[vtk-developers] vtkImageReader2.cxx : FileLowerLeft default ?
oc-spam66
oc-spam66 at laposte.net
Sun Aug 17 06:33:03 EDT 2008
[Sorry for my first post to vtkusers at vtk.org instead of here]
Hello,
Could you change the default of "FileLowerLeft" in vtkImageReader2.cxx ?
The default is currently "0" and I think it should be "1".
Explanation :
Consider a file containing a 3D structured points dataset of scalars (the file is the succession of scalar values S_i, i = 1...(Nx*Ny*Nz)). Suppose the file is created with the following order : x increases first, then y increases and then z increases.
When I read this file with vtkImageReader, the data are arranged in the vtkDataArray with the following order : x increases first, then y DECREASES and then z increases.
I finally found that it is necessary to use "FileLowerLeftOn()" in order to have the expected order for y. I think that the current situation (where x,z increase and y decreases) is a gotcha. So if there is no side effect, could you consider changing the default ? this may prevent others from falling in this gotcha.
Regards,
O.C.
Note : I attach a short and self contained python script showing the behavior.
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