Seems like were going to get more visitors :)

[TGE]

http://info.sonicretro.org/SCHG:Sonic_Ge..._Importing

Quote from the page:

SCHGonic Generations/Tutorials/Level Importing
From Sonic Retro
SCHG: Sonic Generations
Main Article
Objects
File Index
BB2
Tutorials
Level Importing

This is a tutorial on how to import custom levels into Sonic Generations.

Contents
1 Required Tools
1.1 Step 1: Finding the stage
1.2 Step 2: Importing into 3DS Max
1.3 Step 3: Scaling the stage
1.4 Step 4: Rendering GIA
1.5 Step 5: Exporting the level geometry
1.6 Finale Part 1: Importing the geometry into SonicGLVL
1.7 Finale Part 2: Creating and importing collision into Sonic Generations


Required Tools
SonicGLVL
Generations Archive Editor
Autodesk 3DS Max 2011 (Sign up for a student license to get it free)
Easy Ogre Max Exporter for 3DS Max
Havok Content Tools for PC (Havok 2010 2.0)
Step 1: Finding the stage
You can go on The Models Resource and find stage rips there, or you can use Google. Either way, blablabla tech stuff