Tangent to Face Relations with Splines Add Tangent Face or Equal Curvature relations between adjacent faces and 2D or 3D splines. Select the face, edge, and spline, and then add the relation. Tangent Equal Curvature Parent topicSpline Tools Displaying Inflection Points Displaying the Minimum Radius of a Spline Setting a Fixed Length Curvature Combs Converting Spline Types