SWIFT 3 SCENEKIT IOS SCNGeometry Geometrie von Hand erzeugen.

func Quad() -> SCNGeometry {

    let verticesPosition = [

        SCNVector3Make( -2, -2, 3),

        SCNVector3Make(  2, -2, 3),

        SCNVector3Make(  2,  2, 3),

        SCNVector3Make( -2,  2, 3)

    ]

    let textureCord =    [CGPoint(x: 0.0,y: 0.1),

                          CGPoint(x: 0.1,y: 0.1),

                          CGPoint(x: 0.1,y: 0.0),

                          CGPoint(x: 0.0,y: 0.0)]

    

    let indices: [CInt] = [

        0, 2, 3,

        0, 1, 2

    ]

    

    let vertexSource = SCNGeometrySource(vertices: verticesPosition, count: 4)

    let srcTex = SCNGeometrySource(textureCoordinates: textureCord, count: 4)

    let date = NSData(bytes: indices, length: MemoryLayout<CInt>.size * indices.count)

    

    let scngeometry = SCNGeometryElement(data: date as Data, primitiveType: SCNGeometryPrimitiveType.triangles, primitiveCount: 2, bytesPerIndex: MemoryLayout<CInt>.size)

    

    let geometry = SCNGeometry(sources: [vertexSource,srcTex], elements: [scngeometry])

    return geometry

}