---
title: "Tag Properties"
url: "https://help.maxon.net/c4d/en-us/Content/html/THAIRSPLINEDYNAMICS-ID_TAGPROPERTIES_LEGACY.html"
section_path: "Simulate Menu > The Simulation System > The various Simulation Tags > Rope > Tag Properties"
element_id: "THAIRSPLINEDYNAMICS"
group_id: "ID_TAGPROPERTIES"
description: "Use this setting to determine if the splines should be checked for collision with other objects containing a Hair Collision tag."
---

## Tag Properties

> **Tip:** Tip: These settings only apply to the legacy spring mass simulation system (Basic tab **Legacy Solver**).

### Collisions

Parameter ID: `HAIR_SDYNAMICS_TAG_COLLISIONS`

Use this setting to determine if the splines should be checked for collision with other objects containing a Hair Collision tag.

### Rigid

Parameter ID: `HAIR_SDYNAMICS_TAG_EXTRA_STIFF`

Activate this setting to stiffen the springs connecting the mass points. The spline will try to maintain its shape without simply falling/collapsing, as it would if this option were not active. The splines will sway at or near their initial state, depending on rigidity.

### Set Initial

Parameter ID: `HAIR_SDYNAMICS_TAG_SET_STATE`

Use this setting to define a starting point for the spline simulation effect. This setting can also be used if, for example, the splines have fallen as a result of dynamics and you want to save the resulting state.

> **Tip:** Since the aforementioned option causes the fixing of points to be lost, it may be necessary to reset fixed points.