'Scenekit calculate position at specific distance from a know position along a line

My math is a bit rusty... Using SceneKit I need calculate the coordinate of P3 at specific distance from P2.

let P1 = SCNVector(1,0,1)
let P2 = SCNVector(4,0,4)
let D =  = 1

pic

mathcoordinatesscenekitcartesian


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