[ODE] interpolating between physics frames to get the actual positions in the render time

[John DeWeese]

Err, that is to say, the window system may or may not double buffer, but 
it certainly doesn't sync your buffer with the display refresh. And it 
is in fact necessary to use double buffering in full screen mode in 
order to sync with the vertical refresh. Yeah!

John DeWeese wrote:

> Arright, so animation jitter occurs when the physics update rate is not
> an integer multiple of the framerate. If you want smooth animation in
> full screen mode, you want to keep the framerate as an integer multiple
> or divisor of the display frequency. If you're running in windowed mode,
> the window system double buffers so it doesn't matter.