked Questions (FAQ)

Can this asset be optimized for mobile devices?

Yes. To run smoothly on mobile devices, use the procedural UV scrolling track shader instead of bone-based skinned meshes. Additionally, reduce the number of suspension raycast probes per track from 8-10 down to 4-5 key contact points.

How does the system handle anti-roll and center of mass?

The controller features a dedicated CenterOfMass target offset tool inside the inspector. Lowering the virtual center of gravity below the actual mesh geometry keeps the tank stable during steep incline climbing and high-velocity turns.

What is the usage policy regarding assets from this site?

Assets available on this platform are provided strictly for educational, testing, and evaluation purposes only—never for commercial production releases. If you intend to ship a commercial game, please purchase an official license from the Unity Asset Store to support the original creators.

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