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In my SCNScene I have ball, a floor plane with custom geometry (to replicate terrain) and one omni light. What I'm trying to do is make it so that the omni light only shines light on the ball and not the floor plane. I have read that I need to adjust each nodes categoryBitMask and have the lights categoryBitMask the same as the object I want it to act upon. However I have not been able to make this work and am very confused as to why... Any help is greatly appreciated, many thanks!!

Note: When I run the below code the light doesn't shine on anything, however when I remove the lights categoryBitMask it shines on both the ball and plane.

Code:

func addBall(ballPosition: SCNVector3) 

 let ball = SCNSphere(radius: 1)
 let ballNode = SCNNode(geometry: ball)
 ballNode.position = ballPosition

 let ballPhysicsBody = SCNPhysicsBody(type: .dynamic, shape: SCNPhysicsShape(geometry: SCNSphere(radius: 1)))
 ballPhysicsBody.categoryBitMask = 00000010

 ballNode.physicsBody = ballPhysicsBody
 self.rootNode.addChildNode(ballNode)

 addLight(referencePosition: ballPosition)


func addLight(referencePosition: SCNVector3) 

 let omniLight = SCNLight()
 omniLight.type = SCNLight.LightType.omni
 omniLight.color = UIColor.white
 omniLight.intensity = 1000
 omniLight.categoryBitMask = 00000010

 let lightNode = SCNNode()
 lightNode.light = omniLight
 lightNode.position = SCNVector3(x: referencePosition.x, y: 15, z: referencePosition.z)
 self.rootNode.addChildNode(lightNode)