# How can I draw a particle with an exact diameter?

**URL:** https://discourse.paraview.org/t/how-can-i-draw-a-particle-with-an-exact-diameter/12574
**Category:** ParaView Support
**Created:** [July 24, 2023, 3:09pm UTC](https://discourse.paraview.org/t/how-can-i-draw-a-particle-with-an-exact-diameter/12574 "2023-07-24T15:09:45Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![unknown\_family\_name](https://discourse.paraview.org/user_avatar/discourse.paraview.org/unknown_family_name/32/12007_2.png) [@unknown\_family\_name](https://discourse.paraview.org/u/unknown_family_name)
#### Post date: [July 24, 2023, 3:09pm UTC](https://discourse.paraview.org/t/how-can-i-draw-a-particle-with-an-exact-diameter/12574/1 "2023-07-24T15:09:46Z")

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As far as I know, using the point Gaussian method is the best way to draw a particle with its correct diameter.

I have found information about this method at the following  
URL: [https://www.kitware.com/paraview-5-introducing-the-point-gaussian-representation/](https://www.kitware.com/paraview-5-introducing-the-point-gaussian-representation/)

However, my PARAVIEW (version 5.10.1 for Ubuntu) does not seem to support editing the “Scale transfer function” as explained in the above URL.

 ![Screenshot 2023-07-24 at 11.54.12 PM](https://discourse.paraview.org/uploads/default/original/2X/c/c8b0a45399350a5a784bfc0cc0b92f6f59d416b8.png)  
 ![Screenshot 2023-07-24 at 11.54.20 PM](https://discourse.paraview.org/uploads/default/original/2X/6/6ead65e2f7ad7be171dcfe2bc17d2716aad6808d.png)

In my vtk data, a total of 10 spheres with a diameter range from 0.0005 to 0.0014 are generated, as shown in the figure.

 ![Screenshot 2023-07-24 at 11.48.58 PM](https://discourse.paraview.org/uploads/default/original/2X/e/ea8bbc839b321e1708f3a5dd7a6eeab4cd4dd45e.png)

As I understand it, the Gaussian Radius should be set to the maximum radius of the spheres, and the Scale Transfer function should be adjusted to represent the maximum radius as 1.0.

 ![Screenshot 2023-07-24 at 11.55.02 PM](https://discourse.paraview.org/uploads/default/original/2X/a/ac6f8bd372f9e70a4f8afc66c39ca2621947aa47.png)

However, in the “EDIT” window of the scale transfer function, the range is limited to 0.001 to 0.001. Additionally, the value can only be adjusted by mouse dragging, not by typing in a specific number.

Please let me know if I am misunderstanding the use of the point Gaussian method.

Regards.

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<div class="post-metadata">

### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [July 24, 2023, 3:21pm UTC](https://discourse.paraview.org/t/how-can-i-draw-a-particle-with-an-exact-diameter/12574/2 "2023-07-24T15:21:04Z")

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> [@unknown\_family\_name](#):
>
> the range is limited to 0.001 to 0.001.

The range should be set outside, just below the edit button.

> Additionally, the value can only be adjusted by mouse dragging, not by typing in a specific number.

Correct, this is a missing feature.