This was a follow up when I first started to create 3D Models using Blender, Maya, and then incorporating them into Unity3D, to build the environment. This is a video below of the forest including wind, gravity, and movent of the trees, while a moving camera takes you through the forest I created. You can view the video below, or on YouTube at Fly through Forest – Dev Mike.
You can learn more about this project at Fly Through Forest on Dev Mike, or play the Fly Through Forest Online via your web browser, or download the Windows Fly Through Forest application via DropBox (no account needed).