Cristian Ramirez wrote:

> Your tutorial was very informative.
>
> Thanks a lot!
>
> LABourdillon wrote:
>
> > smb wrote in message <36CE973E.98F23561@stuttgart.netsurf.de>...
> > >
> > >Why don't you post the .mdl here as a microtutorial, prestep to the
> > >robot thing? I like 5 min crash courses, to get the principle.
> > >
> >
> > At the risk of raising the ire of some individuals regarding the posting of
> > binaries, I've attached a 4kb Moray *.mdl file that hopefully with show the
> > essentials of IK effects. I'm still experimenting with this myself, so this
> > info may not be complete or totally accurate.
> >
> > This Moray file uses a very basic set of the IK capability.   Moray V3.1
> > Build 4325
> >
> > * With IK "off", construct the plane, three cylinders, and knob in the usual
> > way
> >
> > * Construct a hierarchy as shown in the Select tab. That is, the FlagPole
> > consists of Section1 and  a group named Sliders. The Sliders group consists
> > in turn of Section2 and the union TopPole ( Section3 and the Knob).
> >
> > * Select the lower cylinder (Section1) and "freeze" it in all axes - access
> > the "Transformation Limits" menu via the Modify button  in the Modify tab.
> > Likewise "freeze" the remaining two individual Sections (cylinders) and the
> > Knob (sphere) of the flagpole
> >
> > * Select the Sliders group; and again access the "Transformation Limits"
> > menu. This time set the Z-axis range of motion (0 to 4 in this example) and
> > enable IK Usage. This enables the entire Sliders group to move in the Z
> > direction with a 4 unit range.
> >
> > * Select the "TopPole" union and in like manner set the Z-axis range (0 to
> > 5) , enable IK Usage for this union. This now enables the TopPole union to
> > move (an additional) 5 units in the Z direction. As the length of Section3
> > is 7 units, the total extended height of the FlagPole will be 7 + 4 + 5 = 16
> > units.
> >
> > * From the main menu bar, now turn IK "on" and by selecting the Knob, it
> > should be possible (with the mouse cursor) to extend/retract the flagpole.
> >
> > Note that Groups and Unions in the IK chain are generally assigned the
> > desired IK usage, while primitives (except for the last primitive) within
> > the chain are frozen. Hope this is of some help.
> >
> > ...larry
> >

>

Yup, thanks here too, larry! It makes the learning curve snacky. 5 minutes, and one
gets
the idea. This robot is just a lot of material to handle. 3 to 4 parts, great.

smb

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