# Non-uniform rectilinear grid isses

**URL:** https://discourse.paraview.org/t/non-uniform-rectilinear-grid-isses/10722
**Category:** In Situ Support
**Tags:** catalyst
**Created:** [November 10, 2022, 7:50pm UTC](https://discourse.paraview.org/t/non-uniform-rectilinear-grid-isses/10722 "2022-11-10T19:50:14Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![Preslav](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/p/4bbf92/32.png) [@Preslav](https://discourse.paraview.org/u/Preslav)
#### Post date: [November 10, 2022, 7:50pm UTC](https://discourse.paraview.org/t/non-uniform-rectilinear-grid-isses/10722/1 "2022-11-10T19:50:14Z")

</div>

Hello,

I am trying to render a non-uniform rectilinear grid with catalyst.

The code I use to generate the grid is:

```auto
    mesh["coordsets/coords/type"] = "rectilinear";
    mesh["coordsets/coords/values/x"] = grid.g_x;
    mesh["coordsets/coords/values/y"] = grid.g_y;
    mesh["coordsets/coords/values/z"] = grid.g_z;
    mesh["topologies/mesh/coordset"] = "coords";
    mesh["topologies/mesh/type"] = "rectilinear";
    mesh["topologies/mesh/elements/origin/i"] = grid.g_x[0];
    mesh["topologies/mesh/elements/origin/j"] = grid.g_y[0];
    mesh["topologies/mesh/elements/origin/k"] = grid.g_z[0];

```

calling mesh[“coordsets/coords/values”].print(); gives the following:

```auto
{
  "x": 
  {
    "dtype":"float64",
    "number_of_elements": 31,
    "offset": 0,
    "stride": 8,
    "element_bytes": 8,
    "endianness": "little",
    "value": [0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0, 13.0, 14.0, 15.0, 16.0, 17.0, 18.0, 19.0, 20.0, 21.0, 22.0, 23.0, 24.0, 25.0, 26.0, 27.0, 28.0, 29.0, 30.0]
  },
  "y": 
  {
    "dtype":"float64",
    "number_of_elements": 8,
    "offset": 0,
    "stride": 8,
    "element_bytes": 8,
    "endianness": "little",
    "value": [-1.0, -0.6, 0.0, 1.0, 2.0, 3.0, 3.6, 4.0]
  },
  "z": 
  {
    "dtype":"float64",
    "number_of_elements": 8,
    "offset": 0,
    "stride": 8,
    "element_bytes": 8,
    "endianness": "little",
    "value": [-1.0, -0.6, 0.0, 1.0, 2.0, 3.0, 3.6, 4.0]
  }
}

```

This for some reason results in a uniform grid in Paraview, with an origin at {0,0,0}.

How can I properly render the non-uniform rectilinear grid?

The file I use for catalyst is the one from Lulesh:  
[savedata.py](https://discourse.paraview.org/uploads/short-url/ehtMW3roqjCvAKl2b5eYBa6A6FV.py) (578 Bytes)

Thanks in advance!

---

<div class="post-metadata">

### Author: ![dutta-alankar](https://discourse.paraview.org/user_avatar/discourse.paraview.org/dutta-alankar/32/13310_2.png) [@dutta-alankar](https://discourse.paraview.org/u/dutta-alankar)
#### Post date: [November 15, 2022, 4:22am UTC](https://discourse.paraview.org/t/non-uniform-rectilinear-grid-isses/10722/2 "2022-11-15T04:22:51Z")

</div>

Not entirely sure but your issue might be related to this. What version of ParaView are you using?

[Unexpected plot shown by ParaView Catalyst on using Rectilinear Conduit blueprint - In Situ Support - ParaView](https://discourse.paraview.org/t/unexpected-plot-shown-by-paraview-catalyst-on-using-rectilinear-conduit-blueprint/9852)