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Mixed Curve

In one sentence: Builds a 3-D curve as the intersection of two curves projected from different directions — plan and elevation views define the 3-D path.

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: Curves → Mixed Curve
Command: mixed_curve

Given two curves projected from different directions (typically front-view and side-view of a desired 3-D curve), the tool computes the 3-D curve at their intersection. Classic technique used in ship-hull and aircraft-fuselage design.

Step-by-step

  1. Create two curves from different projection directions (e.g. a front-view outline and a side-view outline).
  2. Select both objects.
  3. Choose Curves → Mixed Curve.
  4. The 3-D intersection curve appears.

See also