There are several applications in the Building Design Suites that allow us to communicate key design elements such as scale, ergonomics, and proportion in relationship to people, vegetation and vehicles.
Historically human scale has played an important role when designing buildings. One of the most well known is the Vitruvian Man - a drawing created by Leonardo da Vinci circa 1490.
During the modern architectural era, Le corbusier Modulor man was developed as a visual bridge between two incompatible scales, the Imperial system and the Metric system.
Contains RPC content which has featured in a number of applications for a while now.
3Ds Max Design
New for 2014 is the populate tab with people (was project geppetto on labs)
Check out this quick sample animation that I ran with some of the medical people
Trees – there are several sites that provide some excellent tree content including onyx trees that can be customized before loading into your scene
However if you want some free ones to start with xfrog have provided some trees on Autodesk seek
And if you want to animate them like Alex Roman http://vimeo.com/7809605 you can use this quick noise modifier as shown here
If you do want to go further Autodesk Area has 100 preset particle workflows available
And for vehicles evermotion has an excellent library