SceneKit Object between two points

Question

Given 2 points in 3D (a,b) and an SCNCapsule, SCNTorus, SCNTube etc., how to go about to position the object, so that the object starts at poin

Answer 1

I've good news for you ! You can link two points and put a SCNNode on this Vector !

Take this and enjoy drawing line between two points !

class   CylinderLine: SCNNode
{
    init( parent: SCNNode,//Needed to line to your scene
        v1: SCNVector3,//Source
        v2: SCNVector3,//Destination
        radius: CGFloat,// Radius of the cylinder
        radSegmentCount: Int, // Number of faces of the cylinder
        color: UIColor )// Color of the cylinder
    {
        super.init()

        //Calcul the height of our line
        let  height = v1.distance(v2)

        //set position to v1 coordonate
        position = v1

        //Create the second node to draw direction vector
        let nodeV2 = SCNNode()

        //define his position
        nodeV2.position = v2
        //add it to parent
        parent.addChildNode(nodeV2)

        //Align Z axis
        let zAlign = SCNNode()
        zAlign.eulerAngles.x = CGFloat(M_PI_2)

        //create our cylinder
        let cyl = SCNCylinder(radius: radius, height: CGFloat(height))
        cyl.radialSegmentCount = radSegmentCount
        cyl.firstMaterial?.diffuse.contents = color

        //Create node with cylinder
        let nodeCyl = SCNNode(geometry: cyl )
        nodeCyl.position.y = CGFloat(-height/2)
        zAlign.addChildNode(nodeCyl)

        //Add it to child
        addChildNode(zAlign)

        //set constraint direction to our vector
        constraints = [SCNLookAtConstraint(target: nodeV2)]
    }

    override init() {
        super.init()
    }
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
}

private extension SCNVector3{
    func distance(receiver:SCNVector3) -> Float{
        let xd = receiver.x - self.x
        let yd = receiver.y - self.y
        let zd = receiver.z - self.z
        let distance = Float(sqrt(xd * xd + yd * yd + zd * zd))

        if (distance < 0){
            return (distance * -1)
        } else {
            return (distance)
        }
    }
}