Blend Surfaces Property Editor

Creates a surface in the gap between two other surfaces.

To redisplay: Select the surface, choose Edit Properties Modeling Properties, and click the Blend Surfaces tab.

Inputs

Hide/Unhide	Hides all the inputs for the generated object to simplify the display of your scene in the 3D views, or unhides the inputs when you need to modify them.
Delete	Freezes the generator and deletes the inputs. This simplifies the scene once you are satisfied that you won't need to modify the inputs again.

Subdivision Type

Determines how you specify the number of subdivisions in the result.

Per Span uses the "natural" subdivisions as determined by the shapes of the inputs. You can subdivide each segment further using the U and V span sliders.

In this case, discontinuities resulting from multiknots in the inputs are preserved in the generated objects.

Absolute allows you to set the total number of subdivisions using the U and V abs sliders.

U, V span

The number of subdivisions corresponding to each segment of the inputs, when Subdivision Type is Per Span.

U, V abs

The total number of subdivisions, when Subdivision Type is Absolute.

Controls the shape of the blend where it meets the Start Surface and End Surface.

Continuity

The smoothness at the seam between the blend and input surfaces:

Position (C0). The seam may have a sharp point.
Tangent (C1). The tangent at the seam does not change abruptly.
Curvature (C2). Neither the tangent nor the curvature at the seam changes abruptly.

Tangent Scale Factor

Affects the extent of the influence of the surface on the blend.

Tangent Direction Match

Applies continuity between the blend surface and the input surface laterally.