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Right-click in the Graphics window to open up The Graphics Context Menu and select Union (
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Choose Entire geometry (default) to unite all available entities.
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Select Domain to unite domains. Only unmeshed domains can be selected.
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Select Boundary to unite boundaries.
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Choose Edge to unite isolated edges.
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Select Mixed dimensions to specify a mixture of entities to unite. Click the Activate Selection
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The Union operation can be used to clean up a mesh of very bad quality even if nothing needs to be united. It can, for example, be useful for a mesh imported from a Filter dataset.
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