# vtkPolyData rendered upside down and reversed, why?

**URL:** https://discourse.vtk.org/t/vtkpolydata-rendered-upside-down-and-reversed-why/6550
**Category:** Support
**Created:** [September 3, 2021, 9:18pm UTC](https://discourse.vtk.org/t/vtkpolydata-rendered-upside-down-and-reversed-why/6550 "2021-09-03T21:18:36Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![Paulo\_Carvalho](https://discourse.vtk.org/user_avatar/discourse.vtk.org/paulo_carvalho/32/370_2.png) [@Paulo\_Carvalho](https://discourse.vtk.org/u/Paulo_Carvalho)
#### Post date: [September 4, 2021, 2:30pm UTC](https://discourse.vtk.org/t/vtkpolydata-rendered-upside-down-and-reversed-why/6550/2 "2021-09-04T14:30:02Z")

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Hello,

It seems that the handedness (3D rendering can be right- or left-handed) of your scene is not what you expected. Please, take a look at this: [Change coordinate system from right to left-handed (change direction of Z axis)](https://discourse.vtk.org/t/change-coordinate-system-from-right-to-left-handed-change-direction-of-z-axis/4635).

I hope this helps,

Paulo

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