Active Spline

    The Active Spline panel is used in Edit Mode to control properties of the currently selected spline.

    Active Spline panel.

    • Cyclic U/V
    • Like curves, surfaces can be closed (cyclical) or open, independently in both directions,allowing you to easily create a tube, donut or sphere shape,and they can be viewed as "solids" in Edit Mode.This can be set per interpolation axis.
    • Bézier U
    • Endpoint U/V
    • Makes the surface contact the end control points.This can be set per interpolation axis.Cyclic must be disabled for this option to work.

    In the image below, the U interpolation axis is labeled as "U"and the V interpolation axis is labeled as "V".The U's interpolation axis has been set to _Endpoint_and as such the surface now extends to the outer edges fromE1 to E2 along the U interpolation axis.

    To cause the surface to extend to all edges,Endpoint would be set for the V's axis as well.

    • Order U/V

    For illustration purposes, in both Fig. ,the knot vectors were set to Endpoint, causing the surface to extend to all edges.

    You can set independently the order for each interpolation axis,and like curves, it cannot be lower than 2,and higher than 6 or the number of control points on the relevant axis.

    • Resolution U/V
    • Alters the resolutionof each segment by changing the number of subdivisions.This can be set per interpolation axis.
    • Smooth