# about camera

**URL:** https://discourse.vtk.org/t/about-camera/11403
**Category:** Web
**Created:** [May 8, 2023, 7:10am UTC](https://discourse.vtk.org/t/about-camera/11403 "2023-05-08T07:10:58Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![d\_a](https://discourse.vtk.org/user_avatar/discourse.vtk.org/d_a/32/6825_2.png) [@d\_a](https://discourse.vtk.org/u/d_a)
#### Post date: [May 8, 2023, 7:10am UTC](https://discourse.vtk.org/t/about-camera/11403/1 "2023-05-08T07:10:58Z")

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I want to get the row cosine and column cosine I want through the two methods of camera.getViewUp() and camera.getViewPlaneNormal(). Then calculate the direction of the slice in MPR. When I change or rotate the slice, the value obtained by the camera.getViewPlaneNormal() method changes in real time, but the camera.getViewUp() method does not change. What is the reason?