# Should I calculate in meters or pixels

In my car sim I am doing my calculations in Standard Units, except for the distance which is in pixels. Is this still correct (my guess is no) or should I use Meters ?

If I should use meters what is the best way to go about it? should I just pick a scale 10px = 1m or is there a better way to do this ?

Some additional info: I'm using Unity3D and using its physics engine.

• When you say that 1 meter = 1 pixel, it does not really matter. – Ivan Kuckir Mar 2 '13 at 10:31

• I don't think this is accurate advice. It's more important to have correct unit sizes (eg. corresponding to the meter scale) in order to have a realistic simulation. Having a pinball at the size of 0.02 units isn't going to make your simulation less accurate. Problems arise when you have objects with really large differences in size though. Eg. a pinball of size 0.02 colliding with objects of size 200000.0. – bummzack Mar 3 '13 at 11:18