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A tick mark centered on a point that sits on a line or circle - a short segment on a line, a short arc on a circle.

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• Anchor (point): the basis point on the host where the mark is centered.
• Host (any): the line or circle the mark rides.
• Length (number, editable): the whole mark's length.

• Tick (curve): the mark:
  • on a line host, a short segment along the line's direction, centered on the anchor;
  • on a circle host, a short arc of that circle centered on the anchor's angle (its angular half-span is Length / 2 / radius).

Draws a small mark across a point on a line or circle, the kind you would make with a compass and straightedge to show where something was struck. It is annotation, not construction: nothing is built from it.

The mark follows its host. On a line it comes out as a short segment along the line, on a circle as a short arc of that circle, so it always sits flush rather than crossing at an angle.

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• In the modeling view: the tick marks made with Straightedge and Compass.
• Convert to Nodes emits this for a converted tick; Length comes out as an outside Slider: the same size the arrow keys nudge on the canvas.