Change the tangent direction at a blend point

Control how a blend point changes the shape of its blend curve.

Choose Curves > Blend Curve Toolbox to show an extra floating palette containing the BlendCrv Tools tab.
Choose BlendCrv Tools > Blend Curve Edit.
Click the blend point you want to edit.
Use the tangent manipulator to set the tangent direction at the picked blend point, or to move the blend point.
Tip
Hold and click to select multiple blend points. Changes to the tangent direction manipulator are applied to all the selected blend points.

How do I use the tangent direction manipulator?

To set the tangent direction, click an axis line.
For direction constraints, the axis lines relate to world space (X, Y, Z). For geometry constraints, the axis lines relate to the curve, surface, or point cloud (U, V, Normal).
To change the rotation freely, click the rotation handle (the small circle on the arrow), then drag with the different mouse buttons or type rotational coordinates.
To change the rotation in a plane, click an arc, then drag left and right or type a rotation angle.
To change the tangent magnitude, click the square, then drag left or right or type a value.
To change the curvature magnitude, click the large circle, then drag left or right or type a value. The default is 1.0.

This handle appears when the constraint’s continuity is set to G2 or higher.
To change the curvature rate of change, click the small circle, then drag left or right or type a value. The default is 1.0.

This handle appears when the constraint’s continuity is set to G3 or higher.

Tip

The BlendCrv Tools > Constraint Interpolation Direction > Blend constraint interp direction tool also allows you to move blend points. This tool can be invoked during curve creation. In this instance, the point added last is highlighted and can be moved while a curve is being created.