Editing Surfaces

After building primary surfaces, the next task is to refine.

	Surface Edit Create CurvesOnSurface Project [Rhino: Project] Create curves-on-surface from existing curves and surfaces by projecting curves onto surfaces based on the modeling view selected, an axis direction, a projection vector, or the surface normals.
	Surface Edit Create CurvesOnSurface Intersect [Rhino: Intersection] Creates a Curve-on-surface at the intersection of two surfaces. The curve-on-surface can be generated on the first surface selected, or on both.
	Surface Edit Trim Trim Surface [Rhino: Trim] Trims or splits surfaces based on the position of the trim locator which can be used to define either the discard or kept surface. Clicking Divide keeps both parts of the surface. Multiple surfaces can be trimmed while in the tool by using the SHIFT key to select new surfaces.
	Surface Edit Trim Untrim [Rhino: Untrim] Restores the trimmed part of a surface. There are two options: undo the last trim operation, or undo all trims on a surface or a group of surfaces.
	Surface Edit Rebuild Surface [Rhino: Rebuild, MakeUniform, Smooth, FitSrf and ChangeDegree] Allows you to simplify or modify a surface while preserving its shape.
	Object Edit Align Align [Rhino: Match] Aligns the endpoints/edges of curves and/or surfaces, or interior isoparametric curves.
	Object Edit Attach Detach [Rhino:Split] Separates a curve or surface into two or more objects at any point.
	Object Edit Insert [Rhino: no equivalent] Adds an edit point to a curve, or an isoparametric curve to a surface. Use to gain control over the shape definition of a surface. This is especially useful in Direct Modeling. Insert displays the new CV distribution to help place new isoparms interactively (CVs/hulls must be turned on to use this feature).
	Object Edit Extend [Rhino: ExtendSrf] Extends a curve or surface beyond its current endpoint or edge by adding new geometry. A precise extend value can be entered in the Prompt Line. Surfaces can be extended, or generate a new surface from the original surface edge. Trimmed surfaces need to be un-trimmed before Extend can work.
	Surface Edit Stitch Shell Stitch [Rhino: Join & CreateSolid are similar tools] Creates a special object called a shell from a group of surfaces, in preparation for export to a CAD package or STL (see Export to CAD & STL). To avoid any data loss or deformation, work with the original data in Alias; save the file, and in a new copy, stitch the data required for CAD or STL export.
	Surface Edit Stitch Shell Unstitch [Rhino: Explode (similar)] Converts a shell object back to normal surfaces. Stitching and unstitching Alias data de-natures the original NURBS data. To avoid any data loss or deformation, always work with the original NURBS data in Alias, and use the stitched models (shells) for CAD or STL export only.