SOLIDWORKS, Top 11 Features in SOLIDWORKS 2020

Top 11 Features in SOLIDWORKS 2020: G3 Continuity

By Stephen Petrock on January 17, 2020

SOLIDWORKS spline relations

It has been described as the holy grail of spline continuity. Maybe that’s an overstatement, but many designers have been waiting a very long time for the ability to add G3 continuity to line segments. Now with SOLIDWORKS 2020, you can create accurate Class-A surfaces with the G3 connection. A G3 connection describes the intersection of two curves. The G3 relation at this point forms the smoothest transition between the line segments; it’s a must-have for anyone creating class-A surfaces..

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SOLIDWORKS spline relations

What is G3 Continuity?

The Torsion continuity or G3 relation can be applied to a point between a spline and another sketch segment. At this shared point, the G3 relation will do a few things to the sketch entities:

  • Create a smooth continuity at the end point
  • Apply equal curvature
  • Apply an equal rate of curvature

How to Apply G3 Continuity

G3 continuity selection in SOLIDWORKSThe G3 relation can be applied at the end point of a spline and where it joins with one of the following sketch entities:

  • Another spline
  • Traditional arcs
  • Conical or elliptical arcs
  • Model edges that are linear, circular, conic, parabolic, elliptical or spline-based

It’s incredibly easy to add the relation. When you are editing a sketch, click on the appropriate point, and add the sketch relation just like you would any other relation like tangent or parallel.

Why G3 Continuity is Important

This is a step up from the equal curvature relationship. The G3 link will add a continuous curvature relationship. This means there will be a smooth blending at the junction of the lines. This is what makes it a Class-A surface – something that has no physical joint present or visible. G3 refers to the level of complexity of the geometry, something all SOLIDWORKS users are already familiar with-just presented in a different context.

    • G_ is no connection
    • G0 is connect points which has sharp edges
    • G1 is tangent which we see in engineering fillets
    • G2 is equal curvature which has a curvature blend with a lead in
    • G3 is the equal curvature with equal rate of curvature as well which is true Class A quality blendsG3 Relation Application in SOLIDWORKS

Check out the video to learn how to use this new feature. Take an in-depth look at how to use the new torsion control relationship in SOLIDWORKS 2020 to add Class A surfaces to your SOLIDWORKS designs.


Do you want to learn more about the SOLIDWORKS 2020 enhancements and updates? See our entire blog series for complete details and videos.