Bottom( <Quadric> )
Creates the bottom of the limited quadric.
what's meaning of " limited quadric"? How to understand " limited"？
It's like a line, it doesn't have any borders, on the contrary a segment has. It's the same with a quadric. As the manual says: Bottom(cylider) of a given cylinder creates a circle. But is you define a quadric as a parametric surface it hasn't got borders, so the command will nog work.
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