[Home](./index.md) > [server](./server.md) > [CollisionGroup](./server.collisiongroup.md) ## CollisionGroup enum The default collision groups. **Signature:** ```typescript export declare enum CollisionGroup ``` ## Enumeration Members

Member	Value	Description
ALL	`65535`
BLOCK	`1`
ENTITY	`2`
ENTITY\_SENSOR	`4`
ENVIRONMENT\_ENTITY	`8`
GROUP\_1	`32`
GROUP\_10	`16384`
GROUP\_11	`32768`
GROUP\_2	`64`
GROUP\_3	`128`
GROUP\_4	`256`
GROUP\_5	`512`
GROUP\_6	`1024`
GROUP\_7	`2048`
GROUP\_8	`4096`
GROUP\_9	`8192`
PLAYER	`16`

## Remarks Collision groups determine which objects collide and generate events. Up to 15 groups can be registered. Filtering uses pairwise bit masks: - The belongsTo groups (the 16 left-most bits of `self.0`) - The collidesWith mask (the 16 right-most bits of `self.0`) An interaction is allowed between two filters `a` and `b` if: ``` ((a >> 16) & b) != 0 && ((b >> 16) & a) != 0 ``` \*\*Category:\*\* Physics