Re: Kinematics Interpolation

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Simon Mills (simon++at++hal.wgs.estec.esa.nl)
Fri, 24 Oct 1997 09:30:55 +0200

Michael,

BOCCARA Michael wrote:
>
> Hi all,
> This question is not especifically a pf one, but a general 3D animation
> question.
>
> I know the following input space-time data :
> at time t1 : x1, y1, z1, vx1, vy1, vz1
> at time t2 : x2, y2, z2, vx2, vy2, vz2
>
> I want the interpolated : x, y, z for time t, where t1 <= t < t2
> The path should obviously be smooth and derivable.
>
> I know this may be a cubic spline (4 constraints), or something like that,
> but I would like to get a good formula, without re-inventing the wheel...
>
> the pfuPath utilities does not convince me, because it is working with a set
> of lines and fillets, while I am working with a discrete set of points and
> speeds. But maybe there is a simple way to convert my input data given above,
> into pfuPath input lines-arcs data...

We also need to do this frequently and our approach has been to write
interfaces to standard animation packages, so far Wavefront and TDI
Explore. Importing your key points and interpolating them is very easy
in both Wavefront and Explore. The animations are then exported into a
format suitable for reading in real time by our Performer applications
using the library. Of course you need access to Wavefront or Explore...

-- 
Regards, Simon


======================================================================
Simon Mills
Silicon Worlds S.A.
c/o System Simulation Section (WAS)
Automation & Informatics Department
European Space Research And Technology Centre (ESTEC)
Postbus 299                           e-mail:   simon++at++wgs.estec.esa.nl
2200AG Noordwijk                      phone:    +31-(0)71-565-3725
The Netherlands                       fax:      +31-(0)71-565-5419
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