# Is it possible to create a Model Node with 2 cylinders?

**URL:** <https://discourse.slicer.org/t/is-it-possible-to-create-a-model-node-with-2-cylinders/12002>\
**Category:** Development\
**Created:** [June 12, 2020, 4:26pm UTC](https://discourse.slicer.org/t/is-it-possible-to-create-a-model-node-with-2-cylinders/12002 "2020-06-12T16:26:59Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Pablo\_Javier](https://avatars.discourse-cdn.com/v4/letter/p/f04885/32.png) [@Pablo\_Javier](https://discourse.slicer.org/u/Pablo_Javier)\
**Post date:** [June 12, 2020, 4:26pm UTC](https://discourse.slicer.org/t/is-it-possible-to-create-a-model-node-with-2-cylinders/12002/1 "2020-06-12T16:26:59Z")

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I want to create a model node which includes two or more cylinders. Is that possible ?( I don´t want a node per cylinder)

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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:** [June 12, 2020, 4:29pm UTC](https://discourse.slicer.org/t/is-it-possible-to-create-a-model-node-with-2-cylinders/12002/2 "2020-06-12T16:29:29Z")

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Would you like to create a cylinder with a cylindrical hole in it? You can create that by appending output of vtkClyinderSources, with the internal polydata turned inside out using vtkReverseSense.

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**Author:** ![Pablo\_Javier](https://avatars.discourse-cdn.com/v4/letter/p/f04885/32.png) [@Pablo\_Javier](https://discourse.slicer.org/u/Pablo_Javier)\
**Post date:** [June 12, 2020, 4:46pm UTC](https://discourse.slicer.org/t/is-it-possible-to-create-a-model-node-with-2-cylinders/12002/3 "2020-06-12T16:46:16Z")

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I want to create 2 or more independent cylinders into a single Model node.

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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:** [June 12, 2020, 5:20pm UTC](https://discourse.slicer.org/t/is-it-possible-to-create-a-model-node-with-2-cylinders/12002/4 "2020-06-12T17:20:59Z")

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OK, then just append the output of the cylinder sources by using vtkAppendPolyData and set its output as input of the model node.

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**Author:** ![Pablo\_Javier](https://avatars.discourse-cdn.com/v4/letter/p/f04885/32.png) [@Pablo\_Javier](https://discourse.slicer.org/u/Pablo_Javier)\
**Post date:** [June 12, 2020, 11:09pm UTC](https://discourse.slicer.org/t/is-it-possible-to-create-a-model-node-with-2-cylinders/12002/5 "2020-06-12T23:09:50Z")

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Thank you so much! It worked!