When you make the instance of a new flux.slider, just add to the option object parameter the key transitions with, as value, an array with a single element.
The element is a string containing 'bars3d'.
I edited the relevant part of your code
For complete reference see https://github.com/joelambert/Flux-Slider
window.f = new flux.slider('#slider', {
pagination : true,
transitions: ['bars3d']
});