Default 3D Models by Sibsib92 as you already noticed is a very very unique minecraft resource pack. Why? Because instead of simple resource packs it uses 3D Models. Yes, 3D! This awesome thingy was created by Sibsib92 and let’s say thanks to him for this awesomeness! You can check some screenshots below to make sure that it is true 3D!
How to Install This Default 3D Models Resource Pack 1.8 ?
Default 3D Models Resource Pack 1.8 Download Links