# 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.<br>

**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, <br>

{% 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 %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.v-nova.com/technologies/v-nova.presenz/v-nova-presenz-documentation/underscan.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.