# Connecting two or more volumes

**URL:** <https://discourse.slicer.org/t/connecting-two-or-more-volumes/9922>\
**Category:** Development\
**Created:** [January 23, 2020, 3:56pm UTC](https://discourse.slicer.org/t/connecting-two-or-more-volumes/9922 "2020-01-23T15:56:44Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![tkt8](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/tkt8/32/5758_2.png) [@tkt8](https://discourse.slicer.org/u/tkt8)\
**Post date:** [January 23, 2020, 3:56pm UTC](https://discourse.slicer.org/t/connecting-two-or-more-volumes/9922/1 "2020-01-23T15:56:44Z")

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I am developing an extension for slicer. I wanted to compare the original volume and the modified volume. Is there a way to link the two so that I can mimic the action such as say segmentation done in original volume is reflected in the new volume so that i can compare them side by side.  
Thanks

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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:** [January 28, 2020, 4:45am UTC](https://discourse.slicer.org/t/connecting-two-or-more-volumes/9922/2 "2020-01-28T04:45:43Z")

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Sorry for the late answer, many of us very very busy at the Slicer project week last week.

> [@tkt8](#):
>
> I wanted to compare the original volume and the modified volume

Would you like to just show the two volumes side-by-side and pan/zoom them in sync? You can do that by enabling hot-link by long-click on the slice view link icon.

> [@tkt8](#):
>
> Is there a way to link the two so that I can mimic the action such as say segmentation done in original volume is reflected in the new volume

The two volume nodes and the segmentation node are three separate nodes. Would you like to just show the same segmentation over two different volumes?

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**Author:** ![tkt8](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/tkt8/32/5758_2.png) [@tkt8](https://discourse.slicer.org/u/tkt8)\
**Post date:** [February 4, 2020, 4:13pm UTC](https://discourse.slicer.org/t/connecting-two-or-more-volumes/9922/3 "2020-02-04T16:13:53Z")

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Thanks for help. Yes I would like to show the same segmentation over 2 or more different volumes

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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:** [February 4, 2020, 4:35pm UTC](https://discourse.slicer.org/t/connecting-two-or-more-volumes/9922/4 "2020-02-04T16:35:07Z")

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Segmentations are shown by default in all views. To show different volumes in each slice view, click the push-pin icon in the top-left corner of the slice view then choose a volume to be shown in that view by using the node selector on the right. See more details in the [Data loading and visualization tutorial](https://www.slicer.org/wiki/Documentation/Nightly/Training#Slicer4_Data_Loading_and_3D_Visualization).

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**Author:** ![tkt8](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/tkt8/32/5758_2.png) [@tkt8](https://discourse.slicer.org/u/tkt8)\
**Post date:** [February 26, 2020, 5:26pm UTC](https://discourse.slicer.org/t/connecting-two-or-more-volumes/9922/5 "2020-02-26T17:26:47Z")

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I want to have the same segmentation in two different volumes. Is there a way to do this?

Thanks

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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:** [February 26, 2020, 6:07pm UTC](https://discourse.slicer.org/t/connecting-two-or-more-volumes/9922/6 "2020-02-26T18:07:51Z")

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Segmentation nodes are independent from volume nodes, so they are not “in volumes”. You can export segmentations to labelmap volumes that match geometry (origin, spacing, axis directions, extents) of an existing volume using Segmentations module, Import/Export section. Choose the reference volume to be the volume that you want to match the geometry of.

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**Author:** ![tkt8](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/tkt8/32/5758_2.png) [@tkt8](https://discourse.slicer.org/u/tkt8)\
**Post date:** [February 28, 2020, 1:10pm UTC](https://discourse.slicer.org/t/connecting-two-or-more-volumes/9922/7 "2020-02-28T13:10:52Z")

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Thank you for helping me. Is there a tutorial I can follow for this?

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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:** [February 28, 2020, 4:38pm UTC](https://discourse.slicer.org/t/connecting-two-or-more-volumes/9922/8 "2020-02-28T16:38:01Z")

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You can find segmentation tutorials here: [https://www.slicer.org/wiki/Documentation/Nightly/Training#Segmentation](https://www.slicer.org/wiki/Documentation/Nightly/Training#Segmentation)