# Draw multiple tubes

**URL:** <https://discourse.slicer.org/t/draw-multiple-tubes/17507>\
**Category:** Support\
**Created:** [May 7, 2021, 1:36pm UTC](https://discourse.slicer.org/t/draw-multiple-tubes/17507 "2021-05-07T13:36:46Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Luca](https://avatars.discourse-cdn.com/v4/letter/l/51bf81/32.png) [@Luca](https://discourse.slicer.org/u/Luca)\
**Post date:** [May 7, 2021, 1:36pm UTC](https://discourse.slicer.org/t/draw-multiple-tubes/17507/1 "2021-05-07T13:36:46Z")

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Hi,

I am using Slicer 4.11.20210226 on Windows 10.  
Is it possible to use the “Draw tube” tool to define more than one tube on the same mask? As far as I tested, once seeds have been placed, the “apply” button creates a tube on the current segmentation but also erase the previous content. Is there any shortcut I miss?

Thank you in advance,  
Luca

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<div class="post-metadata">

**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:** [May 13, 2021, 4:56am UTC](https://discourse.slicer.org/t/draw-multiple-tubes/17507/2 "2021-05-13T04:56:53Z")

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You can draw any number of tubes, each in a new segment. In the end you can combine them, for example by using Logical operators effect:

- set Operation → Fill
- set Bypass masking → disabled
- set Masking (at the bottom) / Editable area → Inside all segments
- click Apply