What you propose is a little old school. A step up from CPU based ROAM but a step down from modern geoclipmapping (a monolithic draw for all the terrain). At the newer end of the spectrum, you could have a single grid that uses tessellation based on distance and rockiness. Depends on if you want to support DX9.0, 10, 11.1 or 12.
TeaTreeTimMember Since 18 May 2009
Offline Last Active Yesterday, 03:15 AM