# Increasing ALPACA Non-Rigid Alignment

**URL:** <https://discourse.slicer.org/t/increasing-alpaca-non-rigid-alignment/28906>\
**Category:** Support\
**Tags:** registration\
**Created:** [April 14, 2023, 10:11am UTC](https://discourse.slicer.org/t/increasing-alpaca-non-rigid-alignment/28906 "2023-04-14T10:11:27Z")\
**Posts on this page:** 1\
**Showing post:** 13

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**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [April 24, 2023, 9:51pm UTC](https://discourse.slicer.org/t/increasing-alpaca-non-rigid-alignment/28906/13 "2023-04-24T21:51:35Z")

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> [@evaherbst](#):
>
> I definitely misunderstood this method, I thought the whole mesh deformation was part of the process to transfer the landmarks.

Yes, ALPACA is for transferring landmarks, and the deformation is calculated using reduced point clouds since it is very fast and offers enough accuracy. We will clarify the documentation to explain that visualization is only an approximation and limited to the points selected.

> [@evaherbst](#):
>
> _If it is really important for you to get a complete deformation of the mesh, it is somewhat straightforward to modify ALPACA to do it. I am happy to chat about how this can be accomplished using the machinery of the module._

We had been talking about having a separate mesh registration framework build on point clouds, but not sure what the timing of it would be. If @agporto and you are interested in workign together, we can schedule a meeting.

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_[View the full topic](https://discourse.slicer.org/t/increasing-alpaca-non-rigid-alignment/28906)._