---
title: "Options"
url: "https://help.maxon.net/c4d/en-us/Content/html/TOOLHAIRDYNAMICS-MDATA_MAINGROUP.html"
section_path: "Simulate Menu > The Simulation System > Hair > Tools, Functions, Modes > Dynamic Interaction > Example"
element_id: "TOOLHAIRDYNAMICS"
group_id: "MDATA_MAINGROUP"
description: "Activate this option if you want to activate the interaction."
---

## Options

### Redraw

Parameter ID: `HAIR_TOOL_DYNAMICS_REDRAW`

Activate this option if you want to activate the interaction.

### Time

Parameter ID: `HAIR_TOOL_DYNAMICS_TIME` · Range: [-2147483648..2147483647]

Use this setting to define the intervals at which the depictions should take place in the editor view. Large values will result in a slow-motion effect.

### Dynamics

Parameter ID: `HAIR_TOOL_DYNAMICS_DYNAMICS`

### Collisions

Parameter ID: `HAIR_TOOL_DYNAMICS_COLLISIONS`

### Gravity

Parameter ID: `HAIR_TOOL_DYNAMICS_GRAVITY`

### Stiffness

Parameter ID: `HAIR_TOOL_DYNAMICS_STIFFNESS`

### Forces

Parameter ID: `HAIR_TOOL_DYNAMICS_FORCES`

The **Stiffness** setting reflects the [Stiffness](https://help.maxon.net/c4d/en-us/Content/html/OHAIR-HAIRSTYLE_GROUP_DYNAMICS.html.md) graph in the **Dynamics** tab of the Hair object (see **Dynamics** in chapter 4). If this setting is not active, springs will have practically no effect on the guides. The **Forces** setting refers to all external forces (e.g., Force Objects).

### Reset

Parameter ID: `HAIR_TOOL_DYNAMICS_RESET`

Click on this button to reset the guides to their initial state of rest. You can define this state of rest with **Set Initial State** (main Hair menu).

# Example

![Image: 005183.jpg](https://help.maxon.net/c4d/en-us/Content/Resources/Images/005183.jpg)

You can, for example, simply drag a sphere containing a Collision tag through the guides in the editor view (the **Dynamics** setting was deactivated in the example above). Activating the **Collisions** setting ensures that a collision will take place between the guides and the sphere. The guides will be bent accordingly.