Curve Tools tray

Tool Name	Icon	Purpose
Create Curve		Lets you draw a 3D curve on the model, or a 2D curve on the screen plane. (Mudbox recognizes whether you are drawing on a model or in empty screen space, and creates either a 3D or a 2D curve accordingly.) See also Draw 2D curves on the view plane or Draw 3D curves on a mesh. The Create Curve tool is sensitive to the end-points of existing curves, so if your stroke passes close to the end point of another end point, a new line connects one curve to the other. A small circle displays around the end point when your cursor is in range to extend or connect curves. (See Extend or connect curves.)
Grab Curve		Lets you modify the shape of an existing curve. See Modify the shape of a curve.
Smooth Curve		Lets you smooth out bumps or jagged details on the curve by averaging the neighboring points.
Erase Curve		Lets you erase sections of a curve, or entire curves. See Erase curves or curve segments. Set the Closest Curve Only property to determine whether the brush can affect multiple curves at once.
Curve Loop		Lets you create curves that loop the entire mesh, aligning the loops on the model where it intersects with a specified plane. See Create precise 3D curves based on a plane.
Border Curve		Lets you create curves on the edge of the active mesh, or around the edges of a hole within the mesh. See Add curves to mesh edges.

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