# init(indices:primitiveType:) Creates a geometry element from the specified array of index values. ``` convenience init(indices: [IndexType], primitiveType: SCNGeometryPrimitiveType) where IndexType : FixedWidthInteger ``` ## Parameters `indices` An array of index values, each of which identifies a vertex in a geometry source. `primitiveType` The drawing primitive that connects vertices when rendering the geometry element. For possible values, see [`SCNGeometryPrimitiveType`](/documentation/SceneKit/SCNGeometryPrimitiveType). ## Discussion SceneKit connects the vertices in the order specified by the `indices` array, arranged according to the `primitiveType` parameter.This initializer is equivalent to the [`init(data:primitiveType:primitiveCount:bytesPerIndex:)`](/documentation/SceneKit/SCNGeometryElement/init(data:primitiveType:primitiveCount:bytesPerIndex:)) initializer, but does not require an intermediary object; instead, it automatically infers the necessary allocation size and [`bytesPerIndex`](/documentation/SceneKit/SCNGeometryElement/bytesPerIndex) values based on the contents of the `indices` array. To create a custom [`SCNGeometry`](/documentation/SceneKit/SCNGeometry) object from the geometry element, use the [`init(sources:elements:)`](/documentation/SceneKit/SCNGeometry/init(sources:elements:)) initializer. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)