Rune wrote:

> Just to check if my general understanding of the terms is correct: I'd say
> that gravity increases the speed of an object linearly (assuming the object
> is falling downwards). Is that correct?

Say that
    dP=V*dT   (change in position is velocity times time increment)
    dV=a*dT     (change in velocity is acceleration times time increment.

So for every frame,
    P[t+1]=P[t]+V*constant
    V[t+1]=V[t]+a*constant

In my systems,
    #declare velocity=velocity-0.1*y;
is how I usually do gravity.


As for air drag, I see a formulat at
http://web.syr.edu/~smdemar/rocketdrag.html  which I would convert to

#declare velocity=velocity-dragconstant*velocity^2;

where dragconstant=0.005;   //for starters

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