code: function createSphereFromRenderableShape(params, physicsJob) {
    const radius = params.radius || vec3.length(params.scale) / Math.sqrt(3);
    return new Sphere(0, 0, 0, radius, params.isStationary, physicsJob);
  }
docs: This assumes the base RenderableShape has a "radius" of one unit.
  
  @param {CollidableShapeConfig} params
  @param {CollidablePhysicsJob} [physicsJob]
  @returns {Collidable}