The upcoming version 2.0 of the graphics engine will add several new features, such as outdoor levels, displacement mapping, a physics engine and DirectX 9 effects. When asked why the engine didn't support DirectX 9 to begin with, the developers explained that NVIDIA cards suffered a performance hit of up to 30% when switching from DirectX 8.1 to DX 9, and that they wanted to get to the bottom of that phenomenon before making the switch. GSC did not comment on whether this also holds true for ATI cards, but the statement is strongly reminiscent of Gabe Newell's comments, who ran into similar problems with NVIDIA cards while working on Half-Life 2.