function RigidVehicle(options){
    this.wheelBodies = [];

    /**
     * @property coordinateSystem
     * @type {Vec3}
     */
    this.coordinateSystem = typeof(options.coordinateSystem)==='undefined' ? new Vec3(1, 2, 3) : options.coordinateSystem.clone();

    /**
     * @property {Body} chassisBody
     */
    this.chassisBody = options.chassisBody;

    if(!this.chassisBody){
        // No chassis body given. Create it!
        var chassisShape = new Box(new Vec3(5, 2, 0.5));
        this.chassisBody = new Body(1, chassisShape);
    }

    /**
     * @property constraints
     * @type {Array}
     */
    this.constraints = [];

    this.wheelAxes = [];
    this.wheelForces = [];
}
Simple vehicle helper class with spherical rigid body wheels.
@class RigidVehicle
@constructor
@param {Body} [options.chassisBody]