Multi Tier Game?

[rliq]

When I write a web/database system at work. I have multiple tiers/layers, ie DAL, BLL, UI, Datasets etc. I make these separate sub-projects and when I have an issue the structure usually helps me go straight to where the problem is.

Is there a similar structure that will put me on a good foundation for writing a game in Direct3D (in my case C# 3.0/2008)?

My game (hobby) will start of small, but I have big ideas for it and I'm sure I will get similar issues to those I get at work if I don't start out with the a good underlying structure...

Thank you for any advice...

[toraj58]

in games it would be like this:

game engine (ogre, Irrlicht Engine, allegro, Torque engine, quake engine, doom engine, delta 3d, rage, C4)
physics engine (havok, Newton Game Dynamics , Physics2D.Net, PhysX, Simul-X) and euphoria: i realy like this one, look at here: http://www.naturalmotion.com/
AI Engine
Scripting Language (Phython, Lua, Perl)
Direct3D, OpenGL, XNA