# Visualize BRAINS control points

**URL:** <https://discourse.slicer.org/t/visualize-brains-control-points/2359>\
**Category:** Support\
**Tags:** registration\
**Created:** [March 19, 2018, 12:37pm UTC](https://discourse.slicer.org/t/visualize-brains-control-points/2359 "2018-03-19T12:37:07Z")\
**Posts on this page:** 13\
**Page:** 1

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**Author:** ![hadasara](https://avatars.discourse-cdn.com/v4/letter/h/c67d28/32.png) [@hadasara](https://discourse.slicer.org/u/hadasara)\
**Post date:** [March 19, 2018, 12:37pm UTC](https://discourse.slicer.org/t/visualize-brains-control-points/2359/1 "2018-03-19T12:37:07Z")

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Hi, I’m new in 3dslicer.  
I would like to know if and how I can see the control points in BRAINS non-rigid B-spline registration. Where they are located in my images, and where the locked points are located. I think that looking at the transformation at Transforms shows the interpolated grid on the entire image, isn’t it?  
(I’m using v4.8.1)

Thanks!  
Hadas.

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**Author:** ![timeanddoctor](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/timeanddoctor/32/5839_2.png) [@timeanddoctor](https://discourse.slicer.org/u/timeanddoctor)\
**Post date:** [March 19, 2018, 1:45pm UTC](https://discourse.slicer.org/t/visualize-brains-control-points/2359/2 "2018-03-19T13:45:51Z")

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of course you can do that in slicer.

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**Author:** ![hadasara](https://avatars.discourse-cdn.com/v4/letter/h/c67d28/32.png) [@hadasara](https://discourse.slicer.org/u/hadasara)\
**Post date:** [March 19, 2018, 1:48pm UTC](https://discourse.slicer.org/t/visualize-brains-control-points/2359/3 "2018-03-19T13:48:04Z")

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Great! Can you tell me how please? 🙂

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**Author:** ![timeanddoctor](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/timeanddoctor/32/5839_2.png) [@timeanddoctor](https://discourse.slicer.org/u/timeanddoctor)\
**Post date:** [March 19, 2018, 1:51pm UTC](https://discourse.slicer.org/t/visualize-brains-control-points/2359/4 "2018-03-19T13:51:59Z")

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ok. I opened my slicer while I cannot do that for you now since just a old one slicer4.3.  
Can you snap a pictrue from you computer under transform module.

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**Author:** ![timeanddoctor](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/timeanddoctor/32/5839_2.png) [@timeanddoctor](https://discourse.slicer.org/u/timeanddoctor)\
**Post date:** [March 19, 2018, 1:52pm UTC](https://discourse.slicer.org/t/visualize-brains-control-points/2359/5 "2018-03-19T13:52:39Z")

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![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/4/5/45d4b77da6a9fdca8ea4d09259ca4bd25519bab6.png)

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**Author:** ![hadasara](https://avatars.discourse-cdn.com/v4/letter/h/c67d28/32.png) [@hadasara](https://discourse.slicer.org/u/hadasara)\
**Post date:** [March 19, 2018, 2:00pm UTC](https://discourse.slicer.org/t/visualize-brains-control-points/2359/7 "2018-03-19T14:00:54Z")

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![Capture](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/8/7/87b48f531a14b9c5660483f231d6f8b937ebb7bc.jpeg)

Here, I want to know were were my “green” and “red” points, as they are shown in the FAQ explanations

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**Author:** ![hadasara](https://avatars.discourse-cdn.com/v4/letter/h/c67d28/32.png) [@hadasara](https://discourse.slicer.org/u/hadasara)\
**Post date:** [March 19, 2018, 2:06pm UTC](https://discourse.slicer.org/t/visualize-brains-control-points/2359/8 "2018-03-19T14:06:21Z")

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![Capture2](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/a/b/abde7aeeb195c7b4ecc50cc9317157409dae2ce3.jpeg)

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**Author:** ![timeanddoctor](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/timeanddoctor/32/5839_2.png) [@timeanddoctor](https://discourse.slicer.org/u/timeanddoctor)\
**Post date:** [March 19, 2018, 2:07pm UTC](https://discourse.slicer.org/t/visualize-brains-control-points/2359/9 "2018-03-19T14:07:58Z")

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hoom.  
what I think is you want transform in 3D by lick mouse, and I advise you open the selection “Visible in 3D view”.

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**Author:** ![hadasara](https://avatars.discourse-cdn.com/v4/letter/h/c67d28/32.png) [@hadasara](https://discourse.slicer.org/u/hadasara)\
**Post date:** [March 19, 2018, 2:13pm UTC](https://discourse.slicer.org/t/visualize-brains-control-points/2359/10 "2018-03-19T14:13:47Z")

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Thanks so much for trying to help me. I did select visible in 3d, but this was not so helpful. I turned on the view original grid, and what Im looking for is which points were the moving points, that afterwards, the rest of the images was interpolated to them. here- like blue points that I draw, just a s a symbole. Since grid size is 12 12 12, there should be 12x12x12 points (as far as I understand how this works)

![Capture3](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/5/1/511316b9f99b9975dd83aed2e2c2f4e0d0d22339.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:** [March 19, 2018, 2:14pm UTC](https://discourse.slicer.org/t/visualize-brains-control-points/2359/11 "2018-03-19T14:14:22Z")

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Transform visualization does not deal with internal details of transforms. If you want to see the control points, probably the easiest is to write a few-line Python script that places a markup fiducial at each control point (you can compute it from the B-spline grid size, origin, spacing, and orientation). You can then apply the transform to these markups to see the transformed points.

If you use thin-plate-spline transform instead of b-spline then you can also edit transforms in real-time by drag-and-dropping the markup fiducial points (using SlicerIGT extension’s Fiducial registration wizard module).

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<div class="post-metadata">

**Author:** ![hadasara](https://avatars.discourse-cdn.com/v4/letter/h/c67d28/32.png) [@hadasara](https://discourse.slicer.org/u/hadasara)\
**Post date:** [March 19, 2018, 2:15pm UTC](https://discourse.slicer.org/t/visualize-brains-control-points/2359/12 "2018-03-19T14:15:17Z")

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Ok, Thanks so much!! 🙂 this is supper helpful.

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<div class="post-metadata">

**Author:** ![hadasara](https://avatars.discourse-cdn.com/v4/letter/h/c67d28/32.png) [@hadasara](https://discourse.slicer.org/u/hadasara)\
**Post date:** [March 19, 2018, 7:53pm UTC](https://discourse.slicer.org/t/visualize-brains-control-points/2359/13 "2018-03-19T19:53:30Z")

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@lassoan Thanks again! So, I don’t know if this is a legit request, so just say what you think. Would it be possible for you to write how to create the markup fiducials and how to display it ? If it’s not too much to ask.

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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:** [July 9, 2018, 4:57pm UTC](https://discourse.slicer.org/t/visualize-brains-control-points/2359/14 "2018-07-09T16:57:38Z")

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A post was split to a new topic: [Setting b-spline grid size](https://discourse.slicer.org/t/setting-b-spline-grid-size/3434)