Autodesk Design Suite 3D - Planix Home Design Suite 3D Wartungshandbuch Seite 149

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Working with AutoCAD Land Development Desktop Drawing Tools to Create Lines and Curves
143
Drawing Spiral Curves
Spiral curves are often used in roadway design to achieve more gradual
transitions. Instead of having a constant rate of curvature like an arc,
the spiral’s curvature is adjusted throughout—a more gradual
curvature at the beginning, and then increasing the curvature until
the SC (spiral-to-curve) intersection is reached.
AutoCAD Land Development Desktop supports four types of
spirals: Clothoid, Quadratic, Cosinusoidal, and Sinusoidal. Each
spiral type has a different rate of curvature, as shown in the
following illustration.
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