# [vtkusers] How to create resliceAxes from two points in a curve?

Xing Li lihouxing0710 at gmail.com
Thu Mar 14 03:28:47 EDT 2019

```You can use vtkMath::Perpendiculars(A,B,C,0) to generate the other two
directions, where A is p0-p1 or p1-p0

richard anderson via vtkusers <vtkusers at vtk.org> 于2019年3月13日周三 上午3:28写道：

> I would like to use vtkImageReslice to get the cross section of a curve at
> a
> point P0.
>
> To compute the reslixeAxes, I would like to use P0 and its neighboring
> point
> P1 to decisde the direction.
>
> As you know, resliceAxes is a vtkMatrix4x4. I think it should be somehting
> as:
>
> A, B, C, P0.x
> D, E, F,  P0.y
> G, H, I,  P0.z
> 0,  0, 0,   1
>
> Can anyone let me know how to compute the value of {A, B, ... I}  based on
> P0 and P1?
>
> Thank you!
>
>
>
>
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