BlendEdge | Rhino 3-D modeling

The BlendEdge command creates a curvature-continuous blend surface between polysurface edges with varying radius values.

How to chain select

Select the first segment.

ChainEdges options

AutoChain

Selecting a curve or surface edge automatically selects all curve segments connected with the level of continuity set by the ChainContinuity option.

ChainContinuity

Controls the level of continuity required between segments to be selected with the AutoChain option.

Direction

Forward

Selects curves in the positive curve direction.

Backward

Selects curves in the negative curve direction.

Both

Selects curves in both the positive and negative curve direction.

GapTolerance

If the gap between two edges/curves is less than this value, the chain selection will ignore the gap and will select the next segment.

AngleTolerance

When Continuity is set to Tangency, if the angle between two edges/curves is less than this value, the chain selection will consider the criteria for continuity met and will select the next segment.

Undo

Undo last segment selection.

Select next segment.

All

Select all segments.

In cases where the command is canceled or ended prematurely, the PreviousEdgeSelection option re-selects the previously selected edges. Supports multiple sets of previously selected edges for up 20 previous edge sets.

Radius/Distance options

The Radius and Distance options appear on the command line when you drag a handle grip.

FromCurve

Select a curve. The radius of the curve at the picked location will be used.

FromTwoPoints

Pick two points to show the radius distance.

Handle options

AddHandle

Adds a handle along the edges.

CopyHandle

Adds a new handle using the distance from the selected handle.

RemoveHandle

Visible only when at least one handle has been added.

SetAll

Sets the distance or radius for all handles.

LinkHandles

Editing a single handle updates all handles.

Note

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Only added handles can be removed.

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The default handles at the ends of each open edge segment cannot be moved or deleted. This is the minimum information the command needs in order to work.

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The handle at the end of a single closed edge can be moved but not deleted.

RailType options

Three rail types control the intersection.

DistFromEdge

The distance from the edge curves determines the intersection.

RollingBall

The radius of a rolling ball determines the intersection.

DistBetweenRails

The distance between the edge rails determines the intersection.

Tips

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Always blend from the largest radius to the smallest radius across a model.

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Use MergeAllFaces or other modeling method to remove as many edges as possible. Fewer intersected edges = Fewer problems.

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Make sure there is enough room for the blend surface to trim and join with adjacent surfaces.

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The success of the blend operation depends on the angle relationships between surfaces, the sharpness of the bend in the rail around corners, and rail type.