# Create curves from other objects

Use existing objects to create curves by using the objects as location references or by copying borders, edges, and outlines.

## Draw a curve through points

CurveThroughPolyline

Create a curve from polyline vertices.

CurveThroughPt

Fit a curve through point objects.

CurveThroughSrfControlPt

Fit curves through surface control points.

## Blend between two curves or surfaces

ArcBlend

Create an arc blend curve between two curves.

Blend

Connect two curves maintaining continuity.

BlendCrv

Connect two curves with continuity control.

Chamfer

Create a line segment between two curves and trims or extends the curves to meet it.

Fillet

Add an arc between two curves and trims or extends the curves to the arc.

## Duplicate surface edges

DupBorder

Create a curve or polyline that copies a surface, polysurface, or mesh border.

DupEdge

Create a curve that copies a surface edge.

DupFaceBorder

Create a curve that copies a polysurface face border.

DupMeshEdge

Creates a polyline that duplicates the edge of a mesh.

DupMeshHoleBoundary

Create a polyline that duplicates the boundary of a mesh hole.

## Contour and section

Contour

Create a spaced series of planar curves and points through objects.

CSec

Create cross-section curves through profile curves.

MeshOutline

Create a polyline outline of mesh objects or surface render mesh.

PointCloudSection

Create a planar curve by intersecting a plane with a point cloud.

Section

Create a planar curve or points from the intersection of a cutting plane through objects.

Silhouette

Create outline curves from a surface or polysurface.

## Create curves from other curves

Crv2View

Create a curve by averaging two input curves that are planar in two different views.

Offset

Copy a curve parallel to the original.

OffsetCrvOnSrf

Copy a curve on a surface parallel to the original.

OffsetNormal

Copy a curve on a surface parallel to the original in the surface normal direction.

Project

Project curves/points toward a construction plane to intersect a surface.

Pull

Pull curves/points in the surface normal direction to intersect a surface.

ShortPath

Create the shortest possible curve (geodesic) between two points on a surface.

## Create curves from surfaces

Bounce

Shoot a ray at a collection of surfaces to create a polyline path.

CreateUVCrv

Project a surface boundary and trim curves onto the world x-y plane.

Intersect

Create point objects or curves at the intersections of curves and surfaces.

IntersectTwoSets

Find the intersection of one set of objects with another set of objects.

Make2D

Project geometry to the construction plane.

See also

Draw lines and curves

Edit curves

Extract object sub-elements

Rhinoceros 5 © 2010-2015 Robert McNeel & Associates. 17-Sep-2015

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