I'd like to share my implementation of this but A) Since I'm still running my game engine in a window and only for the editors at the moment, I've no idea if it even works. and B) It's so tightly integrated within my game engine, it would be hard to rip out and even harder to read. When I get a little further along the line and I actually have the game doing something ( ANYTHING! ) then I'd be more than happy to share the implementation ( assuming it works. ) However, that's not likely to be for a while yet.
I haven't looked at Kev's so cannot comment on that.
The problem with Grey's implementation is that his timestep is not fixed, defeating the purpose of the article. In a simple game which doesn't use any physics, this won't matter, but if you do use any physics, it will matter, and it will explode your simulation just as the article describes. I haven't looked at Grey's implementation in any detail, but if you're not going to fix your timestep, I don't see the purpose in doing anything more complicated than delta time anyway. This may simply be shortsightedness on my part, however.
Since T is implemented in exactly the same way in each type of timing Glenn uses, it won't be having an impact on your results. As far as I can tell, and without digging through all my rather complicated code, I'm pretty sure I assumed that T was the total simulation time, as you have.
I'll try to find some time on Monday or Tuesday to have a proper look at your version and see if I can compare it to my own. A perfect game timing system is very necessary, so it would be good for all of us if we can all have a good understanding of it.
I haven't looked at Kev's so cannot comment on that.
The problem with Grey's implementation is that his timestep is not fixed, defeating the purpose of the article. In a simple game which doesn't use any physics, this won't matter, but if you do use any physics, it will matter, and it will explode your simulation just as the article describes. I haven't looked at Grey's implementation in any detail, but if you're not going to fix your timestep, I don't see the purpose in doing anything more complicated than delta time anyway. This may simply be shortsightedness on my part, however.
Since T is implemented in exactly the same way in each type of timing Glenn uses, it won't be having an impact on your results. As far as I can tell, and without digging through all my rather complicated code, I'm pretty sure I assumed that T was the total simulation time, as you have.
I'll try to find some time on Monday or Tuesday to have a proper look at your version and see if I can compare it to my own. A perfect game timing system is very necessary, so it would be good for all of us if we can all have a good understanding of it.