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video tutorial on how to have a shifting axes to reflect a changing origin? post and replies

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video tutorial on how to have a shifting axes to reflect a changing origin?
lookang Avatar
lookang
222 Posts

is there any video tutorial on how to have a shifting axes to reflect a changing origin?

attached is a video where student wish to analyse a boat's motion with respect to another boat's position, assuming that other boat can be used as the reference.

https://www.dropbox.com/s/6u16xdmxd3owrmb/physics_pt_samanthayom_26_312offsetorigin.trz


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Replies to video tutorial on how to have a shifting axes to reflect a changing origin?

Re: video tutorial on how to have a shifting axes to reflect a changing origin? -
Douglas Brown Avatar
Douglas Brown
339 Posts

I don't know of a video tutorial (yet) but it is easy to do. Suppose you want the base of the mast of the rear boat to be the origin. Then just open the autotracker, set the target to axes origin, shift-click the mast base to mark a key frame and hit the Search button. Tracker will automatically set "fixed origin" to false so the origin can track the mast. It's really no different than autotracking a point mass--the autotracker just finds the best match and then "marks" whatever point is targeted.  Of course you could also do this with the mouse (drag origin or select it and shift-click the mouse where you want to place it), but in the case of the axes the video doesn't autostep to the next frame so autotracking is much easier. Doug



Re: Re: video tutorial on how to have a shifting axes to reflect a changing origin? -
lookang Avatar
lookang
222 Posts

http://weelookang.blogspot.sg/2014/05/tracker-samanthayom-student-video.html

 

enjoy my new tutorial video that explains how to do moving reference frame!

thanks prof doug!

http://youtu.be/Lu86kmk2PMQ

Post edited May 19, 2014 at 3:30 AM EST.


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