> For the complete documentation index, see [llms.txt](https://docs.v-nova.com/technologies/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.v-nova.com/technologies/v-nova.presenz/v-nova-presenz-documentation/underscan.md).
# Underscan
**Closer = more defined = more points**
In V-Nova PresenZ, the amount of data collected for a surface depends on the surface’s distance from the ZOV. The closer a surface is to the ZOV, the more points are needed to represent it accurately in the rendered image. Therefore, the point density will be higher for closer surfaces compared to surfaces further away. Which is generally desirable.
**When Underscanning is needed**
But when getting too close to the ZOV, this process might start to generate too many details.
The underscanning system is designed to reduce the amount of data collected for surfaces very close to the ZOV, while still maintaining an acceptable level of accuracy. It aims to keep the collected data above a minimum point size for optimal display in a VR headset.
The default setting for the minimum point size is 1mm,
{% hint style="info" %}
**Note:** It should be noted that if a scene has objects very close to the ZOV and the rendering times and file sizes are too high, increasing the minimum point size might be beneficial. The larger the point size, the more underscanning will be triggered.
{% endhint %}
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