5 Replies Latest reply on Aug 27, 2008 1:29 PM by Jennifer Zuba

# Interpolation method used in curve through points

Could anybody tell me the interpolation method being used in Solidworks when we use curve through points command.
• ###### Interpolation method used in curve through points
Good luck with this one. SolidWorks won't divulge their interpolation methods for splines or curve through points.
• ###### Interpolation method used in curve through points
I'm not sure that SW is being especially secretive about how they handle splines or curves through points; there may not be a whole lot to say about it. I suspect that they use splines for the curves through points. It should be pretty easy to test that out. Put some xyz coordinates in a spreadsheet and use that to make a text file and insert a curve through points. Put some points at the same coordinates and put a spline through the same points. When I did this for a simple 2D set of points, the spline and curve look identical.

Splines are nurbs. I suspect that tells the mathematically competent quite a bit about them.
• ###### Interpolation method used in curve through points
Thanks Steiger for the reply. I would compare spline and curve thru points and then arrive at a conclusion
• ###### Interpolation method used in curve through points
Thanks Zuba for the information.
• ###### Interpolation method used in curve through points
You are correct, Steiger, in that SW does use splines as their connecter in Curve Through Points; however SWx does not disclose how they are mathematically defining their splines. Splines aren't always defined based on NURBS equations. It really depends on the accuracy required in your model as to whether or not you can accept a spline as a substitute for a closed form equation of a line. I work in optics and using splines does not get us the accuracy we need. Exact mathematical solutions are required which unfortunately makes using splines a "no-no" for me.