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physical units

Topics: Developer Forum, User Forum
Oct 23, 2007 at 5:41 PM
I haven't started playing with the new version of Farseer yet, so maybe this information is already available.

I was wondering if, given that this is supposed to be a realistic physics simulation engine, you could give us some idea of the units for the physical quantities involved? For example, how do Farseer mass quantities relate to real mass in, say, kilograms? Are forces in Newtons? etc.

This would make it easier to pick ballpark starting values for the physical quantities.

Oct 23, 2007 at 7:07 PM
Untis are arbitrary as long as you are consistent with what you use.

You could arbitrarily say 50 pixels = 1 meter then you just need to convert between simulation units and display units.
Oct 23, 2007 at 9:45 PM
So, we could give an object a mass of 50, apply a force of 50 and expect the object to accelerate at a rate of 1 so that in 1 second the magnitude of its velocity reads 1?
(This would be the correct result if units of kg and N are used.)
Oct 24, 2007 at 12:35 PM
Should be close to that but you need to factor in a slight amount of linear drag.