hytopia/docs/server.collisiongroupsbuilder.md

The HYTOPIA SDK makes it easy for developers to create massively multiplayer games using JavaScript or TypeScript.

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[Home](./index.md) &gt; [server](./server.md) &gt; [CollisionGroupsBuilder](./server.collisiongroupsbuilder.md)

## CollisionGroupsBuilder class

A helper class for building and decoding collision groups.

When to use: creating custom collision filters for colliders and rigid bodies. Do NOT use for: per-frame changes; collision group changes are usually infrequent.

**Signature:**

```typescript
export default class CollisionGroupsBuilder 
```

## Remarks

Use the static methods directly to encode or decode collision group masks.

\*\*Category:\*\* Physics

## Methods

<table><thead><tr><th>

Method


</th><th>

Modifiers


</th><th>

Description


</th></tr></thead>
<tbody><tr><td>

[buildRawCollisionGroups(collisionGroups)](./server.collisiongroupsbuilder.buildrawcollisiongroups.md)


</td><td>

`static`


</td><td>

Builds a raw collision group mask from a set of collision groups.


</td></tr>
<tr><td>

[decodeCollisionGroups(collisionGroups)](./server.collisiongroupsbuilder.decodecollisiongroups.md)


</td><td>

`static`


</td><td>

Decodes collision groups into their string equivalents.


</td></tr>
<tr><td>

[decodeRawCollisionGroups(groups)](./server.collisiongroupsbuilder.decoderawcollisiongroups.md)


</td><td>

`static`


</td><td>

Decodes a raw collision group mask into a set of collision groups.


</td></tr>
<tr><td>

[isDefaultCollisionGroups(collisionGroups)](./server.collisiongroupsbuilder.isdefaultcollisiongroups.md)


</td><td>

`static`


</td><td>

Checks if the collision groups are the default collision groups.


</td></tr>
</tbody></table>