Seattle-based Umbra Software has announced that BioWare is using its occlusion culling technology in several franchises including Dragon Age and Mass Effect. The PC version of Dragon Age: Origins, which releases this week, is said to use Umbra's GPU-based optimization technology. Occlusion culling determines areas that cannot be seen by the player at a given moment and removes the need for the game engine to render those polygons, potentially improving the engine's efficiency by a ...