It is possible to define geometric primitives (solids) as a restriction of the node displacements. Geometric primitives are defined using the SOLID parameter. The SOLID parameter allows for the definition of circles, circle segments, ring segments, and rectangles in two-dimensional models and cylinders, cylinder segments, tubes, cubes, cube segments in three-dimensional models. There is a differentiation between a variation solid and a restriction solid (variation area or restriction area). The parameter:
specifies a solid whose borders might not be penetrated. The solid must
be defined with a
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