ModelBasepoint

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The ModelBasepoint command sets a base point in a model that is used for importing or inserting the model into another.

The model base point is set to a corner of the box in model A.

When model A is imported into model B, the box corner is located at the world origin.

The model base point in any model is world 0,0,0 by default.
The model base point has no effect in the current model. It is a reference point only used when the model is imported or inserted into another Rhino model.
The Export and ExportWithOrigin commands use the current model as a template to export objects. The model base point can be seen as a document setting that will be exported just like Model Units and Grid settings.

See also