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Default UI Menu: Constraints/Coincident

Ribbon UI Menu:

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Makes a vertex lie on another vertex, or on another object.

  1. Start with two lines. Activate the Coincident constraint and select the vertex you want to constrain.

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  1. Select the line which you want the vertex to lie on.

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The vertex moves to the line, or to a point on the line's theoretical extension.

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If you constrain the vertex to another vertex . . .

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. . . the two vertices will meet.

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  1. This constraint is similar when using arcs and circles. Start with a line and a circle, and constrain the line endpoint to the arc endpoint.

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The endpoints now meet.

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  1. If you constrain the vertex to the arc itself . . .

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. . . the line joins the arc at the tangent point.

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