[ODE] Get vehicle speed from angular velocity of wheel.

[Jeff Weber]

Sorry, that was a typo in my post.  I just double checked my code and I am 
calling:
dJointGetHinge2Angle2Rate

So, given that.  The speed calc is correct, isn't it?  I think my problem is 
in converting things to my world units...


----Original Message Follows----
From: "Martin C. Martin" <martin@metahuman.org>
To: Jeff Weber <jeffreyweber@hotmail.com>
CC: ode@q12.org
Subject: Re: [ODE] Get vehicle speed from angular velocity  of wheel.
Date: Tue, 29 Jul 2003 11:12:57 -0400

Take a look at the docs.  Angle1 is the steering column, not the wheel
axis.  You need Angle2Rate.

- Martin

Jeff Weber wrote:
 >
 > Am I missing something here?  I want to compute the vehicle speed from 
the
 > angular velocity of the wheel.
 >
 > In general,
 >
 > d=r*theta  (where d=distance, r=radius, theta=angle)
 >
 > Therefore,
 >
 > speed = r*angularVelocity (from dJointGetHinge2Angle1Rate)
 >
 > (assume r is in meters and speed is m/s)
 >
 > It seems pretty straight forward, but when I measure the time it takes 
for
 > the vehicle to go a certain distance in my "world" while it drives at a
 > constant speed.  The numbers don't seem to jive.  Could be a conversion
 > problem (I put everthing into mph) but I wanted to make sure I have the
 > basics correct. Is my caculation for speed correct?
 >
 > -jeff
 >
 > _________________________________________________________________
 > Help STOP SPAM with the new MSN 8 and get 2 months FREE*
 > http://join.msn.com/?page=features/junkmail
 >
 > _______________________________________________
 > ODE mailing list
 > ODE@q12.org
 > http://q12.org/mailman/listinfo/ode

_________________________________________________________________
Protect your PC - get McAfee.com VirusScan Online  
http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963