You can create a midsurface from a set of faces (or extract features) and an offset. This is useful for complex models which may not contain parallel faces to form a pair.
The created midsurface is automatically extrapolated and re-limited to the selected support.
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In the Support box, select a solid feature, volume feature or a body.
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In the Creation Mode list, select Faces to Offset.
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In the Faces To Offset box, select either the faces to offset or the extract features.
- Face selection: Select one or more faces in the work area.
- Extract feature selection: Perform one of the following actions from the context menu:
- Select . The Extract Definition dialog box appears. For more information, refer to Extracting Elements.
- Select . Then, select one or more faces in the work area.
- Select . For more information, refer to Extracting Sub-Elements.
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In the Computation Mode list, select Manual.
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Click Compute Offset
beside the Offset box.
- Offset faces from the selected faces are detected.
- Minimum and maximum offset values are computed and displayed in the work area with the Min and Max indicators.

- Average offset value is computed and displayed in the Offset box.
- Optional:
Click Min or Max indicator in the work area to evaluate the offset parameter.
The value in the Offset box is refreshed accordingly.
- Optional:
Right-click Min or Max indicator in the work area and select Remove Min or Remove Max, respectively from the context menu.
The
Min or
Max indicators are removed from the current face. They re-appear on the next sequential face with the recomputed
Min or
Max value.
Note:
The indicators do not appear after they are removed from the last face.
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In the Offset ratio box, type the offset value or use the arrows to change the value.
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Click OK.

The midsurface is generated.