---
title: "Cluster"
url: "https://help.maxon.net/c4d/en-us/Content/html/OEXPLOSIONFX-ID_EXPLOSIONFX_CLUSTER.html"
section_path: "Create Menu > Deformer > Explosion FX Object > Cluster"
element_id: "OEXPLOSIONFX"
group_id: "ID_EXPLOSIONFX_CLUSTER"
description: "Enter a Thickness value here to give exploding clusters volume. The volume is achieved by extruding the cluster surfaces in the direction of their surface …"
---

## Cluster

### Thickness

Parameter ID: `EXPLOSIONFX_THICKNESS` · Range: [-∞..+∞m]

Enter a Thickness value here to give exploding clusters volume. The volume is achieved by extruding the cluster surfaces in the direction of their surface Normals. To reverse the direction of the extrusion, enter a negative value.

### Variation

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

Use Variation to vary the thickness of clusters.

### Density

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

Here, enter a density so that the weight of each cluster can be calculated and taken into account. If you want the explosion to ignore cluster weight, set Density to 0.

### Variation

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

Use Variation to vary the density of clusters.

### Cluster Type

Parameter ID: `EXPLOSIONFX_CLUSTERKIND`

### Mask

Parameter ID: `EXPLOSIONFX_CLUSTER_NAME`

### Fix Unselected

Parameter ID: `EXPLOSIONFX_CLUSTERFIX`

### Min Polys

Parameter ID: `EXPLOSIONFX_CLUSTER_MIN_POLYS` · Range: [1..2147483647]

### Max Polys

Parameter ID: `EXPLOSIONFX_CLUSTER_MAX_POLYS` · Range: [2..2147483647]

The Cluster Type defines how clusters are formed from the object's polygons.

Polygons

Each polygon forms a cluster.

Automatic

Choose this setting if you want each cluster to have a random number of polygons. Enter the lowest number of polygons per cluster into the **Min Polys** box and enter the highest number into **Max Polys**.

Use Selection Tags

Each polygon selection forms a cluster. The unselected polygons form a single, unselected cluster. To prevent the unselected cluster from moving, enable **Fix Unselected**. However, if you type the name of a selection into the **Mask** box, only two clusters will be formed – one cluster for the named selection, the other cluster for all remaining polygons.

Selections + Polys

Each polygon selection forms a cluster. Each unselected polygon also forms a cluster. However, if you type the name of a selection into the **Mask** box, a cluster is formed for that selection and a cluster is created for each remaining polygon.

### Disappear

Parameter ID: `EXPLOSIONFX_DISAPPEAR`

Enable the **Disappear** option if you want the clusters to shrink and eventually disappear during the explosion.

### Kind

Parameter ID: `EXPLOSIONFX_DISAPPEARKIND`

The Kind parameter controls whether the clusters disappear after a certain time (Time) or distance (Distance).

### Start

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

### Duration

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

You can enter the Start and Duration as a percentage of time or as a distance in meters.