Use the INSERT_ROW operation to insert a row of control points of a surface.

Click the icon and then click on any control point in one of the orthogonal projection views. A row of control points will be inserted after the row corresponding to the clicked point.

The control points in the new row will be inserted at coordinates linearly interpolated from the control points on rows immediately before and immediately after the new row. For this reason, inserting a new row after the last row is not permitted.

Switch between orthogonal projection views and continue inserting.

Click the icon again to disable the INSERT_ROW mode.

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