Transmigration operation

In Solid_modelling, Transmigration operation means that changes in a part must be propagated to changes in other parts which have a dependence on the first. Put simply it means that if I move something, other things will be affected and must also be adjusted to preserve other established relationships.

This expression came into existance when parametric modelers like SolidEdge gained acceptance. Parametric modelers generate the BREP from the CSG representation and its associations, usually in the form of LISP expressions.

Here is an example. Suppose one has two blocks of widely different sizes. An Euler boolean operation is performed, subtracting the smaller block from a corner of the bigger one, and resulting in a block with a square corner removed. Now suppose that someone colors one of the edges of the block and stores that change. If he goes back and moves the cutting block so that instead of cutting a side, he instead cuts in the center of the edge, creating a two edges, and reapplies those latter changes (colors). Those subsequent changes are associated with the entire two broken edges, rather than one of the cut edges.

NB: This may not be the precise nomenclature used by Pro/Engineer and SolidWorks.

See also Dataflow

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