# DoesChannelExistAt

Source: https://www.nianticspatial.com/docs/api/unity/NianticSpatial.NSDK.AR.SceneSegmentation.ARSceneSegmentationManager.DoesChannelExistAt/

DoesChannelExistAt

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## Declaration

public bool DoesChannelExistAt(int viewportX, int viewportY, SceneSegmentationChannel channel, Nullable<XRCameraParams> cameraParams = null)

#### Summary

Check if a semantic class is detected at the specified location in screen space, based on the confidence
    threshold set for this channel. (See TrySetChannelConfidenceThresholds)

#### Returns

True if the semantic class exists at the given coordinates.

### Parameters

| Name | Type | Summary |
| --- | --- | --- |
| viewportX | int | Horizontal coordinate in viewport space. |
| viewportY | int | Vertical coordinate in viewport space. |
| channel | SceneSegmentationChannel | The semantic channel to look for. |
| cameraParams | Nullable<XRCameraParams> | Params of the viewport to sample with. Defaults to current screen dimensions if null. |

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## Overload

public bool DoesChannelExistAt(int viewportX, int viewportY, int channelIndex, Nullable<XRCameraParams> cameraParams = null)

#### Summary

Check if a semantic class is detected at the specified location in screen space, based on the confidence
    threshold set for this channel. (See TrySetChannelConfidenceThresholds)

#### Returns

True if the semantic class exists at the given coordinates.

### Parameters

| Name | Type | Summary |
| --- | --- | --- |
| viewportX | int | Horizontal coordinate in viewport space. |
| viewportY | int | Vertical coordinate in viewport space. |
| channel | SceneSegmentationChannel | The semantic channel to look for. |
| cameraParams | Nullable<XRCameraParams> | Params of the viewport to sample with. Defaults to current screen dimensions if null. |

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