function RotationalEquation(bodyA, bodyB, options){
    options = options || {};
    var maxForce = typeof(options.maxForce) !== 'undefined' ? options.maxForce : 1e6;

    Equation.call(this,bodyA,bodyB,-maxForce, maxForce);

    this.axisA = options.axisA ? options.axisA.clone() : new Vec3(1, 0, 0);
    this.axisB = options.axisB ? options.axisB.clone() : new Vec3(0, 1, 0);

    this.maxAngle = Math.PI / 2;
}
Rotational constraint. Works to keep the local vectors orthogonal to each other in world space.
@class RotationalEquation
@constructor
@author schteppe
@param {Body} bodyA
@param {Body} bodyB
@param {Vec3} [options.axisA]
@param {Vec3} [options.axisB]
@param {number} [options.maxForce]
@extends Equation