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# GKSphereObstacle

A spherical impassable volume to be avoided by agents.

```
class GKSphereObstacle
```

## Overview

To make agents ([`GKAgent`](/documentation/GameplayKit/GKAgent) objects) avoid obstacles, create a goal with the [`init(toAvoid:maxPredictionTime:)`](/documentation/GameplayKit/GKGoal/init(toAvoid:maxPredictionTime:)-7oslq) method. Agents affected by an avoid-obstacles goal will attempt to move such that their radius never overlaps that of a spherical obstacle.

To learn more about using goals and agents, see [Agents, Goals, and Behaviors](https://developer.apple.com/library/archive/documentation/General/Conceptual/GameplayKit_Guide/Agent.html#//apple_ref/doc/uid/TP40015172-CH8) in [GameplayKit Programming Guide](https://developer.apple.com/library/archive/documentation/General/Conceptual/GameplayKit_Guide/index.html#//apple_ref/doc/uid/TP40015172).

## Topics

### Creating an Obstacle

[`init(radius:)`](/documentation/GameplayKit/GKSphereObstacle/init(radius:))

Initializes a spherical obstacle with the specified radius.

[`obstacleWithRadius:`](/documentation/GameplayKit/GKSphereObstacle/obstacleWithRadius:)

Creates a spherical obstacle with the specified radius.

### Placing an Obstacle

[`position`](/documentation/GameplayKit/GKSphereObstacle/position)

The position of the obstacle.

[`radius`](/documentation/GameplayKit/GKSphereObstacle/radius)

The radius of the obstacle.


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