Merge Surfaces Property Editor

Creates a new surface that spans two existing surfaces.

To redisplay: Select the merged surface then choose Edit Properties Modeling Properties and click the Merge 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.

Continuity

The continuity of the merged surface at the boundary where the original surfaces meet:

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

Seam

The location of the seam between the two surfaces:

Modify Tangent

The surfaces whose tangents are adjusted to maintain the continuity:

These parameters affect the blending between the two surfaces.

Range	Affects the position where blending begins on the corresponding surface.
Tangent Scale Factor	Affects the extent of the influence of the surface on the blend.