Repeating a texture over a plane in SceneKit

Question

I have a 32x32 .png image that I want to repeat over a SCNPlane. The code I've got (See below) results in the image being stretched to fit the size of the plane, rather than repeated.

CODE:

let planeGeo = SCNPlane(width: 15, height: 15)

let imageMaterial = SCNMaterial()
imageMaterial.diffuse.contents = UIImage(named: "art.scnassets/grid.png")

planeGeo.firstMaterial = imageMaterial

let plane = SCNNode(geometry: planeGeo)

plane.geometry?.firstMaterial?.diffuse.wrapS = SCNWrapMode.repeat
plane.geometry?.firstMaterial?.diffuse.wrapT = SCNWrapMode.repeat

Answer 1

I fixed it. It seems like the image was zoomed in. If I do imageMaterial.diffuse.contentsTransform = SCNMatrix4MakeScale(32, 32, 0), the image repeats.