Interpolation of a discrete 3D trajectory

[Jules César]

Peter Beattie a écrit :
> Hey guys,
> 
> I'm looking for a way to smooth out the edges of a 3D trajectory that is
> really just a sequence of points in space. I've got co-ordinates just
> like these:
> 
> 0.072 -0.25 0.582
> -0.036 -0.25 0.644
> 0.036 0.338 0.104
> 
> What I would like to have now is for the trajectory not to pass through
> the individual points at a sharp angle, but to have an interpolated
> curve instead.
> 
> Is there a reasonably easy way from, say, a 10 co-ordinate input to get
> a 90 co-ordinate output with the 8 inner nodes replaced by a 10-point
> quasi-curve?
> 
> (A cookbook recipe and SciPy didn't seem to contain obvious solutions.)
> 
Something like
newdata= FFT.inverse_real_fft(FFT.real_fft(data),newlen)*newlen/len(data)
should be enough ?
+ maybe have to add some Hanning windowing filter to keep limits clean.