Differential D2013 Diff 6715 manual/modeling/surfaces/introduction.rst

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manual/modeling/surfaces/introduction.rst

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	or, to a lesser extent, the filling of closed 2D curves. And you can have "1D" curves made of surfaces,	or, to a lesser extent, the filling of closed 2D curves. And you can have "1D" curves made of surfaces,
	like a NURBS surface with only one row (either in U or V direction) of control points produces only a curve...	like a NURBS surface with only one row (either in U or V direction) of control points produces only a curve...

	Visually you can tell which is which by entering Edit mode and looking at the 3D window's header:	Visually you can tell which is which by entering Edit mode and looking at the 3D window's header:
	either the header shows Surface or Curve as one of the menu choices. Also,	either the header shows Surface or Curve as one of the menu choices. Also,
	you can :doc:`extrude </modeling/curves/editing/extrude>` a whole NURBS surface curve to create a surface,	you can :doc:`extrude </modeling/curves/editing/extrude>` a whole NURBS surface curve to create a surface,
	but you can't with a simple NURBS curve (we talk here about the "standard" Extrude tool,	but you can't with a simple NURBS curve (we talk here about the "standard" Extrude tool,
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	Like curves, surfaces can be closed (cyclical) or open, independently in both directions,	Like curves, surfaces can be closed (cyclical) or open, independently in both directions,
	allowing you to easily create a tube, donut or sphere shape,	allowing you to easily create a tube, donut or sphere shape,
	and they can be drawn as "solids" in Edit mode.	and they can be drawn as "solids" in Edit mode.
	This makes working with surfaces quite easy.	This makes working with surfaces quite easy.


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