# Positioning models

**URL:** <https://discourse.slicer.org/t/positioning-models/12184>\
**Category:** Support\
**Created:** [June 23, 2020, 7:14pm UTC](https://discourse.slicer.org/t/positioning-models/12184 "2020-06-23T19:14:22Z")\
**Posts on this page:** 11\
**Page:** 1

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**Author:** ![Rodrigo\_Visconti](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/rodrigo_visconti/32/3436_2.png) [@Rodrigo\_Visconti](https://discourse.slicer.org/u/Rodrigo_Visconti)\
**Post date:** [June 23, 2020, 7:14pm UTC](https://discourse.slicer.org/t/positioning-models/12184/1 "2020-06-23T19:14:22Z")

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Please tell me how can I position a preprogrammed model in my segmentation easily. I’m having trouble doing it. 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:** [June 23, 2020, 8:16pm UTC](https://discourse.slicer.org/t/positioning-models/12184/2 "2020-06-23T20:16:00Z")

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What do you mean by a “preprogrammed model”?

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**Author:** ![Rodrigo\_Visconti](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/rodrigo_visconti/32/3436_2.png) [@Rodrigo\_Visconti](https://discourse.slicer.org/u/Rodrigo_Visconti)\
**Post date:** [June 23, 2020, 8:33pm UTC](https://discourse.slicer.org/t/positioning-models/12184/3 "2020-06-23T20:33:48Z")

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I mean a model to make the border of my segmentation to fit into other printed piece. I made a support for my printed valves and I need to align them. The border has this meaning.

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**Author:** ![Rodrigo\_Visconti](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/rodrigo_visconti/32/3436_2.png) [@Rodrigo\_Visconti](https://discourse.slicer.org/u/Rodrigo_Visconti)\
**Post date:** [June 23, 2020, 8:36pm UTC](https://discourse.slicer.org/t/positioning-models/12184/4 "2020-06-23T20:36:12Z")

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This border is in stl format.

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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 23, 2020, 9:23pm UTC](https://discourse.slicer.org/t/positioning-models/12184/5 "2020-06-23T21:23:46Z")

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Can you post screenshots or some other illustrations of what you want to achieve?

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**Author:** ![Rodrigo\_Visconti](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/rodrigo_visconti/32/3436_2.png) [@Rodrigo\_Visconti](https://discourse.slicer.org/u/Rodrigo_Visconti)\
**Post date:** [June 23, 2020, 9:38pm UTC](https://discourse.slicer.org/t/positioning-models/12184/6 "2020-06-23T21:38:12Z")

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![20200623_183412](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/6/b63d815dda14df99f3670bee0f64b30128aa88d5.jpeg)  
The grey is the model I want to compare and the brown is the segmentation how to align both? I’m trying with transforms but I’m losing much time with it

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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 23, 2020, 9:50pm UTC](https://discourse.slicer.org/t/positioning-models/12184/7 "2020-06-23T21:50:07Z")

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Visual alignment of 3D shapes on a 2D screen is very inaccurate and time-consuming.

For your case, a much better and faster registration method is marking corresponding points on the objects and computing transform using Fiducial Registration Wizard module (in SlicerIGT extension).

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**Author:** ![Rodrigo\_Visconti](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/rodrigo_visconti/32/3436_2.png) [@Rodrigo\_Visconti](https://discourse.slicer.org/u/Rodrigo_Visconti)\
**Post date:** [June 23, 2020, 10:05pm UTC](https://discourse.slicer.org/t/positioning-models/12184/8 "2020-06-23T22:05:37Z")

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Thanks. Do you have any tutorial about this issue?

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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 26, 2020, 1:58am UTC](https://discourse.slicer.org/t/positioning-models/12184/9 "2020-06-26T01:58:52Z")

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I’ve created a short video that shows how to use Fiducial registration wizard:

[![](https://img.youtube.com/vi/TBHr2wizGTM/maxresdefault.jpg "Align 3D objects using landmarks in 3D Slicer") ](https://www.youtube.com/watch?v=TBHr2wizGTM)

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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 26, 2020, 3:28pm UTC](https://discourse.slicer.org/t/positioning-models/12184/10 "2020-06-26T15:28:09Z")

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A post was merged into an existing topic: [Leaflet mold generator](https://discourse.slicer.org/t/leaflet-mold-generator/8696/18)

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**Author:** ![Rodrigo\_Visconti](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/rodrigo_visconti/32/3436_2.png) [@Rodrigo\_Visconti](https://discourse.slicer.org/u/Rodrigo_Visconti)\
**Post date:** [June 29, 2020, 2:47am UTC](https://discourse.slicer.org/t/positioning-models/12184/11 "2020-06-29T02:47:30Z")

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Thanks. Much easier and very helpful