The Source engine is a 3D game engine developed by Valve Corporation. Its unique features include a large degree of modularity and flexibility, an artist-driven, shader-based renderer, accurate lip sync and facial expression technology, and a powerful, efficient and completely network-enabled physics system.

Ttiki says

10/10 - Agree Disagree

This is inevitable of the biggest engine ever made. Remember, when they show to us this absolutely amazing physics, and that was a big revolution back then! Yeah, it's becoming old, and Source2 is coming, however, I think, Source 2 will never completely replace THE Source engine.
And again, it's lightning system or his cubemap system is pretty bad, now that we have real time lightning and cubemaps... But it gives it his little charm.

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Highest Rated (19 agree) 10/10

Even tho it is aging and it is beginning to show its weakness comparred to other more modern engines, it is still my most preferred engine and the only one I was able to get into succesfully. And with all of the updates Valve is giving it, I think the source engine will be with us for a long time. I wouldn't really recommend this for a commerical product, just because there are so many more modern engines out there that will be a lot easier in the long run (like UDK), but all of the commercial games…

Nov 16 2010 by Half_Kill