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Dark Java Dude 64

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Posted: 17th Nov 2010 03:25

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hey people, in know it seems like im posting a lot, and here's another one, lol!

So to the main point, i know that in a 3d game, if the fps goes down, so does the amount the object moves in one second. I know of dbpro games that constantly monitor fps and adjust the player move amount to keep every thing consistent. Ideally, i need a formula that could convert say, 60 fps into a rotation amount of 1 per frame for example, and an fps of 1 turn into 60 per frame. i have tried dividing with 60, but i get a divide by zero error because the fps starts at zero when any program starts. The other thing i was wondering was how do you keep the fps up without too much graphical sacrifice?

check my youtube channel at http://www.youtube.com/user/freeflightsimulator

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WickedX

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Posted: 17th Nov 2010 03:40

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Lee wrote an article about this in one of the news letters. Sorry, I don’t feel like sifting through the back issue. But, that’s were I’d look. Good luck.

Brian

Have netbook will travel.

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Dark Java Dude 64

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Posted: 17th Nov 2010 04:25

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Haha, thanks!

check my youtube channel at http://www.youtube.com/user/freeflightsimulator

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TheComet

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Posted: 17th Nov 2010 09:01

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If you're lazy, you can just use this little function I wrote once... Instead of using "sync", you call this function. It was originally designed for DBC, but it should run in DBP :

http://forum.thegamecreators.com/?m=forum_view&t=160974&b=6

TheComet

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KISTech

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Posted: 17th Nov 2010 18:14

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Do a forum search for Timer Based Movement. There's a lot to read on the subject.

For a little more advanced loop management, you can check this thread too.
http://forum.thegamecreators.com/?m=forum_view&t=175348&b=6

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Mobiius

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Posted: 17th Nov 2010 19:11

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@TheComet: Almost a year to the day! lol

My signature is NOT a moderator plaything! Stop changing it!

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Dark Java Dude 64

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Posted: 18th Nov 2010 03:06

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@thecomet that's a really nice function you wrote and it seems to work fantastically in a fantastically fantastic way

But how does it still seem smooth even when the syncrate is set to 1?

check my youtube channel at http://www.youtube.com/user/freeflightsimulator

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TheComet

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Posted: 18th Nov 2010 10:46 Edited at: 18th Nov 2010 10:49

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Quote: "@thecomet that's a really nice function you wrote and it seems to work fantastically in a fantastically fantastic way But how does it still seem smooth even when the syncrate is set to 1?"

Thanks!

Do you mean you set the actual sync rate to 1, or the comet-sync rate to 1? If you used cometSYNC(1,500), and sync rate 60, then your loop will still run at 60 fps, because the function can't handle negative speed correction. The function is only usefull if the actual sync rate is lower or equal to the comet-sync rate.

TheComet

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Dark Java Dude 64

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Posted: 18th Nov 2010 23:42

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I set the cometsync that way, i thought in the other post of yours it said not to use it at the same time you use the regular sync function-but i might not have understood correctly, i'm new to functions:

check my youtube channel at http://www.youtube.com/user/freeflightsimulator

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TheComet

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Posted: 20th Nov 2010 19:43

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Here's a fully converted function for DBP:

rem put this at the very beginning of your program

rem cometSYNC function
global c_syncrate as float
global c_update as float
global c_ssync as float
global c_offset as float
global c_stime as float
global c_time_elapsed as float
global c_oldtimer as float
global c_cloop as float
global c_lastloopsmissed as float
global c_loopsmissed as float
global c_result as float
global c_skip# as float
global c_incskip# as float
global c_sx# as float
global c_sy# as float

rem here's the function:

rem comet sync function
function cometSYNC(c_syncrate,c_update)
   
   rem get time elapsed
   c_syncrate=c_syncrate/(1000/c_update)
   c_ssync=c_syncrate
   inc c_syncrate,c_offset
   c_stime=timer()
   c_time_elapsed=c_stime-c_oldtimer

rem count loops
   inc c_cloop

rem check if 1 second passed
   if c_time_elapsed>=c_update

rem calculate loops missed
      c_lastloopsmissed=c_loopsmissed
      c_loopsmissed=((c_syncrate-c_cloop)+c_lastloopsmissed)/2

rem reset values
      c_result=c_cloop
      c_cloop=1
      c_oldtimer=c_stime

rem calculate when to skip next loops
      if c_loopsmissed<1
         c_skip#=0
         c_incskip#=0
      else
         c_sx#=c_syncrate
         c_sy#=c_loopsmissed
         c_skip#=c_sx#/c_sy#
         c_incskip#=c_skip#
      endif
      inc c_offset,(c_ssync-c_result)
      c_result=c_result*(1000/c_update)
   endif

rem sync
   if int(c_skip#)=c_cloop then inc c_skip#,c_incskip# else sync

endfunction c_result

+ Code Snippet

rem put this at the very beginning of your program

rem cometSYNC function
global c_syncrate as float
global c_update as float
global c_ssync as float
global c_offset as float
global c_stime as float
global c_time_elapsed as float
global c_oldtimer as float
global c_cloop as float
global c_lastloopsmissed as float
global c_loopsmissed as float
global c_result as float
global c_skip# as float
global c_incskip# as float
global c_sx# as float
global c_sy# as float


rem here's the function:

rem comet sync function
function cometSYNC(c_syncrate,c_update)
   
   rem get time elapsed
   c_syncrate=c_syncrate/(1000/c_update)
   c_ssync=c_syncrate
   inc c_syncrate,c_offset
   c_stime=timer()
   c_time_elapsed=c_stime-c_oldtimer

   rem count loops
   inc c_cloop

   rem check if 1 second passed
   if c_time_elapsed>=c_update

      rem calculate loops missed
      c_lastloopsmissed=c_loopsmissed
      c_loopsmissed=((c_syncrate-c_cloop)+c_lastloopsmissed)/2

      rem reset values
      c_result=c_cloop
      c_cloop=1
      c_oldtimer=c_stime

      rem calculate when to skip next loops
      if c_loopsmissed<1
         c_skip#=0
         c_incskip#=0
      else
         c_sx#=c_syncrate
         c_sy#=c_loopsmissed
         c_skip#=c_sx#/c_sy#
         c_incskip#=c_skip#
      endif
      inc c_offset,(c_ssync-c_result)
      c_result=c_result*(1000/c_update)
   endif

   rem sync
   if int(c_skip#)=c_cloop then inc c_skip#,c_incskip# else sync

endfunction c_result

TheComet

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Dark Java Dude 64

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Posted: 20th Nov 2010 20:07

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thanks

check my youtube channel at http://www.youtube.com/user/freeflightsimulator

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