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<p>A variational model is a computer representation of a variational class and stands for a collection of different instances of the part or assembly modeled in CAD. The different basic approaches to variational modeling are reviewed. A surface-based approach to variational modeling is discussed. The approach is applied to solving the problems of eliminating rigid-body motion, handling incidence and tangency constraints, and modeling form variations. The application of variational modeling to automated tolerance analysis is also discussed.</p>

S. Gupta and J. U. Turner, "Variational Solid Modeling for Tolerance Analysis," in IEEE Computer Graphics and Applications, vol. 13, no. , pp. 64-74, 1993.
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