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When it comes to doubly curved surfaces in construction, especially shell structures, the skew ruled surfaces play a prominent role, because they are statically efficient and relatively easy to produce [1]. However, in order to fully exploit the design potential of this class of surfaces, conventional CAD programs do not provide adequate tools. From the priority program 1542 by the German Research Foundation (DFG) named Concrete light, an add-on is presented [2] that facilitates parametric design with ruled surfaces on the basis of line geometry and also enables a connection to finite element methods.
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