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Blend Surface

In one sentence: Creates a surface that smoothly connects two edges with a controlled continuity (G0, G1, or G2) at each boundary edge.

Third-party addon — installation required

The Curves workbench is not included in FreeCAD. Install it via Tools → Addon Manager → search "Curves" → Install and restart FreeCAD.

Overview

Workbench: Curves
Menu: Surfaces → Blend Surface
Command: Curves_BlendSurf2

The blend surface fills the gap between two adjacent faces, matching tangency or curvature at each boundary.

Continuity options

Continuity Condition imposed
G0 Surface passes through the edge (position only)
G1 Surface is tangent to the adjacent face at the edge
G2 Surface matches the curvature of the adjacent face at the edge

Step-by-step

  1. Select the two boundary edges (with their owner faces to define the continuity reference).
  2. Choose Surfaces → Blend Surface.
  3. Set continuity at each end in the task panel.

See also