sentences:  It was followed up by id Tech 6.The initial demonstration of the engine featured 20 GB of texture data (using a more advanced MegaTexture approach called "Virtual Texturing", which supports textures with resolutions up to 128,000 × 128,000 pixels), and a completely dynamic and changeable world.This technique allows the engine to automatically stream textures into memory as needed, meaning that developers need not concern themselves with memory restraints or texture limits.