Dimension/Depth/Space/Scale-animation design

I am a product development and design major with a professional interest in animation, so I thought this image from the film The Incredibles might be a good example of 3D animation technology and depth perception.
(soure: <http://freewallpaperspot.com/wallpapers/the-incredibles-wallpaper-4.jpg>)

Even though this is clearly a CG animated picture is still appears to have a 3D perspective. This image uses lighting and shading especially on the 4 characters as parts of them like their gloves, torsos, and hair have reflective surfaces and shadows. The ground shows that they are all casting shadows too. The background shows many trees and plants that also have shading but also have consistently similar sizes, relative sizes and a lot of overlapping. Many trees appears to be in front of each other so they appear to be overlapping. There is also the presence of gradient texture, some trees the appear closer have much more detailed textured surfaces  but the more distant the tree appear the those elements appear smaller. Even though the characters in front of the trees are probably smaller than the background trees, they appear to have a larger height-relative height. The Incredibles appear larger than the trees because those trees are farther back and lower in the field of vision than the Incredibles. This movie is a great example of my interest in animation and the 3D perspective image created by computers today.