---
title: "Length"
url: "https://help.maxon.net/c4d/en-us/Content/html/MHAIRMATERIAL-HAIRMATERIAL_GROUP_LENGTH.html"
section_path: "Simulate Menu > The Simulation System > Hair > Hair material > Hair Material > Length"
element_id: "MHAIRMATERIAL"
group_id: "HAIRMATERIAL_GROUP_LENGTH"
description: "This setting defines the length of the hair, in percent along the guides."
---

## Length

This setting defines the length of the hair, in percent along the guides.

### Length

Parameter ID: `HAIRMATERIAL_LENGTH` · Range: [0..100%]

![Image: 005211.jpg](https://help.maxon.net/c4d/en-us/Content/Resources/Images/005211.jpg)\
From left to right, a part with **Length** values of 20%, 60% and 100%, respectively.

Use the **Length** slider to define at which length the hair should be cut.

This is exactly the setting you need if you want to animate hair growing. Style your hair as it should look in its final state and animate the **Length** setting from 0% to 100%, and the hair will grow. Make sure you turn off dynamics (Hair object: Dynamics / **Enable** option).

### Variation

Parameter ID: `HAIRMATERIAL_LENGTH_VAR` · Range: [0..100%]

Use **Variation** to define the maximum random variance in height the hair should have. A value of 0% will make all hairs equally long. If a texture has been loaded, a **Variation** value of 0% will cause the hairs to be as long as is defined by the texture.

### Amount

Parameter ID: `HAIRMATERIAL_LENGTH_AMOUNT` · Range: [0..100%]

Use this slider to define to what degree randomly selected hair will be affected by the other **Length** settings.

### Texture

Parameter ID: `HAIRMATERIAL_LENGTH_SHADER`

![Image: 005212.jpg](https://help.maxon.net/c4d/en-us/Content/Resources/Images/005212.jpg)\
The texture at the top left was loaded into the **Length** channel's **Texture** field, and used to generate the varying hair lengths.

The **Texture** setting lets you use a bitmap's grayscale to regulate the length of hair.