SceneKit Culling Plane

Question

I have a SCNScene rendering in a SCNView. I have some *.dae models that are rendered/moving in the scene.

I have a transparent cube, when one of my models goes behin

Answer 1

Here's a solution

1. For the cube, use a material with constant as its lightingModel. It's the cheapest one.
2. This material will have writesToDepthBuffer set to true and colorBufferWriteMask set to [] (empty option set). That way the cube will write in the depth buffer, but won't draw anything on screen.
3. Set the cube's renderingOrder to -1 so that it's drawn before any other node in the scene. This will make the cube write in the depth buffer before any other object, preventing them from being drawn if they are behind the cube.

Answer 2

Based on @mnuages answer, you can use this class :

import SceneKit

class OccludingNode : SCNNode {
    convenience init(geometry: SCNGeometry) {
        geometry.materials = [OccludingMaterial()]

        self.init()
        self.geometry = geometry
        self.renderingOrder = -1
    }
}

class OccludingMaterial : SCNMaterial {
    override init() {
        super.init()
        isDoubleSided = true
        lightingModel = .constant
        writesToDepthBuffer = true
        colorBufferWriteMask = []
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

Create an OccludingNode from any geometry you want and anything behind it won't be rendered.