marcelvanworkum

import sys

def combinationsNoOrder(a, n):
    if n == 1:
        for x in a:
            yield [x]
    else:
        for i in range(len(a)):
            for x in combinationsNoOrder(a[:i], n-1):
                yield [a[i]] + x

marcelvanworkum

import SceneKit

extension SCNNode {
  static func text(
    withString string: String,
    color: UIColor,
    fontSize: Float = 0.1,
    shouldLookAtNode lookAtNode: SCNNode? = nil,
    addAboveExistingNode existingNode: SCNNode? = nil) -> SCNNode {