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# GameplayKit Structures

## Topics

### Structures

[`struct GKBox`](/documentation/GameplayKit/GKBox)

The definition of an axis-aligned rectangular bounding volume addressed by the tree.

[`struct GKMeshGraphTriangulationMode`](/documentation/GameplayKit/GKMeshGraphTriangulationMode)

Options for how to place graph nodes when generating the graph, used by the [`triangulationMode`](/documentation/GameplayKit/GKMeshGraph/triangulationMode) property.

[`struct GKQuad`](/documentation/GameplayKit/GKQuad)

The definition of an axis-aligned rectangle addressed by the tree.

[`struct GKTriangle`](/documentation/GameplayKit/GKTriangle)

The definition of a triangle in the mesh, available with the [`triangle(at:)`](/documentation/GameplayKit/GKMeshGraph/triangle(at:)) method.


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