What Revit Wants: Two frames for the price of one - cut walkthrough rendering time in half

Great post from Luke:
http://whatrevitwants.blogspot.com/2011/07/two-frames-for-price-of-one-cut.html

Are you sick of waiting ages for a Revit walkthrough to render? Using this technique, you can cut your walkthrough rendering time in half! Essentially, we make half the frames we need in Revit, and then use some post-processing software to interpolate extra frames. Here is how:

1. Create a rendered AVI walkthrough from Revit with HALF the frames you actually want. In other words, this walkthrough will be twice as fast as the walkthrough you will end up with.

much more to read...click to read the rest: What Revit Wants: Two frames for the price of one - cut walkthrough rendering time in half