[ODE] Units confusion

[Zulfiqar Malik]

That's exactly what I thought, but apparently its not working that way.
I want to express mass in kg, distance in meters and time in seconds
(and hence force in Newtons). So, just for testing I added an object of
mass 50kg (0 friction coefficient). My timestep is 0.016 seconds. I want
to accelerate this object by 300 m/s/s. So F = ma tells me that I should
apply a force of 50 * 300 on that object, right? But the object doesn't
even move although the friction coefficient is 0. 

Regards,
Zulfiqar Inayat Malik. 

-----Original Message-----
From: ode-bounces at q12.org [mailto:ode-bounces at q12.org] On Behalf Of Aras
Pranckevicius
Sent: Wednesday, May 18, 2005 5:05 PM
To: ode
Subject: Re: [ODE] Units confusion

> AFAIK ODE is using the MKS system (Meters - Kilograms - Seconds). But
I
> could be wrong.

ODE uses whatever units you supply to it. It you like expressing
distances in parsecs, masses in pounds and time in 1/7th of average
dog's lifetime - it's fine.

Precision issues aside, you can supply that to ODE directly. Just make
all units consistent (eg. gravity is expressed in distance-units
divided by time-units-squared, so plug in a value that makes sense in
your situation). Same with masses, timesteps, etc.

-- 
Aras 'NeARAZ' Pranckevicius
http://nesnausk.org/nearaz | http://nearaz.blogspot.com

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