# GetChannelIndicesAt

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

GetChannelIndicesAt
Returns an array of channel indices that are present at the specified pixel onscreen.

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## Declaration

public List<int> GetChannelIndicesAt(int viewportX, int viewportY, Nullable<XRCameraParams> cameraParams = null)

#### Summary

Returns an array of channel indices that are present at the specified pixel onscreen.

#### Remarks

This query allocates garbage.

#### Returns

An array of channel indices present for the pixel.

### Parameters

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

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