Delta Force was the first game to use voxel technology, which allowed outdoor 3D environments to be rendered far more effectively than with Textured Polygons, although not quite as sharply or attractively.
Delta Force's gameplay was top notch, emphasising strategy over killing. However, AI and the still developing voxel graphics (and a lack of falling damage) let it down. Its revolutionary graphics system did not replace textured polygons, and has not done so yet.
