---
title: "Mask Region"
url: "https://help.maxon.net/zbr/en-us/Content/html/user-guide/3d-modeling/modeling-basics/masking/mask-region/mask-region.html"
section_path: "User Guide > 3D Modeling > Modeling Basics > Masking > Mask Region"
description: "The new Mask Region feature allows you to quickly draw a mask outline and ZBrush will automatically fill the mask at the press of a button. Complex masks …"
---

# Mask Region

*Automatically fill a mask outline*

The new Mask Region feature allows you to quickly draw a mask outline and ZBrush will automatically fill the mask at the press of a button. Complex masks can be created and by using the Analyze and Fill option you will have complete control over your masks.

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## How Mask Region Works

![Mask-Region-00](https://help.maxon.net/zbr/en-us/Content/Resources/Images/Mask-Region-00.png)\
*On the left, mask outlines drawn; on the right, after pressing Auto Region.*

1. Draw out a mask outline using the Mask Pen.
2. For automatic fill, press the Auto Region button.

![Mask-Region-01](https://help.maxon.net/zbr/en-us/Content/Resources/Images/Mask-Region-01.png)\
*Complex masks can be drawn and filled.*

1. To specify the portions of a mask outline, first press Analyze Region.
2. Mark the parts you want filled with a mask dot.
3. Press the Fill Region button.

![Mask-Region-02](https://help.maxon.net/zbr/en-us/Content/Resources/Images/Mask-Region-02.png)\
*On the left, an alpha mask applied, Analyze Region pressed and parts marked; on the right, after the Fill Region button is pressed.*

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## Mask Region Functions

![Mask-Region-btns](https://help.maxon.net/zbr/en-us/Content/Resources/Images/Mask-Region-btns.png)\
*Mask Region section in the Tool>Masking menu*

### Auto Region

The Auto Region button will automatically fill the mask outline. Complex masks can be created with outlines within outlines.

### Analyze Region

For full control of which outlines are filled the Analyze Region button must be pressed before marking the areas you wish to fill.

### Fill Region

After pressing the Analyze Region button, mark those areas you want filled with a mask blob. Pressing the Fill Region button will then fill only those areas.