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Tunnel


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Solid subtraction is fine.

Another way is to extrude the shape. Draw a cross section of the tunnel as a 2d polylne and extrude that.

Lofts also work, esp for a tunnel with varying cross section. Draw each cross section as a NURBS curve or a 2d poly then convert it to NURBS. Arrange them in top view like ribs on a boat hull. Then simple loft along the ribs.

-B

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