Extracting vertices from scenekit

Question

I\'m having a problem with understanding scenekit geometery.

I have the default cube from Blender, and I export as collada (DAE), and can bring it into scenekit....

Answer 1

With swift 3.1 you can extract vertices from SCNGeometry in a much faster and shorter way:

func vertices(node:SCNNode) -> [SCNVector3] {
    let vertexSources = node.geometry?.getGeometrySources(for: SCNGeometrySource.Semantic.vertex)
    if let vertexSource = vertexSources?.first {
        let count = vertexSource.data.count / MemoryLayout.size
        return vertexSource.data.withUnsafeBytes {
            [SCNVector3](UnsafeBufferPointer(start: $0, count: count))
        }
    }
    return []
}

... Today i've noted that on osx this not going to work correct. This happens because on iOS SCNVector3 build with Float and on osx CGFloat (only apple good do smth simple so suffering). So I had to tweak the code for osx but this not gonna work as fast as on iOS.

func vertices() -> [SCNVector3] {

        let vertexSources = sources(for: SCNGeometrySource.Semantic.vertex)


        if let vertexSource = vertexSources.first {

        let count = vertexSource.vectorCount * 3
        let values = vertexSource.data.withUnsafeBytes {
            [Float](UnsafeBufferPointer(start: $0, count: count))
        }

        var vectors = [SCNVector3]()
        for i in 0..