IK1  (2010-Jan-12 12:21 EST)

by <>  (2010-Sep-03 7:42 EDT)

I forgot to mention but this is inspired by Abe-san's robot arm project on Japanese SuperSwiki2 site.

by <>  (2010-Sep-03 7:42 EDT)

What a powerful beautiful project.
I do enjoy the challenge of finding out the details on my own, but would appreciate a short description of the rational of your search.
Thank you Yoshiki!

by <>  (2010-Sep-03 7:42 EDT)

Thanks Scott.

Right now, rotation around shoulder is favored than rotation around elbow, so it appears to make unnecessary shoulder movement first then adjust it by moving elbow. By weighing the distance, it can be more natural. So, a challenge would be to make such change.

Going for 3 joints is certainly fun.

What Etoys is missing is that when an object is embedded into another, we can't get the objects' global position when one of them is rotated. If it is possible, a complicated script can go away.

by <>  (2010-Sep-03 7:42 EDT)

A beautiful and deep example, appealing and instructive at many levels. Don't miss this one!

by <>  (2010-Sep-03 7:42 EDT)

Hi,

I'm curious to hear a bit more when you say "use" my projects. How this one for example is used and how does it fit in the course?

by <>  (2010-Sep-03 7:42 EDT)

Thank you for submitting this! I will definitely use this in my class.

by <>  (2010-Sep-03 7:42 EDT)

Carlos,

BTW, I had another project ("Roulette") I uploaded while ago and you apparently commented on it, but I don't see the project being public. Do you know what is going on?

by <>  (2010-Sep-03 7:42 EDT)

Hi, Carlos,

Thank you for the comment!

"Forearm" and "upper arm" are terms to refer to the parts of an arm. (Why one is written with space and another without is not clear, though).

As I wrote in the project, this project involves a two variales function and dynamic solution finding technique. It is still a bit too advance to econdary schoolers.

Abe-san made a project with different idea (not based on inverse kinematics but does similar thing). This would be ok for secondary school.

http://squeakland.jp/seaside/SBSuperSwiki/80c9ca3f-676b-462b-8665-774ce1f376dc

by <>  (2010-Sep-03 7:42 EDT)

An excellent idea.

Works very well.

Will keep it as a good example to study in detail for a long time. It shows many of the possibilities of Etoys I have never tried.

At the beginning I thought you should have added many more explanations about how it was done. Also thought the names of the objects could have been a bit longer and more descriptive.

But then, I was proud of discovering a lot of things by myself.

Wonder what would be the opinion of a teacher, I guess making me suffer a bit has probably benefited me more than showing me the easy way to understand it??

Very timely for Uruguay where the XOs are reaching secondary school. I imagine this would be for not so young kids.

by <>  (2010-Sep-03 7:42 EDT)

Thanks Avigail for checking an old project when navigating to them is not easy :-)

The search relies on the fact that the search space has no local maximum; there are usually two maxima but they are at the same "height". I don't know the mathamatical term to describe such a space.