http://ae.tutsplus.com/tutorials/motion-graphics/create-full-3d-reflections-with-falloff-using-form-or-particular/

Ever wanted to create reflections with Trapcode Form or Trapcode Particular? Now you can! You’ll learn not only that, but also how to create falloff of transparency and blur, just like in a 3d application. To do this, you will be creating a Matte using the new lighting tools in Form and Particular 2. Enjoy!