# Problem with parallel rendering with raytracing and opacity

**URL:** https://discourse.paraview.org/t/problem-with-parallel-rendering-with-raytracing-and-opacity/2834
**Category:** ParaView Support
**Created:** [October 24, 2019, 10:11am UTC](https://discourse.paraview.org/t/problem-with-parallel-rendering-with-raytracing-and-opacity/2834 "2019-10-24T10:11:29Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![gilcu2](https://discourse.paraview.org/user_avatar/discourse.paraview.org/gilcu2/32/2183_2.png) [@gilcu2](https://discourse.paraview.org/u/gilcu2)
#### Post date: [October 24, 2019, 10:11am UTC](https://discourse.paraview.org/t/problem-with-parallel-rendering-with-raytracing-and-opacity/2834/1 "2019-10-24T10:11:29Z")

</div>

I am running in parallel with mpiexec -np 4 pvserver and connect pv to it.  
If opacity\<1 without raytracing works ok.  
If opacity=1 with raytracing it is ok.  
if opacity\<1 and raytracing some overlapped composition is obtained.  
The images for each case are attached.  
Thanks

 ![transparent_noraytracing](https://discourse.paraview.org/uploads/default/original/2X/a/a4153ee7cead36c5e52708e382b7e953cfa2c3a2.jpeg) ![notransparent_raytracing](https://discourse.paraview.org/uploads/default/original/2X/9/90e55b04794adeaccb3d3a584c093ddc19cbbf7b.jpeg) ![transparent_raytracing](https://discourse.paraview.org/uploads/default/original/2X/8/8bc10cb9bf4bfd04b9502a30c11bb6bbcc80d567.jpeg)