Sizes
Description
In SceneKit, sizes are float data types, the size of 1f is equivalent to 1m. Therefore 0.1f is 10cm and 0.01f is 1cm.
Be careful not to make an object in your scene too big as you may not be able to see it (because you are effectively inside it!)
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Next Step : Shapes
After you have mastered this you should try Shapes