<p>I figured it out. You have to apply the mask and background with a merge node after the original composite using the tracking data like this:</p>
<p><a href="https://i.sstatic.net/QtK4B.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/QtK4B.jpg" alt="Solution image" /></a></p>

CC BY-SA 4.0
2021-06-10T08:40:09.420Z
2021-06-10T08:40:09.420Z
Peter
<p>I'm having problems trying to apply a polygon mask to a planar tracking media which is UHD. My project is HD and my background image (the building) is also UHD. My tracking window and mask look like this:</p>
<p><a href="https://i.sstatic.net/u6MeX.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/u6MeX.jpg" alt="Fusion mask and planar tracker" /></a></p>
<p>Then when I attach the polygon mask it gets scaled like this:</p>
<p><a href="https://i.sstatic.net/fuLN8.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/fuLN8.jpg" alt="Fusion mask and planar tracker squashed" /></a></p>
<p>How can I resize the media or the mask so it fits my background?</p>

<davinci-resolve><mask><fusion>
Davinci Fusion Planar tracking, effect mask distorted size
Peter
# Davinci Fusion Planar tracking, effect mask distorted size

(Asked by: username_0 on 2021-06-02)

I'm having problems trying to apply a polygon mask to a planar tracking media which is UHD. My project is HD and my background image (the building) is also UHD. My tracking window and mask look like this:

[![Fusion mask and planar tracker](https://i.sstatic.net/u6MeX.jpg)](https://i.sstatic.net/u6MeX.jpg)

Then when I attach the polygon mask it gets scaled like this:

[![Fusion mask and planar tracker squashed](https://i.sstatic.net/fuLN8.jpg)](https://i.sstatic.net/fuLN8.jpg)

How can I resize the media or the mask so it fits my background?

**Tags:** davinci-resolve, mask, fusion


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## 1 answers

### Answer by username_0 on 2021-06-10. Score: 0 | Accepted answer

I figured it out. You have to apply the mask and background with a merge node after the original composite using the tracking data like this:

[![Solution image](https://i.sstatic.net/QtK4B.jpg)](https://i.sstatic.net/QtK4B.jpg)


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