# render only what's visible
**URL:** https://discourse.paraview.org/t/render-only-whats-visible/4121
**Category:** ParaView Support
**Created:** [April 20, 2020, 9:28am UTC](https://discourse.paraview.org/t/render-only-whats-visible/4121 "2020-04-20T09:28:15Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@marios\_geo](https://discourse.paraview.org/u/marios_geo)
#### Post date: [April 20, 2020, 9:28am UTC](https://discourse.paraview.org/t/render-only-whats-visible/4121/1 "2020-04-20T09:28:15Z")
Hi all,
I am visualizing large 3d gridded data using paraview. AFAIK, all voxels are rendered, independent if the user can see them or not. In other words, if i have a “big” cube that consist of 3x3 smaller cubes, the center one should not be rendered, unless user decide to slice the data.
Is something like that possible?
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [April 20, 2020, 9:29am UTC](https://discourse.paraview.org/t/render-only-whats-visible/4121/2 "2020-04-20T09:29:49Z")
This depends of the representation in use, but considering you are using “Surface Representation”, then this is incorrect, only the surface is rendered.
---
### Author:  [@marios\_geo](https://discourse.paraview.org/u/marios_geo)
#### Post date: [April 20, 2020, 9:39am UTC](https://discourse.paraview.org/t/render-only-whats-visible/4121/3 "2020-04-20T09:39:12Z")
Thanks for the reply. Then, is there any limit on how many voxels I can visualize?
I have a 3000x2000x50 matrix. When I generate a vtk file with the voxels, paraview is crashing (after few minutes of loading), without error message.
If I generate 5 vtk files of 3000x2000x10 each, I can load 1-by-1, but not all of them in one go.
I do use the surface render.
Thanks again.
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [April 20, 2020, 9:42am UTC](https://discourse.paraview.org/t/render-only-whats-visible/4121/4 "2020-04-20T09:42:07Z")
Are you running out of memory ?
---
### Author:  [@marios\_geo](https://discourse.paraview.org/u/marios_geo)
#### Post date: [April 20, 2020, 9:49am UTC](https://discourse.paraview.org/t/render-only-whats-visible/4121/5 "2020-04-20T09:49:34Z")
I do not know. I have 32gb ram, but I do not see any error message.
How can I check?
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [April 20, 2020, 9:54am UTC](https://discourse.paraview.org/t/render-only-whats-visible/4121/6 "2020-04-20T09:54:46Z")
Are you using Windows, Mac or Linux ?
---
### Author:  [@marios\_geo](https://discourse.paraview.org/u/marios_geo)
#### Post date: [April 20, 2020, 10:07am UTC](https://discourse.paraview.org/t/render-only-whats-visible/4121/7 "2020-04-20T10:07:01Z")
windows 10. With Paraview 5.7 and a quadro 1000M GPU.
A sample of the model I am trying is here
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [April 20, 2020, 10:51am UTC](https://discourse.paraview.org/t/render-only-whats-visible/4121/8 "2020-04-20T10:51:30Z")
- Ctrl-Alt-Del
- Performance Tab
- You can then monitor you RAM and GPU Memory while loading the model.