BlendCrv Tools > Blend Curve Create

Lets you create new blend curves in the scene by placing location constraints. You can also use this tool to edit existing blend curves.

Use the Blend Curve Create tool to create the initial shape of the curve. Then you can add, edit, or delete the initial constraints using the constraint tools.

Blend Curve Options

Knot Spacing: “Knot” is another term for edit point.

Chord – The chord length parameterizes the new curve edit points in current units. The chord length is the cumulative straight line distance between consecutive edit points. The starting point of the curve has the parameter 0.0, and the ending point has the parameter equal to the total chord length of the curve.

Uniform – The new curve edit points have integral parameters: the first edit point is parameter 0.0, the second is 1.0, and so on. This is the default.
Curve Degree: The mathematical degree of the curve created, which control the number of CVs per span: 1 (linear), 2 (quadratic), 3 (cubic), 5 or 7. The default is 5.
Auto Align at Surface Corners: When this option is checked on (default), a blend curve that is snapped to the corner of a surface (or trim surface) is automatically aligned with tangent continuity to one of the edges (or trim edges).

Auto Align at Surface Corner OFF (left) and ON (right).
Curve to Curve Continuity: When this option is set to G2 (default) blend curves align with G2 continuity when they snap to other curves. When set to G0, only positional continuity is guaranteed when snapping to curves.
Pivot Position: Specifies the initial position of the curve's pivot points (both rotation and scaling).

Origin – The pivot points are located at (0, 0, 0).

First CV – The pivot points are located at the position of the first CV, that is, the start of the curve. This is the default.

Last CV – The pivot points are located at the position of the last CV, that is, the end of the curve. The pivots position is re-calculated and displayed every time a new control point is placed (after the first one).

Curve center – The pivot points are located in the middle of the curve, based on arc length. (This is the same position as Snap to Center in the Curve Snap Options box.) The pivots position is re-calculated and displayed every time a new control point is placed (after the first one).

Bounding box center – The pivot points are located at the center of the curve's bounding box. The pivots position is re-calculated and displayed every time a new control point is placed (after the first one).