geometry object's created in Blender lose details in SceneKit

I'm using Blender to design a custom geometry object which will be used in my sceneKit scene. I import it using childNodeWithName:. I experience a significant lost in accuracy of object representation. In blender it looks terrific(see the upper picture), but in sceneKit it is full of sharp edges(bottom image). What must be done to avoid such lost of details? I'm importing a cube with smooth edges so I'm guessing that shouldn't be to hard to represent in SceneKit.

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EDIT: I added visual representation of my problem.

Solution

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