# How to add Sphere Source or other actors to Slicer Scene with UI

**URL:** <https://discourse.slicer.org/t/how-to-add-sphere-source-or-other-actors-to-slicer-scene-with-ui/26430>\
**Category:** Support\
**Created:** [November 25, 2022, 4:49am UTC](https://discourse.slicer.org/t/how-to-add-sphere-source-or-other-actors-to-slicer-scene-with-ui/26430 "2022-11-25T04:49:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![alireza](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/alireza/32/67173_2.png) [@alireza](https://discourse.slicer.org/u/alireza)\
**Post date:** [November 25, 2022, 4:49am UTC](https://discourse.slicer.org/t/how-to-add-sphere-source-or-other-actors-to-slicer-scene-with-ui/26430/1 "2022-11-25T04:49:57Z")

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Is there an easy way to add a sphere source (or polyLine) to slicer scene? I would like to try various rendering behaviours involving polyData and volume actors. First I thought I add a control point and increase its radius, but it seems like the radius has a maximum.

Is there any extension that let me create various actors from vtk and add them to the scene? or if there is written scripts somewhere I think that works as well.

Thanks

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/6/5/653fc3d3355ade18b2a76b7f16dace6bf769c64d.jpeg)

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [November 25, 2022, 6:20am UTC](https://discourse.slicer.org/t/how-to-add-sphere-source-or-other-actors-to-slicer-scene-with-ui/26430/2 "2022-11-25T06:20:29Z")

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The easiest way to display a polydata is by adding a model node. There are many examples in the script repository, such as [this](https://slicer.readthedocs.io/en/latest/developer_guide/script_repository.html#create-segmentation-from-a-model-node).

If you want to display many spheres of the same size or interactively move the sphere then markups could be used. Maybe slider in the GUI has a limited range, but programmatically you can set and size.