Constraint Curvature Type

Changes how curvature is calculated at the picked blend curve constraint.

Two tools are available on the Constraint Curvature Type pull-out: Blend constraint geometric curvature , and Blend constraint parametric curvature .

Access these tools from the Blend Curve Toolbox:

Parametric curvature

Aligns the curvature to an isoparametric direction of the surface.

This type of curvature is especially useful to achieve curvature continuity with the edge of a surface.

Geometric curvature

Aligns the curvature to the intersection of the tangent and the normal direction of the surface.

• Construct a plane from the surface normal and the constraint direction or the normal and the tangent of the curve at the attach point for location constraints.

• Create a section curve by intersecting this plane with the surface.

• Align the curvature to this section curve.

  

  Note: You must use geometric curvature if you want the blend curve to be planar (all points on the curve lie in the same plane).