Although Doom III may not look as shiny as Half Life 2 or Far Cry, I believe it's engine lifetime will be considerably longer than those of other engines. Why do I say this? For a number of reasons. First, lets look at Carmack's track record. Many, many games use licenced versions of the quake engines. When Quake III first came out, it didn't look nearly as good as the quake III based games do today. Half Life 2 has all those fancy features thrown in from the start: Havok physics, DirectX 9 shaders, deformable terrain, and pretty much every bell and wistle out there. Doom III, on the other hand, seems to have a much simpler and elegant foundation. Instead of focusing on features and eye candy, it is geared toward stable tech that is used globally. For example,
everything in Doom III has a bump map.
everything is run through the per pixel lighting system. Advanced features can be implimented later, just like what happened with Quake III. Think of Half Life 2 like Windows: a shaky foundation with a wealth of features. Think of Doom III like Linux: Sparse, but is armed with an integrity to build on.
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