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I know I should know this, but I could do with some reassurance.....

I have some code that isn't working properly, (objects not moving at the right speed), and there could be a number of reasons why it's not working - I just want to discount this as a cause.

Here goes:

Once you've set up a timer based loop, using something along the lines of ........

starttime=timer()

do

newtime=timer()-starttime
deltatime=newtime-oldtime
oldtime=newtime

loop

..... then I think I'm right in saying that to move an object along the x axis with a velocity v#, you'd say:

x#=x#+(v#*deltatime)

Question is this - how do you then adjust the velocity to make the object accelerate by an amount a#? Is it just

v#=v#+(a#*deltatime) ?


Thanks,

Ric.

Well, physics states that you are very much correct about velocity:

x = x + (v * Time)

And with acceleration, guess what, it's very similar. It's time squared.

x = x + (a * Time^2)

(That might not be the quite right equation. it's been a while since a physics class).

But "Ack!" you say. How does that work with my code?! And probably what I (and most everyone in my phys class was asking) "How the heck do you get time squared?" Well it ends up working out!

As it works, everything must be synced (as you know), and acceleration is no different.

v# = v# + (a# * Time)

Which all put together equals:

v# = v# + (a# * Time)
x# = x# + (v# * Time)

Which boils down to (if my brain is working correctly, I'm tired) YOU ARE ABSOLUTELY RIGHT! Looks like the same code I use for gravity (which is basically an acceleration of velocity in the downward direction )


NOTE: Not sure I understand your delta time system and my mind is fizzled from working on Strata Works right now, but I use a system like this:



Just seems simpler to me and I haven't had probs with it yet, but hey, to each their own.

Good luck on your project!

Cheers Wendigo - confirmed what I thought ... the bug in my program is somewhere else!!