The creator also mentions realistic weapon ballistics, where bullets actually fly and do not hit the target immediately, physical and thermal smart surface properties for more realistic interactions with fire and electricity, voxel density, object deformation, interactions with characters and facial animations, and a mood system for NPCs.
Moreover, Valve is seemingly preparing volumetric game events, optimized crowds and background characters, a crawl state for NPCs, dynamic physical collisions and ragdolls, NPC damage and destruction system, interactions with liquids and weather conditions, dynamic wind and airflow systems, which interact with grass, foliage, and hair, graphics and dynamic, volumetric fog, ray tracing with supersampling and ray reconstruction.
You can see the code and examples of these features from other games in Gabe Follower’s video above.
