Midsurfaces can be extracted for sheet metal stampings, molded plastic parts with
ribs, and other parts that have thickness clearly smaller than width and length.
During midsurface extraction, the original geometry that you select to extract the
midsurface from remains unchanged, and the new geometry that represents the
midsurface is created. The (variable) thickness of each middle surface is calculated
and stored with the surface definition.
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From the Geom page, select the midsurface panel.
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Select auto midsurface.
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Select the auto extraction subpanel.
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Using the selector, select surfaces or solids to extract the midsurface
from.
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Define all of the midsurface extraction options accordingly.
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Click extract.
A midsurface representation of a solid part or a finite element shell
representation of solid geometry is generated and organized in a new component
collector called Middle Surface, or in the current component, depending on your
choice.
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Review and modify the midsurface as needed.