A history-based modeler seems to define the “design intent” with the constraints and relationships imposed on the design. Partially at issue is that the concept of “design intent” seems to be defined differently in the two approaches. A table is no more a table a bearing is no more a bearing, etc." As a result, practically any editing operation unrecognizably changes the original model, “alienating” it from the design intent. The reason is that by simplifying model editing operations such models leave too may degrees of freedom to the users. "CAD-systems based on direct, or explicit, or dynamic modeling have not replaced history-based design. The heart of the debate is neatly summed in an excerpt from a recently published whitepaper called Variational Direct Modeling: How to Keep Design Intent in History-Free CAD by Dmitry Ushakov of Ledas Ltd. Questions about the merits of direct over history-based modelers, and vice versa, still persist in numerous blogs and social networking sites.
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