Surface Edit > Trim > Trim Convert

Trims a surface and converts a four-sided trimmed surface into an untrimmed (natural) surface.

Trim Convert Settings

3D Trimming: If this box is checked, you can select curves to project onto the surface while within the tool. If it is unchecked (default), this capability is removed.
Project Normal: If this box is checked, the curve is projected onto each point on the surface along the normal at that point. If unchecked (default), the curve is projected along the view vector (in both the orthographic and perspective windows).

This option is only available if 3D Trimming is turned on.
U Degree, V Degree: The degree of the new untrimmed surface in the U and V directions.
U Spans, V Spans: The number of spans of the new untrimmed surface in the U and V directions.
Switch U/V: Turn on this option to change the orientation of the U and V axes on the new trim converted surface.
Show Surface Deviation: Displays the maximum deviation between the original trimmed surface and the new untrimmed surface.
Show Edge Deviations: Displays the maximum deviation between each edge of the original trimmed surface and the new untrimmed surface.
Keep Originals: Keep the original trimmed surface after creating the new untrimmed surface.
Auto Recalc: Automatically updates the surface when you adjust the Trim Convert Settings.

Display Options

Show Intersections: If this box is checked, green locators indicate the intersections between the trim curves, and between the trim curves and trim surfaces. Red locators indicate trim curve endpoints that do not intersect any other curve-on-surface or trim surface edge.
Region Selector U Size/V Size: The relative size of the trim region selectors in the U and V parametric directions on the surface. Adjust these sliders if the selectors (crosses) appear too small or too large on your model. The values range from 0.01 to 2.0.

NoteThe Shrink Surface option has been replaced by a plug-in called shrinkToTrim which can be loaded through Utilities > Plug-in Manager . shrinkToTrim shrinks the UV parameters of the underlying surface to cover only the visible (non-trimmed) parts of the surface. This functionality is useful when applying label-style textures to the surface.