# init(sources:elements:) Creates a new geometry built from the specified geometry sources and elements. ``` convenience init(sources: [SCNGeometrySource], elements: [SCNGeometryElement]?) ``` ## Parameters `sources` An array of [`SCNGeometrySource`](/documentation/SceneKit/SCNGeometrySource) objects describing vertices in the geometry and their attributes. `elements` An array of [`SCNGeometryElement`](/documentation/SceneKit/SCNGeometryElement) objects describing how to connect the geometry’s vertices. ## Discussion A geometry’s visible content comes from the combination of geometry sources, which contain data describing its vertices, with geometry elements, which contain data describing how the vertices connect to form a surface. Each [`SCNGeometrySource`](/documentation/SceneKit/SCNGeometrySource) object describes an attribute of all vertices in the geometry (vertex position, surface normal vector, color, or texture mapping coordinates) identified by the source’s [`semantic`](/documentation/SceneKit/SCNGeometrySource/semantic-swift.property) property. To create a custom geometry you must provide at least one source, for the [`vertex`](/documentation/SceneKit/SCNGeometrySource/Semantic-swift.struct/vertex) semantic. Typically, you also provide sources for normals and texture coordinates for use in lighting and shading. Sources for the vertex, normal, and color semantics must be unique—if multiple objects in the `sources` array have the same semantic, SceneKit uses only the first. A geometry may have multiple sources for the [`texcoord`](/documentation/SceneKit/SCNGeometrySource/Semantic-swift.struct/texcoord) semantic—the order of texture coordinate sources in the `sources` array determines the value to use for the [`mappingChannel`](/documentation/SceneKit/SCNMaterialProperty/mappingChannel) property when attaching materials. Each [`SCNGeometryElement`](/documentation/SceneKit/SCNGeometryElement) object describes how vertices from the geometry sources are combined into polygons to create the geometry’s shape. Creating a custom geometry requires at least one element. If the `elements` array contains multiple objects, their order determines the arrangement of the geometry’s materials—for details, see the discussion of the [`materials`](/documentation/SceneKit/SCNGeometry/materials) property. --- 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)