How to Make a Continuous Surface in Rhino

Surfaces

Plane	Creates a 2D surface. Default is a rectangular plane with two corner endpoints. You can change this in the options.
ExtrudeCrv (Input Distance) (Direction | BothSides | Solid)	Extrudes all selected curves. Can select to extrude in the World/CPlane XYZ direction or a manually drawn direction (D). In Rhino 6, extruding with the Gumball is a shortcut with limited direction. Simplest way to make a surface from a single curve.
EdgeSrf	Uses 3-4 curves to build a surface (a polyline counts as one curve). The resulting surface has control points at the intersection points of those base curves. Be careful: the resulting surface may be warped. For a completely flat surface, use PlanarSrf.
PlanarSrf	Uses joined, closed curves to build a planar surface(s). The resulting surface always has 4 control points laid out in a rectangle framing the surface, making it difficult to rebuild using control points. This command only works when the generating curves are planar. Useful for quickly building flat surfaces from closed topo-lines to simulate a stack of MDF/chipboard
NetworkSrf	Creates a surface from at least 4 curves that span 2 different directions. For instance, you must have a set of curves that go in x-direction and a set that go in the y-direction. This command is more precise than Loft, Sweep, or EdgeSrf.
Loft	Lofts a continuous surface through curves selected in sequence (like an extrusion built from multiple curves). You can choose how closely you want the resulting loft to fit your curves by selecting Normal, Loose, or Tight . ** The order in which you select the curves matter! Also, make sure to select the curves towards the same end. For example, if you have a series of curves facing you, select all the curves towards either their left or right ends. This prevents the surface from flipping and twisting weirdly halfway through your loft.
Sweep1; Sweep2	Creates a surface along a rail (can be a curve or surface edge) using a cross section. Sweep1 requires a selection of a guiding rail and a cross section; Sweep2 requires a selection of 2 rails and a cross section. Sweep is more precise than Loft.
MergeSrf	Merges 2 surfaces at untrimmed shared edges (they must have a shared edge!). Results in a single surface that cannot be exploded back into its original parts.
MatchSrf	Creates a smooth transition between nearby surfaces. Best when used on surfaces that are touching each other.
BlendSrf	Fills in the gap between 2 surfaces with a smooth transition. (e.g. two pipes with aligned openings, one 3' and one 2'. This command will combine the pipes and fill in the gap with a smooth transition from 3' to 2' radius.)
UnrollSrf	Unrolls a 3D object into a flat surface. Useful for laser-cutting or physical model assembly. ** If the surface is too curved, a warning may pop up about the unrolled surface. You can proceed with the command: Rhino will report any differences of area between the unrolled and original surface, and you can then determine whether or not to accept the unrolled surface.
DupEdge	Duplicates a surface edge into a curve. Good for creating new objects based on existing geometries.
MoveEdge	Moves a polysurface edge and rebuilds that surface. Useful in editing a polysurface without needing to trim or re-build the surface from scratch.
MoveFace	Moves a polysurface face and rebuilds that object. Useful in editing an object with faces without needing to trim or re-building from scratch.
MergeAllFaces	Combines all coplanar polysurface faces that share at least one edge into one surface. The resultant polysurface cannot be exploded, unlike joined polysurfaces.
Patch	Builds an approximate surface from topographic lines. Useful for creating landscape. You can specify stiffness : a higher stiffness will make the surface stiffer and follow the topographic lines less. A lower stiffness will make the surface bendier, but may result in weird dips and bumps between topographic lines. To resolve this, try different stiffnesses or build more lines.
ShrinkTrimmedSrf	A trimmed surface retains the original control points of the untrimmed surface so that it may later be untrimmed. If you know you will not be untrimming this surface, use this command to shrink control points to fit the trimmed surface. This allows you to more easily align the Gumball and fix mapping results (mapping will project to untrimmed surfaces). ** There is no visible change in the surface, only in the underlying untrimmed surface.
Section	The command will prompt you to specify cutting planes through selected objects. Each cutting plane is specified using only two points, since all the cutting planes are perpendicular to the CPlane. The command will then create curves or points resulting from the intersection of the cutting plane and the selected objects

ExtrudeCrv vs Sweep1 vs Loft

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solids (Closed surfaces)

NOTE: Rhino's version of "solids" are in the form of closed surfaces/polysurfaces, which are objects that are fully enclosed on all sides by surfaces.

OffsetSrf	Offsets surfaces. Useful in adding thickness to selected surfaces. ** Make sure to select the "Solid" option if you want to create a solid with the original surface and the offset surface.
Cap	Caps open polysurfaces. If it fails, use ShowAllEdges to find the unjoined edges where the polysurface is not joined together.
Boolean2Objects	The umbrella command for all of the Boolean commands (see below). Selecting this cycles through all options. Note that Booleaned objects cannot be untrimmed or exploded.
BooleanDifference	Subtracts the volume of one set of objects from another. Click to rotate through all subtraction options.
BooleanIntersection	Creates a new solid from two selected solids' intersected volumes. Click to rotate through all intersection options.
BooleanSplit	Splits and closes solids at intersection of selected volumes. Click to rotate through all intersection options.
BooleanUnion	Combines the volumes of one or more objects.
Pipe	Creates a closed pipe around a curve of entered radii at selected points along the curve. Rhino will build radius changes smoothly.
CutPlane	First, select the objects you want to cut. CutPlane will then create a plane normal to the CPlane that intersects all the objects.
Contour	Creates a series of equally-spaced section lines through an object. Need to define the direction in which the sections are created. Useful in creating topographic lines on a surface and creating stacked topo physical models.
Section	Define cutting planes through selected objects. Section creates curves or points resulting from the intersection of the cutting plane and the objects.
AreaCentroid	Will place a point at the area centroid of the selected object. Useful in determining a central reference point.

Examples of Boolean commands

bondcommothe1982.blogspot.com

Source: https://pennarchtank.wordpress.com/2020/04/12/rhino-3d-construction-surfaces-and-solids/

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