Originally Posted by DaveW
The HL2 engine is a hack the QUAKE ONE engine.
Sorry this is false. Utterly completely false.
What you are looking at is what valve admitted a long. That they started off with that foundation, reached a point. Had to stop with that foundation and start a whole new rendering engine. What you were looking at was part of the HL2 cabal source.
All reusable code is always reused in engines
But its ok believe what you want =)