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 # read\_size\_field

 Last update: 29.04.2026 

<a id="ansys.meshing.prime.FileIO.read_size_field"></a>

#### FileIO.read\_size\_field(file\_name, params)

Read a PyPrimeMesh size field (PSF and PSF.GZ) file from disk.

**Parameters:**

**file\_name**

Path to the size field file on disk.

**params**

Parameters for reading size field file.

**Returns:**

**[`SizeFieldFileReadResults`](ansys.meshing.prime.SizeFieldFileReadResults.md#ansys.meshing.prime.SizeFieldFileReadResults)**

Results from reading the size field file.

**Return type:**

[`SizeFieldFileReadResults`](ansys.meshing.prime.SizeFieldFileReadResults.md#ansys.meshing.prime.SizeFieldFileReadResults)

### Notes

This method does not support Unicode paths.

### Examples

```pycon
>>> file_io = prime.FileIO(model=model)
>>> params = prime.ReadSizeFieldParams(model=model)
>>> results = file_io.read_size_field("/tmp/my_prime_sizefield.psf", params)

```