# 3D raster with 690 Million voxels, takes too long to open.

**URL:** https://discourse.paraview.org/t/3d-raster-with-690-million-voxels-takes-too-long-to-open/1630
**Category:** ParaView Support
**Created:** [April 9, 2019, 1:41am UTC](https://discourse.paraview.org/t/3d-raster-with-690-million-voxels-takes-too-long-to-open/1630 "2019-04-09T01:41:28Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![fanfan](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/f/45deac/32.png) [@fanfan](https://discourse.paraview.org/u/fanfan)
#### Post date: [April 9, 2019, 1:41am UTC](https://discourse.paraview.org/t/3d-raster-with-690-million-voxels-takes-too-long-to-open/1630/1 "2019-04-09T01:41:29Z")

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Hi,  
I created a VTK file with 690 million voxels using GRASS GIS (resolution 20 m x 20 m x 1 m over a 40 km x 40 km domain.  
After about 2 hrs of opening the file in paraview (opened VTK using Legacy VTK reader), paraview is still opening the file. I wonder if if there is a way to open 3D raster using another format that can handle large data sets? or should i export the model in smaller blocks?

Thks,

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### Author: ![Dave\_DeMarle](https://discourse.paraview.org/user_avatar/discourse.paraview.org/dave_demarle/32/27_2.png) [@Dave\_DeMarle](https://discourse.paraview.org/u/Dave_DeMarle)
#### Post date: [April 9, 2019, 1:44pm UTC](https://discourse.paraview.org/t/3d-raster-with-690-million-voxels-takes-too-long-to-open/1630/2 "2019-04-09T13:44:42Z")

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Question - is the VTK file ascii or binary mode? Binary should be a lot quicker that ascii, and consume a lot less space on disk.

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### Author: ![wascott](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/w/8e8cbc/32.png) [@wascott](https://discourse.paraview.org/u/wascott)
#### Post date: [April 9, 2019, 7:08pm UTC](https://discourse.paraview.org/t/3d-raster-with-690-million-voxels-takes-too-long-to-open/1630/3 "2019-04-09T19:08:35Z")

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Also, I would say that 690 million voxels is HUGE. This would be the biggest file read with the builtin server that I have ever heard about. Could you create a dataset that is 1/100th this big, and try opening that?

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### Author: ![fanfan](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/f/45deac/32.png) [@fanfan](https://discourse.paraview.org/u/fanfan)
#### Post date: [April 9, 2019, 10:54pm UTC](https://discourse.paraview.org/t/3d-raster-with-690-million-voxels-takes-too-long-to-open/1630/4 "2019-04-09T22:54:12Z")

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it can handle 10 million cells no pb.