---
title: "Tag properties"
url: "https://help.maxon.net/c4d/en-us/Content/html/THAIRSPLINEDYNAMICS-ID_TAGPROPERTIES.html"
section_path: "Simulate Menu > The Simulation System > The various Simulation Tags > Rope > Tag properties"
element_id: "THAIRSPLINEDYNAMICS"
group_id: "ID_TAGPROPERTIES"
description: "Many of these settings should be familiar to you from the Cloth tag's Surface tab. These work exactly the same here."
---

## Tag properties

Many of these settings should be familiar to you from the Cloth tag's Surface tab. These work exactly the same here.

![Image: R26_rope.png](https://help.maxon.net/c4d/en-us/Content/Resources/Images/R26_rope.png)\
With precise collision detection, even ropes can be wound from splines.

### Bendiness

Parameter ID: `HAIR_SDYNAMICS_PBD_BENDINESS` · Range: [0.00..+∞]

![Image: R26_splinedynamics1_.png](https://help.maxon.net/c4d/en-us/Content/Resources/Images/R26_splinedynamics1_.png)\
The two parameters **Bendiness**and **Stretchiness**each with increasing values.

This allows you to control how easily splines "bend" at their points, i.e., how easily edge angles can deviate from their initial state. The larger the value, the easier the spline will bend. The type of behavior ranges from a thin stick (very small value) to a rubber hose, a rope or a bicycle chain (large value).

**Bendiness**also depends on the [Substeps](https://help.maxon.net/c4d/en-us/Content/html/OPBDSCENE-PBDSCENE_GROUP_XPBDPROPERTIES.html.md) parameter in the Preferences menu. The larger the [Substeps](https://help.maxon.net/c4d/en-us/Content/html/OPBDSCENE-PBDSCENE_GROUP_XPBDPROPERTIES.html.md), the stiffer the spline will be (see also [Tips and Tricks](https://help.maxon.net/c4d/en-us/Content/html/Simulation.html.md)).

### Map

Parameter ID: `HAIR_SDYNAMICS_PBD_SETTINGS_GROUP-HAIR_SDYNAMICS_PBD_BENDINESS_WEIGHTS`

**Map** lets you use vertex maps that define point-level **Bendiness**. If you define a maximum value for the related parameter, the vertex map will use exactly this value at 100% weighting, half of it at 50% and so on.

### Curly

Parameter ID: `HAIR_SDYNAMICS_PBD_TWISTINESS`

If this option is enabled, the spline will also be stiffened with regard to twistability along its path. Imagine a helix-shaped spline that is deformed along its long axis. If **Torsion**is enabled, a spring force analog to a spiral spring will result - while maintaining the shape of the spline - which is controlled by the value defined for **Bendiness**. Both of these are defined together using one setting.

Note that too many spline intermediate points will weaken the effect.

### Stretchiness

Parameter ID: `HAIR_SDYNAMICS_PBD_STRETCHINESS` · Range: [0.00..+∞]

This controls how far the spline can stretch between each of its points compared to the initial length. The behavior with regard to defined values ranges from metal (small value) to very stretchable rubber (large value).

### Map

Parameter ID: `HAIR_SDYNAMICS_PBD_SETTINGS_GROUP-HAIR_SDYNAMICS_PBD_STRETCHINESS_WEIGHTS`

**Map** lets you use vertex maps that define **Strechiness**at the point level. If you define a maximum value for the related parameter, the vertex map will use exactly this value at 100% weighting, half of it at 50% and so on.

### Bounciness

Parameter ID: `HAIR_SDYNAMICS_PBD_BOUNCINESS` · Range: [0.00..+∞]

When collisions occur, this setting defines a "spring-back" force in the direction of the contact point Normal. If, for example, a rope falls parallel onto a plane, it will repel slightly if higher values are used. It will repel slightly from the surface.

Be careful with very high values here, otherwise faulty behavior may occur.

### Map

Parameter ID: `HAIR_SDYNAMICS_PBD_BOUNCINESS_WEIGHTS`

**Map** lets you use vertex maps that define the feather Thickness at the point level. If you define a maximum value for the related parameter, the vertex map will use exactly this value at 100% weighting, half of it at 50% and so on.

### Friction

Parameter ID: `HAIR_SDYNAMICS_PBD_FRICTION` · Range: [0.00..+∞]

When a spline touches another collision object (e.g., another spline with a Rope tag or objects to which a Collision/Cloth tag has been applied) **Friction** comes into play. This is a measure for the resistance elements have when they rub against one another. Smaller values define correspondingly less friction and larger values increase the friction accordingly.

Contact or collision occurs whenever points, triangles or edges approach closer than defined under **Radius**.

### Map

Parameter ID: `HAIR_SDYNAMICS_PBD_FRICTION_WEIGHTS`

**Map** allows you to use vertex maps that define **Friction** at the point level. If you define a maximum value for the related parameter, the vertex map will use exactly this value at 100% weighting, half of it at 50% and so on.

### Stickiness

Parameter ID: `HAIR_SDYNAMICS_PBD_STICKINESS` · Range: [0.00..+∞]

![Image: 2023_stickyness_spline_01.png](https://help.maxon.net/c4d/en-us/Content/Resources/Images/2023_stickyness_spline_01.png)\
Here 2 splines stick together after touching.

If you want to glue your splines to meshes or other splines, this is the right parameter. Make sure that enough points contact each other so the bounciness works best. Subdivide your spline, if necessary (e.g., with [Interpolation](https://help.maxon.net/c4d/en-us/Content/html/OSPLINERECTANGLE-ID_OBJECTPROPERTIES.html.md)). For more stickiness, higher values such as 500 might work better.

### Map

Parameter ID: `HAIR_SDYNAMICS_PBD_STICKINESS_WEIGHTS`

**Map** lets you use vertex maps that define **Stickiness** at the point level. If you define a maximum value for the related parameter, the vertex map will use exactly this value at 100% weighting, half of it at 50% and so on.

### Target Length

Parameter ID: `HAIR_SDYNAMICS_PBD_TARGET_LENGTH` · Range: [1..1000%]

When a constraint is created (usually image 0 at the beginning of the simulation), when the rope or spline is still in the initial state, each constraint has a very specific length. The rope will attempt to maintain these lengths in order to also maintain the overall rope length.

The rope length can now be defined in its length as a percentage or it can be animated. The rope will then shorten or lengthen accordingly.

### Map

Parameter ID: `HAIR_SDYNAMICS_PBD_TARGET_LENGTH_WEIGHTS`

**Map** lets you use vertex maps that define the **Target Length** at the point level. If you define a maximum value for the related parameter, the vertex map will use exactly this value at 100% weighting, half of it at 50% and so on.

### Radius

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

Radius works similarly to [Thickness](https://help.maxon.net/c4d/en-us/Content/html/CLOTHTAG-CLOTH_PBD_SETTINGS_GROUP.html.md) for the Cloth tag, except that here a radius is formed around the spline, below which approaching collision elements (object points, edges, triangles, splines) will be called up for collision.

A very important setting if you want to avoid penetrations. In order to avoid this, collisions should always occur before the geometry actually meets (which is why the default setting is 0.5 cm).

If you want to use a very small **Radius** for visual reasons - for example, to avoid objects hovering over surfaces as much as possible - it may be useful to increase the **Intermediate Steps** setting in the Simulation Project Settings. This lets you calculate collisions more precisely for faster movements.

If you have very strongly subdivided splines, it can happen that point distances turn out to be smaller than twice the **Radius**, which would trigger a permanent collision. What you want to avoid: Internally, Cinema 4D will automatically select a smaller radius for the respective points (40% of the shortest edge attached to this point). This means that the defined **Radius**value is not fixed but can be undercut depending on the distance between the spline points. This applies to self-collision and collision with other Cloth objects/splines. However, the defined Radius value always applies to Collision objects (Collision tag, Rope Belt).

> **Tip:** Note:See also [Particles](https://help.maxon.net/c4d/en-us/Content/html/OPBDSCENE-PBDSCENE_GROUP_XPBDPROPERTIES.html.md), where the radius can be made visible.

### Map

Parameter ID: `HAIR_SDYNAMICS_PBD_RADIUS_WEIGHTS`

**Map** lets you use vertex maps that define the **Radius** at the point level. If you define a maximum value for the related parameter, the vertex map will use exactly this value at 100% weighting, half of it at 50% and so on.

### Mass

Parameter ID: `HAIR_SDYNAMICS_PBD_MASS` · Range: [0.00..+∞]

Here you can define the total mass of the spline, which will be distributed evenly to all points. Higher masses develop more "thrust" when colliding. In other words: you have greater inertia.

### Map

Parameter ID: `HAIR_SDYNAMICS_PBD_MASS_WEIGHTS`

**Map** lets you use vertex maps that define the **Mass** at the point level. If you define a maximum value for the related parameter, the vertex map will use exactly this value at 100% weighting, half of it at 50% and so on.

Damping

You can already find an attenuation setting in the project settings ([Damping](https://help.maxon.net/c4d/en-us/Content/html/OPBDSCENE-PBDSCENE_GROUP_XPBDPROPERTIES.html.md)), but this applies to the entire scene. The following settings can be used to define the damping per vertex map down to the individual spline points.

Damping is nothing more than an artificial removal of kinetic energy from a simulation.

With increasing damping, the spline assigned to the tag behaves more and more as if it were moving in increasingly viscous media (from air -> water -> honey etc.).

### Override

Parameter ID: `HAIR_SDYNAMICS_PBD_PARTICLE_DAMPING_OVERRIDE`

Activate this option if you want to set the damping at tag or object level. Otherwise the global **Attenuation**will apply (see previous paragraph).

### Strength

Parameter ID: `HAIR_SDYNAMICS_PBD_PARTICLE_DAMPING` · Range: [0..+∞%]

Enter a maximum level of damping here, which can be adjusted at point level using a vertex map in the following **Map** field. Without a vertex map, the **Strength** will be applied to all spline points.

With increasing values, points will correspondingly slower - as with movement in air -> water -> honey etc.

Values greater than 100% are possible.

### Map

Parameter ID: `HAIR_SDYNAMICS_PBD_PARTICLE_DAMPING_WEIGHTS`

Place a vertex map here if you want to define damping at point level. Set a maximum value for **Strength**. With 100% vertex map weighting, the corresponding point is assigned exactly this maximum value; with smaller values correspondingly less.

Please note that a 0% weighting will result in the following parameter **Min. Starch** defined starch is used.

### Min Strength

Parameter ID: `HAIR_SDYNAMICS_PBD_PARTICLE_DAMPING_WEIGHTS_MIN` · Range: [0..+∞%]

If you have placed a vertex map under **Map**, the setting here defines which damping level corresponds to 0% weighting.

This simplifies the drawing of the vertex map, as you usually operate with 0% and 100% values here. You then do not have to set intermediate values such as 2% in the Paint tool.

### Tearing

Parameter ID: `HAIR_SDYNAMICS_PBD_TEARING`

Splines can also tear if the distance between their points exceeds a certain limit (**Tear past**). The tear will always take place at a spline point.

### Tear Past

Parameter ID: `HAIR_SDYNAMICS_PBD_TEARPAST` · Range: [100..+∞%]

Provided the previous **Tear** option is enabled, this value specifies the allowable strain factor for each intermediate spline segment. If the intermediate segment is 5 cm long at the start of the simulation it can be stretched to 7.5 cm at a value of 1.5 without tearing. If the stretch is greater, the spline will split into two sections.

### Map

Parameter ID: `HAIR_SDYNAMICS_PBD_TEARING_WEIGHTS`

With **Map** you can use vertex maps that define **Tear After** at the point level. If you define a maximum value for the related parameter, the vertex map will use exactly this value at 100% weighting, half of it at 50% and so on.

For example, if you want to tear a spline, set **Tear After** to 90%, for example. Without a vertex map, the spline would immediately disintegrate into its individual parts. Therefore, a vertex map must ensure that all points that have to hold have a 0% weighting, while a 100% weighting is at the loation of the tear, for example.

### Display Anchors

Parameter ID: `HAIR_SDYNAMICS_PBD_DRAW_FIXED`

If you use the following buttons to fixate selected spline points, this option can be used to color the fixated points.

### Fixed:

Parameter ID: `HAIR_SDYNAMICS_PBD_FIXED`

### Set

Parameter ID: `HAIR_SDYNAMICS_PBD_SET_FIXED`

### Release

Parameter ID: `HAIR_SDYNAMICS_PBD_RELEASE_FIXED`

### Clear

Parameter ID: `HAIR_SDYNAMICS_PBD_CLEAR_FIXED`

Allows you to set spline anchor points - these are fixed and do not move. Use **the Se**t option to fix the selected spline points. **Release d**oes just that for the selected points. **Delete**removes all anchor points.