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I'm trying to make a part of my app which simulates dropping a set of books (the grey rectangles) one on top of another, on a table. Attached is a video.

However, unlike books in real life, these books bounce slightly after each one is dropped, to the point the pile of books falls over!

I've set the restitution to zero on each book's physicsBody, but this still happens:

private func buildBookNode(at position: SCNVector3, rotation: Measurement<UnitAngle> = Measurement(value: 0, unit: .radians)) -> SCNNode {

    let book = SCNBox(width: 0.4, height: 0.1, length: 0.3, chamferRadius: 0)

    let bookNode = SCNNode(geometry: book)

    bookNode.physicsBody = SCNPhysicsBody(type: .dynamic, shape: nil)

    bookNode.physicsBody?.isAffectedByGravity = true

    bookNode.physicsBody?.friction = 2.0

    bookNode.physicsBody?.mass = 0.3

    bookNode.physicsBody?.restitution = 0.0

    bookNode.position = position

    bookNode.rotation = SCNVector4(0.0, 1.0, 0.0, rotation.converted(to: .radians).value)

    return bookNode

}

What properties to I need to set to prevent the books bouncing on top of each other?

The parameter to control the bouncing is

bookNode.physicsBody?.damping = 0.9.

This may lead to slow motion of books. So a better idea is using contactDelegate to dynamic change the damping after collision.