function Sphere(options) {
    Particle.call(this, options);
    var r  = options.radius || 1;
    this.radius = r;
    this.size = [2*r, 2*r, 2*r];
    this.updateLocalInertia();
    this.inverseInertia.copy(this.localInverseInertia);

    var w = options.angularVelocity;
    if (w) this.setAngularVelocity(w.x, w.y, w.z);

    this.type = 1 << 2;
}
Spherical Rigid body

@class Sphere
@extends Particle
@param {Object} options The initial state of the body.