Wheel Controller

using UnityEngine;
using System.Collections;

public class Wheel : MonoBehaviour {

    [SerializeField, Range(-1, 1)]
    float _accelerationMultiplier;

    [SerializeField, Range(-1, 1)]
    float _brakeMultiplier;

    [SerializeField, Range(-1, 1)]
    float _steerAngleMultiplier;

    [SerializeField]
    Transform _mesh;

    WheelCollider _wheelCollider;

    #region Properties
    public float Acceleration {
        get {
            return WheelCollider ? WheelCollider.motorTorque : 0;
        }
        set {
            if(WheelCollider) WheelCollider.motorTorque = value * AccelerationMultiplier;
        }
    }

    public float AccelerationMultiplier {
        get { return _accelerationMultiplier; }
        set { _accelerationMultiplier = Mathf.Clamp(value, -1, 1); }
    }

    public float Brake {
        get {
            return WheelCollider ? WheelCollider.brakeTorque : 0;
        }
        set {
            if(WheelCollider) WheelCollider.brakeTorque = value * BrakeMultiplier;
        }
    }

    public float BrakeMultiplier {
        get { return _brakeMultiplier; }
        set { _brakeMultiplier = Mathf.Clamp(value, -1, 1); }
    }

    public Transform Mesh {
        get { return _mesh; }
        set { _mesh = value; }
    }

    public float SteerAngle {
        get {
            return WheelCollider ? WheelCollider.steerAngle : 0;
        }
        set {
            if(WheelCollider) WheelCollider.steerAngle = value * SteerAngleMultiplier;
        }
    }

    public float SteerAngleMultiplier {
        get { return _steerAngleMultiplier; }
        set { _steerAngleMultiplier = Mathf.Clamp(value, -1, 1); }
    }

    public WheelCollider WheelCollider {
        get {
            if(!_wheelCollider) _wheelCollider = GetComponent<WheelCollider>();

            return _wheelCollider;
        }
    }
    #endregion

    void LateUpdate() {
        if(!WheelCollider || !_mesh) {
            enabled = false;
            return;
        }

        Vector3 position;
        Quaternion rotation;

        WheelCollider.GetWorldPose(out position, out rotation);

        Mesh.position = position;
        Mesh.rotation = rotation;
    }
}