ios - adding a border around SceneKit node -

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i trying highlight selected node in scenekit tap gesture. unfortunately, have not been able accomplish it. best thing change material when node tapped. 

let material = key.geometry!.firstmaterial! material.emission.contents = uicolor.blackcolor()

can suggest way can go add border or outline around object instead of changing color of entire node?

scnnode conforms scnboundingvolume protocol.

this protocol defines getboundingboxmin:max: method.

use minimum , maximum coordinates of bounding box of geometry attached node.

then use scenekit primitive type scngeometryprimitivetypeline draw lines of bounding box. check scngeometryelement.


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