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In most programming environments I've worked with, one of the best ways to deal with motion of objects in the game is to have a master loop which does something like the following:

do forever:

compute the elapsed time since last update occured(T)

update all objects based on the value of T

obj1_velocity_x = obj1_velocity_x + obj1_accel_x * T
obj1_x = obj1_x + obj1_velocity_x * T
...

update the screen

The thing I'm not getting is how the above approach will work with a specified SYNC RATE? What does DB do if we have surpassed the SYNC RATE... sleep?

Also, does the SYNC command wait for a vertical sync on the video card?

Thanks,

Ed

You have to handle your sync on your own instead of using sync rates:

sync on

do

compute the elapsed time since last update occured(T)

update all objects based on the value of T

obj1_velocity_x = obj1_velocity_x + obj1_accel_x * T
obj1_x = obj1_x + obj1_velocity_x * T

sync
loop

The only thing the sync does is set the maximum framerate your game can achieve; sync rate 60 will give you a max of 60 fps. If you say sync rate 0 it will go as fast as the processor allows, though most monitors have a limit of 200 fps. you should use the timer() and screen fps() commands to do the calculations you want.