Hi there. I'm trying to draw a 3D spline between 2 bodies. I start the spline on a face on body#1, and end the spline on a face on body#2. The only constraints that I want to define are that the spline ends start perpendicular to the faces, but I can't figure out how to do that. I tried dragging the handles, but that isn't very exact. I'm sure I'm missing something simple. If someone could steer me in the right direction, I'd appreciate it. Thanks.

Michael

Michael,

Steve's on the right track with the centerlines or construction lines.

I would place an On Plane constraint between the end points of the spline and the face of the body. Sketch construction lines from the end points of the spline and apply a perpendicular constraint between the construction line and the face. Finally apply a Tangent constraint between the spline and the construction line.

You may have to use the spline handle to drag the spline to approximate the tangent condition before applying the constraint.

I'm assuming that you are setting up some guide curves for a loft so you may need to make the spline coincedent to an edge on the body face; I get an errror message if the guide curve doesn't start and stop on an edge.