2 Replies Latest reply on Sep 4, 2013 9:45 PM by 1-4EQZK9

# 3D Curve with end conditions

Constructing section curves for a surface using multiple points and splines in a 3d sketch as image

I can set end conditions on the splines which are connected to the edges and control the bulge with the sketched point.

If I try and set tangent end conditions for the curve adjacent to the surface rather than edge then the point repositioned by the system - without end conditions the point can be any where in 3D, set end conditions and it moves th point.

Any ideas?

can't set end conditions on a 'curve thru' ref points'?

Am i going to have to build a plane and a 2D curve?

Cheers, Sean

sw2013

• ###### Re: 3D Curve with end conditions

Sean,

I am not sure what is different about your curve that is away from and edge, but have you tried fully defining the location of the point before you add the tangencies? That might stop the system from moving the center point.

Why do you wan to put that curve away from the edge? I would start out by placing it on the edge without a curve and see if that gave you a good enough surface.

Jerry S.

• ###### Re: 3D Curve with end conditions

Sean,

There are a couple of ways to do this type of bridge curve. My favorite method (and most robust constraint) is to use the tangent face and curvature to face end condition. It is somewhat undiscoverable but here is what you do: Click on the spline, then hold down contrl key, and click on the edge that it is connected to (the boundary of the solid face that you want to make tangent to, then click on the face of the suraface you want to be tangent to. With all three selected you should get tangent face or Curvature face constraint to make.

BTW, If your parent features are going to change a lot, I would only do one 3D sketch curve per sketch.  The 2014 Style spline is excellent for this type of bridge curve application.

Regards

Mark