# Z-Buffer Values Problem with Camera
**URL:** https://discourse.vtk.org/t/z-buffer-values-problem-with-camera/2224
**Category:** Support
**Created:** [December 6, 2019, 12:02pm UTC](https://discourse.vtk.org/t/z-buffer-values-problem-with-camera/2224 "2019-12-06T12:02:47Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Alex1](https://discourse.vtk.org/u/Alex1)
#### Post date: [December 6, 2019, 12:02pm UTC](https://discourse.vtk.org/t/z-buffer-values-problem-with-camera/2224/1 "2019-12-06T12:02:47Z")
Hi all,
I try to get the zBuffer Values from my vtkRenderWindow with renWin-\>GetZbufferData(x1,y1,x2,y2) and it works fine, if I print the Image to file I get this :
But as soon as I add a Camera to my renderer it doesnt work anymore and I get this as result: 
Can someone help me?
I used this example [https://vtk.org/Wiki/VTK/Examples/Cxx/Utilities/ZBuffer](https://vtk.org/Wiki/VTK/Examples/Cxx/Utilities/ZBuffer)
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### Author:  [@Michael](https://discourse.vtk.org/u/Michael)
#### Post date: [December 6, 2019, 2:47pm UTC](https://discourse.vtk.org/t/z-buffer-values-problem-with-camera/2224/2 "2019-12-06T14:47:30Z")
Hi,
This is an issue with the near/far plane of your camera.
Try to call `vtkRenderer::ResetCameraClippingRange()`
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### Author:  [@Alex1](https://discourse.vtk.org/u/Alex1)
#### Post date: [December 6, 2019, 3:14pm UTC](https://discourse.vtk.org/t/z-buffer-values-problem-with-camera/2224/3 "2019-12-06T15:14:21Z")
Hi,
still the same Problem even if I use `vtkRenderer::ResetCameraClippingRange()`
I have the following Setup:
`camera->SetPosition(x, y, z);`
`renderer->SetActiveCamera(camera);`
`renderer->ResetCameraClippingRange();`
Any idea?
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### Author:  [@Alex1](https://discourse.vtk.org/u/Alex1)
#### Post date: [December 11, 2019, 12:26pm UTC](https://discourse.vtk.org/t/z-buffer-values-problem-with-camera/2224/4 "2019-12-11T12:26:45Z")
I found a solution:
The camera position must be after renderWindow-\> Render (); has been called.