# Use of pmatrix.txt for  conversion of 3D coordinates (X,Y,Z) of a 3D point into 2D coordinates (u,v) of an undistorted image

**URL:** <https://community.pix4d.com/t/use-of-pmatrix-txt-for-conversion-of-3d-coordinates-x-y-z-of-a-3d-point-into-2d-coordinates-u-v-of-an-undistorted-image/5528>\
**Category:** PIX4Dmapper Questions/Troubleshooting\
**Created:** [July 28, 2016, 3:40pm UTC](https://community.pix4d.com/t/use-of-pmatrix-txt-for-conversion-of-3d-coordinates-x-y-z-of-a-3d-point-into-2d-coordinates-u-v-of-an-undistorted-image/5528 "2016-07-28T15:40:39Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Antigoni\_Makri](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/antigoni_makri/32/187_2.png) [@Antigoni\_Makri](https://community.pix4d.com/u/Antigoni_Makri)\
**Post date:** [April 12, 2018, 8:42am UTC](https://community.pix4d.com/t/use-of-pmatrix-txt-for-conversion-of-3d-coordinates-x-y-z-of-a-3d-point-into-2d-coordinates-u-v-of-an-undistorted-image/5528/2 "2018-04-12T08:42:06Z")

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Hello Mark,

We have some news regarding the pmatrix file. You can find&nbsp;the updates&nbsp;in the following [post](https://community.pix4d.com/t/6012-Matching-pixels-in-orthomosaic-to-corresponding-pixels-in-undistorted-input-images?page=1#community_comment_360000363226).  
Feel free to add your comments there.

Please allow me to close this post so that all the&nbsp;feedback regarding the pmatrix file is&nbsp;gathered&nbsp;on the other post.

Regards,

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_[View the full topic](https://community.pix4d.com/t/use-of-pmatrix-txt-for-conversion-of-3d-coordinates-x-y-z-of-a-3d-point-into-2d-coordinates-u-v-of-an-undistorted-image/5528)._