[quote author=lookang link=topic=2084.msg8284#msg8284 date=1310396519]
[quote author=egabev link=topic=2084.msg8281#msg8281 date=1310274143]
[quote author=Fu-Kwun Hwang link=topic=2084.msg8280#msg8280 date=1310269202]
The green circle moves when pitch value change (when you drag slider). The rotating axes is the green arrow.

Do rotational axes for raw,pitch and yaw are three orthogonal axes?
Please let me know the rotational axes for the pitch rotation you want.
[/quote]

Yes. Rotational axes for roll, pitch and yaw are 3 orthogonal axes or let say perpendicular to each other. Please make analogy with the airplane movings (attachments). Pich is simple up and down the nose of the plane; roll is wings up and down; yaw is rotation arround the vertical axis. Pitch is X axis; Yaw is Z and Roll is Y. I hope this will be helpful. Please note that my geometry is at the level of Medical University which is quite basic. I was waiting all the night at my office for your reply. Many thanks for your kindeness to reply very quickly.

Please have the second attachment (more clear view of the axes PRY). It was failed to appear by my previous submission.
[/quote]

I think it is the naming convention that needs to be standardized tho the plane's picture.
i change it for your convenience.
is that closer to what you need egabev?

*** Click
[ejsapplet]
to view it. ***

author: Fu-Kwun Hwang, slightly edited by lookang
changes made.
naming convention change to suit airplanes as in picture
made 19 closest instead of 361
set initial values to all zero
range of slider -180 to 180 degree
added play pause button
axes implementation added instead of box for clearer orientation when talking about pitch roll and yaw
[/quote]
Thank you very much for your efforts to modify the applet. It is really going closer to my needs. I beg you just 1 thing. You are correct. Roll (green circle) is rotating but arround its circumference. Thus it simulates the so called gimbal lock (see http://www.youtube.com/watch?v=rrUCBOlJdt4)
I beg you very kindly to make the rotation of Roll such as its cross section to rotate instead just as the Roll at the  picture on message #4 above. Also please make back the rotation from 0 to 360 degrees instead of +/- 180 degrees since I have to check combinations of virus (HIV) position  such as Yaw 300 degrees, Roll 180 and Pitch 120 degrees. Thanking you once more I am with most firendly and warmest regards. egabev.