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Modeling strategy of freeforms on the basis of qualitative analysis

Free form surface modeling is one of the most advanced procedures of creating digital models in CAD. Use of free surface for creating solid models has become increasingly relevant in terms of technological possibilities of production in the subsequent phases of the product lifecycle. Multi-axis computer-controlled machines are standard even in small workshops and rapid prototyping is undergoing progressive development and deployment of industry. Initial geometry is a system of free curves in space. Free-form surfaces are reference geometry for shape complex solid objects. Applicability of free formed bodies for implementing subsequent manufacturing processes depends on the consistency of surfaces enveloping model. Using exact quantitative analysis of the free-form surface is difficult and inappropriate. The presented paper describes analysis methods of initial free curves and subsequent free areas in order to identify and assess the consistency and smoothness of the surface for the use the model in the subsequent phases of the product lifecycle.