Change the direction type of a blend curve constraint

Change the way a constraint affects the direction of the curve as it passes through the constraint.

Change the type of the picked blend points

Choose Curves > Blend curv toolbox to show an extra floating palette containing the BlendCrv Tools tab.

Do one of the following:

To constrain the curve to pass through the blend points position (without regard to direction), choose BlendCrv Tools > Constraint Interpolation Direction > Blend Constraint Interp Location.
To constrain the curve to pass through the blend point in a certain world space direction, choose BlendCrv Tools > Constraint Interpolation Direction > Blend Constraint Interp direction.
To constrain the curve to pass through the blend point in a direction relative to the object to which it is attached, choose BlendCrv Tools > Constraint Interpolation Direction > Blend Constraint Interp Geometry.
Note
You can only change a constraint to “geometry” if it is already attached to an object.

Change the type of a directional constraint

Do one of the following:

To set the actual direction of the tangent at this point, choose BlendCrv Tools > Constraint Direction Type > Blend constraint directed.
To set the tangent at this point along a line (in either direction), choose BlendCrv Tools > Constraint Direction Type > Blend constraint parallel.