I have a 3D 128^3 volume of data, containing a velocity vector. I
use a vtkArrayCalculator to extract a single component of the velocity
(X in this case), and use the vtkImageFFT to compute a Fourier
Transform of the data.<br>
<br>
The original data is of the range -0.02 to 0.02, but computing the magnitude of the resulting FFT dataset yields a <span style="font-weight: bold;">minimum value</span>
of 6*10^20, and a Maximum of over *10^24. Can anyone explain what
might be happening here? Parseval's theorem states that the
resulting FFT should be of similar magnitude to the input data.<br style="font-weight: bold;" clear="all"><br>-- <br>Randall Hand<br>Visualization Scientist<br>
ERDC-MSRC Vicksburg, MS<br>