# VTK\_POLY\_VERTEX rendering issue

**URL:** <https://discourse.vtk.org/t/vtk-poly-vertex-rendering-issue/16572>\
**Category:** Support\
**Created:** [October 28, 2026, 1:26am UTC](https://discourse.vtk.org/t/vtk-poly-vertex-rendering-issue/16572 "2026-10-28T01:26:50Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![PeterFranzSeequent](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/p/b5a626/32.png) [@PeterFranzSeequent](https://discourse.vtk.org/u/PeterFranzSeequent)\
**Post date:** [October 28, 2026, 1:26am UTC](https://discourse.vtk.org/t/vtk-poly-vertex-rendering-issue/16572/1 "2026-10-28T01:26:50Z")

</div>

I have a rendering issue with VTK\_POLY\_VERTEX cells. In my situation the vertex cells have enlarged point sizes, set via `Actor->GetProperty()->SetPointSize(14).`

The vertex cells are placed inside a box mesh, i.e. they are completely enclosed in the mesh. However, under certain camera angles the vertex cells shine through the box. How can I control this, i.e. where in the renderer/actor/mapping settings can I switch this behaviour off?

Here’s an example with 3 polyvertex cells shining through - one fully, two partially.

 ![image](https://discourse.vtk.org/uploads/default/original/2X/c/cca84ff9aafdd6a346bb81e73204f44d908de2a7.png)