From: http://clootie.narod.ru/delphi/download_custom.html DebugRuntime sample This simple application detect is Direct3D8 or Direct3D9 debug runtime activated. It check registry key "HKEY_LOCAL_MACHINE\SOFTWARE\ Microsoft\Direct3D\LoadDebugRun

利用Direct3D9生成一个基于视点的连续LOD的三角形状平面网格。该平面网格可用于三维地形渲染。-Using Direct3D9 to generate a view-dependent continuous LOD triangular shape plane grid. The planar grid can be used for3D terrain rendering.