# Defining and Connecting Manual Tie Points (MTPs)

**URL:** <https://community.pix4d.com/t/defining-and-connecting-manual-tie-points-mtps/19402>\
**Category:** PIX4Dmapper Questions/Troubleshooting\
**Created:** [August 19, 2021, 5:46pm UTC](https://community.pix4d.com/t/defining-and-connecting-manual-tie-points-mtps/19402 "2021-08-19T17:46:19Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![barbara.perrott](https://avatars.discourse-cdn.com/v4/letter/b/b2d939/32.png) [@barbara.perrott](https://community.pix4d.com/u/barbara.perrott)\
**Post date:** [August 19, 2021, 5:46pm UTC](https://community.pix4d.com/t/defining-and-connecting-manual-tie-points-mtps/19402/1 "2021-08-19T17:46:19Z")

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Hi Everyone,

I am attempting to create a base and fill my 3D texture mesh. I am referring to the documentation below, however the documentation is saying to add MTPs which have no xyz values and to connect them. It also says the MTPs should have the lowest altitude, but as they do not have xyz values, that doesn’t seem to make sense. I also can’t find any documentation on how to connect MTPs.

> **[Pix4D outputs for 3D printing](https://support.pix4d.com/hc/en-us/articles/202559649-Pix4D-outputs-for-3D-printing)**
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> Pix4D can generate a 3D textured mesh which can be exported in the following formats: .ply, .fbx, .dxf, .obj, .pdf. This 3D textured mesh can be imported into your preferred mesh editor or model ...

Any help would be greatly appreciated! Thanks!

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**Author:** ![Yuka](https://avatars.discourse-cdn.com/v4/letter/y/9d8465/32.png) [@Yuka](https://community.pix4d.com/u/Yuka)\
**Post date:** [August 26, 2021, 2:20am UTC](https://community.pix4d.com/t/defining-and-connecting-manual-tie-points-mtps/19402/2 "2021-08-26T02:20:36Z")

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I’m not sure I’m understanding your question correctly, but the articles below might be helpful. It explains how to create MTPs.

> **[How to add / import and mark manual tie points (MTPs) in the rayCloud](https://support.pix4d.com/hc/en-us/articles/202560349-How-to-add-import-and-mark-manual-tie-points-MTPs-in-the-rayCloud)**
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> Video: Watch the instructional video about manual tie points:
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> An automatic tie point (ATP) is a 3D point corresponding to a keypoint that is automatically detected and matched in the images.A...

> **[How to import and mark Manual Tie Points (MTPs)](https://support.pix4d.com/hc/en-us/articles/360000395103-How-to-import-and-mark-Manual-Tie-Points-MTPs)**
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> Video: Watch the instructional video about Manual Tie Points: here.
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> An Automatic Tie Point (ATP) is a 3D point corresponding to a keypoint that is automatically detected and matched in the imag...

Kind regards,