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Reflect Lines

In one sentence: Highlights reflection lines — curves where a parallel light source is specularly reflected toward the viewer — which are more sensitive than zebra stripes for detecting G2 discontinuities.

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 → Reflect Lines
Command: ReflectLines

Reflection lines update when the view rotates. They reveal subtle G2 discontinuities that zebra stripes might miss, because a tangent discontinuity creates a clear kink in reflection lines.

Step-by-step

  1. Select a face or shell.
  2. Choose Surfaces → Reflect Lines.
  3. Reflection lines are computed for the current view direction.
  4. Rotate the view to see how the lines behave across the surface.

See also