[vtkusers] How to set the vtkMatrix4x4 in function SetResliceAxes() of vtkImageReslice

[时光]

Hi,


In Class vtkImageReslice , virtual void vtkImageReslice::SetResliceAxes (vtkMatrix4x4 *)
Why Matrix:
1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1 

can get a slice that parallel to the XY plane?


What the Matrix means in mathematics?


Where can I get the detailed description?


Thanks,
Yihui Cao
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