Moving Around in 2 and 3 Dimensions
Here are some differences between ground-level 3D and top-down 2D environments, and their implications for ease of navigation:
1. If the player is moving along a straight line, angles between objects will change only if parallax is present.
- The way the shapes of objects change as the player moves around the game environment. In 2D environments, rigid objects retain their projected shape as they change position and orientation due to player motion, while in 3D environments their apparent shape can change significantly.
- The way the angles between objects change as the player orbits around a particular point or travels along a path1, as measured from the camera's perspective. In 3D environments the apparent angles between objects are significantly affected as the player moves around, but remain fixed in 2D views.
1. If the player is moving along a straight line, angles between objects will change only if parallax is present.
Comments
http://www.designer-notes.com/?p=113
I agree for the most part, although because the world itself is 3D, a well made 3D virtual world can be easy (but not as easy as a 2d world) to navigate given that it is consistent. You don't usually need direction arrows in 2d games though :) or if there are some, they're pretty easy to follow :D
One of my interests is to figure out ways to make 3D environments more navigable. I'm still working on it.