hello, Thomas
Thank a lot for your patience.
I do understand ( i guess ) the mechanism.
We will have only to calculate the orientation ( trigonometry application
) .
Which is not the worth.
Regards
ahmad
On 8 May 2013 16:35, Thomas Geymayer <tom...@gmail.com> wrote:
> 2013/5/8 grtuxhangar team <hohora...@gmail.com>:
> > Hello, Thomas
> >
> > Sorry my question was not clear, and i probably misunderstood the
> feature.
> > So,
> > just a question: how do you define the main parent actuator axis
> rotation ?
> > that one which trigger every other child components.
>
> I am using the normal rotate animation to rotate the main strut. Every
> attached hydraulic cylinder, link, etc. is then animated using the
> locked-track animation. For a hydraulic cylinder the piston and the
> cylinder housing each are animated using a locked-track animation
> tracking each other. For a gear scissor, a locked-track animation
> tracks from a point attached to the strut to a point on the axis. Two
> objects can be attached to the animation, allowing to animate a
> scissor. (The object and the slave object, are rotated such that the
> exactly fill the space between the two attachment points of the
> scissor). For the second type of animation I will add some pictures to
> the wiki later on.
>
> > Most of them are not rotating with a pure xyz axis rotation but very
> often
> > according to those alternate form (cf Vivian) .
>
> There is no difference in terms of what you can express. Both
> notations allow you exactly the same thing. For the animation a center
> point and an orientation (axis) are required to calculate the location
> and orientation of the rotation. Think of the center as the location
> of the hinge somewhere in space and of the axis as the actual
> orientation of the hinge.
> You can now either specify the position of the hinge and the
> orientation of its axis or (the alternate form) two points on the axis
> of the hinge, which are then used to calculate the center and
> orientation of the hinge. (If you use the alternate form the center
> and axis are automatically calculated from the two given points).
>
> There is no rotation that you can not describe with a single axis
> given by its xyz coordinates.
>
> > That the point i was asking for, and the solution i was looking for.
> > I could be on the wrong way.
>
> Tom
>
>
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