Changes how the direction of the picked blend curve constraint is set.

Two tools are available on the Constraint Direction Type pull-out: Blend constraint directed, and Blend constraint parallel.

Blend constraint directed

Constrains the curve to pass through the blend point in a certain direction. Set the direction with BlendCrv Tools > Blend Curve Edit .

Blend constraint parallel

Constrains the curve to pass through the blend point along a certain line (in either direction). Set the line with BlendCrv Tools > Blend Curve Edit .