# Does vtkPolyDataMapper support back face property for points?

**URL:** https://discourse.vtk.org/t/does-vtkpolydatamapper-support-back-face-property-for-points/15092
**Category:** Support
**Created:** [December 30, 2024, 1:15pm UTC](https://discourse.vtk.org/t/does-vtkpolydatamapper-support-back-face-property-for-points/15092 "2024-12-30T13:15:55Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![hui](https://discourse.vtk.org/user_avatar/discourse.vtk.org/hui/32/9656_2.png) [@hui](https://discourse.vtk.org/u/hui)
#### Post date: [December 30, 2024, 1:15pm UTC](https://discourse.vtk.org/t/does-vtkpolydatamapper-support-back-face-property-for-points/15092/1 "2024-12-30T13:15:55Z")

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Hello,  
I use vtkPolyDataMapper to display a point cloud. Each point has its own normal. The problem is the back face of each point is always black even when I set the back face property with a different color for the actor. How to solve this?  
Thanks.