# transparent objects not rendered with vtk9 and mesa 18.3.4 & 20.1.8

**URL:** https://discourse.vtk.org/t/transparent-objects-not-rendered-with-vtk9-and-mesa-18-3-4-20-1-8/4417
**Category:** Support
**Created:** [October 14, 2020, 9:51am UTC](https://discourse.vtk.org/t/transparent-objects-not-rendered-with-vtk9-and-mesa-18-3-4-20-1-8/4417 "2020-10-14T09:51:24Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![zandarina](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/z/4af34b/32.png) [@zandarina](https://discourse.vtk.org/u/zandarina)
#### Post date: [October 15, 2020, 9:20am UTC](https://discourse.vtk.org/t/transparent-objects-not-rendered-with-vtk9-and-mesa-18-3-4-20-1-8/4417/2 "2020-10-15T09:20:43Z")

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Hello, I don’t know about mesa, but I detected some errors in texture in vtk9. Check my post if it can help you

> [@vtkGPUVolumeRayCastMapper only consider the last label defined in a mask](https://discourse.vtk.org/t/vtkgpuvolumeraycastmapper-only-consider-the-last-label-defined-in-a-mask/4386/5):
>
> Hi thank you for answering. I would like to enable the transfer voxel for regions of the mask not intensity values. But it only allows me to define one label the second is ignored. To click one region for example make it red, to click + shift make it green. If I define only the red label it works if I define green and red it does not work. I wonder what it is the reason. Thanks I added the interpolation in my code.

If you define labels in a mask all the labels must be defined otherwise it fails. This is bug. But doing this, you can go around the problem.

Cheers

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