Conics are degree 2.Ĭonic sections: Image from A. Rhino commands allow drawing specific conics or the general Conic command allows free-form drawing of conic curves. Depending on whether the angle is less than, equal to, or greater than 90 degrees, we get ellipse, parabola, or hyperbola. Conic-section curvesĬonic-section curves were first defined as the intersection of: a right circular cone of varying vertex angle a plane perpendicular to an element of the cone. See: Wikipedia: Non-uniform rational B-spline. Rhino offers a variety of methods for creating free-form curves.ĭraw a curve from control point locations.ĭraw chained Bézier curves with editing handles.įit a curve through locations on a surface. A NURBS curve is defined by its order, a set of weighted control points, and a knot vector. A polyline is a series of line or arc segments joined together.įit a line through any combination of points, control points, and point-cloud objects.ĭraw a multi-segment polyline with options for line and arc segments, tracking line helpers, and close.ĭraw a polygon with a specified number of sides with options for inscribed/circumscribed, by edge, star-shaped, around a curve, and vertical.ĭraw a rectangular closed polyline from with options for starting at the center, three points, vertical, and rounded with arc or conic corners.įree-form curves in Rhino are NURBS curves. Lines and polylinesĪ lines is a degree 1 curve with no bends. You can also draw curves using curve control points and draw curves that pass through selected points. You can draw straight lines, polylines that consist of connected line segments, arcs, circles, polygons, ellipses, helices, and spirals. Rhino provides many tools for drawing curves. It can be straight or wiggled, and can be open or closed.Ī polycurve is several curve segments joined together end to end. Drawing lines and curves | Rhino 3-D modeling Drawing lines and curvesĪ Rhino curve is similar to a piece of wire.
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