---
title: "Options"
url: "https://help.maxon.net/c4d/en-us/Content/html/TOOLHAIRCURL-MDATA_MAINGROUP.html"
section_path: "Simulate Menu > The Simulation System > Hair > Tools, Functions, Modes > HAIR Tools > Curl > Options"
element_id: "TOOLHAIRCURL"
group_id: "MDATA_MAINGROUP"
description: "Use this setting to define the degree to which the hair should be curled. Negative values can also be entered, which will reverse the curl of the hair."
---

## Options

### Strength

Parameter ID: `HAIR_TOOL_CURL_STRENGTH` · Range: [-∞..+∞%]

Use this setting to define the degree to which the hair should be curled. Negative values can also be entered, which will reverse the curl of the hair.

### Angle

Parameter ID: `HAIR_TOOL_CURL_ANGLE` · Range: [-∞..+∞°]

![Image: 005154.jpg](https://help.maxon.net/c4d/en-us/Content/Resources/Images/005154.jpg)\
Left a small and large **Angle** value; right, a small and large **Tightness** value..

**Angle** defines the amount of curl. Higher values will result in curls with an increased spiral.

### Tightness

Parameter ID: `HAIR_TOOL_CURL_TIGHTNESS` · Range: [-∞..+∞%]

This setting defines the degree to which the curl should be bent in the direction of the guide root. The **Tighten** tab contains a graph with which you can adjust the amount of tightening along the length of the guide.

### X Height

Parameter ID: `HAIR_TOOL_CURL_AMP_X` · Range: [0..+∞m]

### Y Height

Parameter ID: `HAIR_TOOL_CURL_AMP_Y` · Range: [0..+∞m]

![Image: 005155.jpg](https://help.maxon.net/c4d/en-us/Content/Resources/Images/005155.jpg)\
Left half: Low and higher **X / Y Height** values. Right half: Additionally, lower and higher **Length X / Y** values (all have **Angle** and **Tightness** values of 0).

**X Height** and **Y Height** define the size of the spiral on their respective axes (when on a surface horizontal to the hair tangent). If both values are equal, a round spiral will result.

### X Length

Parameter ID: `HAIR_TOOL_CURL_PERIOD_X` · Range: [0..+∞m]

### Y Length

Parameter ID: `HAIR_TOOL_CURL_PERIOD_Y` · Range: [0..+∞m]

Use these settings to control how the **X Curl** and **Y Curl** curves will be applied along the length of the guides. Lower values will cause the curves to repeat more often.