I would have expected 0.222 here. Where does the rest 0.000000003 come from - incorrect rounding from cpu?
No. It's more a case of innacurate floating point operations. Since floating point numbers are stored in a finite ammount of memory (32 or 64 bit, depending on accuracy) most floating point numbers can never be represented entirely accurately. They are however accurate enough for most non sub-molecular research tasks. How do i make trails with the existing concept?
Build a list of objects, and store the old "trail" position in it. The "CircleMania" example does this. Increasing the framerate depends too much on the display of the user and moreover steals processing power.
No. Choosing the frontbuffer anyhow would be the best...
No.