How the SolidDesigner Surfacing commands are working (SD Version 6) ?

- Edges

- Points

- Surfaces

- Trimming lines (Edges on Surfaces used for trimming)

- Faces (Surfaces trimmed by Trimming lines)

__What kind of meshes does Skin allow?__

Basically only chess board like meshes are allowed.
This meshes can be closed (cylinder like, torus like)
It is allowed that boundary curves degenerate to a point

- If one boundary curve degenerates, we have some kind
of "triangular surface"

- If two opposite boundary curves degenerate, we have
some kind of "banana surface"

__What is the basic difference between InsertFace and Skin?__

InsertFace only allows boundary curves (no inner profiles)
InsertFace allows from 2 up to 6 boundary curves (with the exception of
planar profles).
Skin allows 'infinite' number of edges
InsertFace allows faces beeing generated from two edges not forming a closed
loop.

- i.e. Insert will add the missing edges as straight lines
and generate the closed loop.
The resulting faces generated by "SKIN" require less amount of data than
those generated

by "InsertFace"

__How can I guarantee smoothness to adjacent faces in the skin operation? __

The resulting surface will be smoothly connected to a neighboring face

(i.e. the angle between the faces is smaller than 1 degree (see VDA
Recommendation 4955))
if all curves at the vertices are connected in a tangent way

(see picture 1, yellow edges at all four vertices)
if all inner curves of the mesh (when skinning) have a tangent continuation

on the neigbored face. (picture 2, red curve). For
a violation see picture 3

picture 1 | picture 2 | picture 3 |

**REMARK: **In many cases the neighboring face is generated by Skin
as well. So you might have either some 2D or 3D curve, which generates
the common boundary. In this cases if you want to achieve smoothness you
may not select this origianl 2D or 3D curve, but you **MUST** select
the edge of the neighboring face. To guarantee the correct selection you
can remove the 2D or 3D curve from the drawlist and select the boundary
edge of the neighboring face. (Only by selecting the edge of the neighboring
face SolidDesigner knows about the neighboring face.)

** What is the basic difference between Cap and
InsertFace? **
Cap allows and will always create a smoothed vertex
InsertFace can not have a smoothed vertex (no face-internal capping point)

** What is the basic difference between Cap and Modify Node? **
Cap will not modify the generating mesh of the surface
Modify Node will always modify the generating mesh of the surface
Cap requires a part / solid, it can't be applied to FaceParts
Modify Node works always with surfaces (of a solid/part or a FacePart)

Note: This could cause difficulties if trimmed surfaces are modified,

i.e. if BLEND faces have been applied to the original part.

** What is the basic difference between Skin and Loft? **
Loft always creates a complex

(if used to add a missing face of a closed shell, this will be converted to a solid part) Skin is more laborious then Loft

__How can I use the Mesh command in the 3D curves menu? __

To extract the mesh (that generating the surface) from a surface.

This is can be useful to modify the surface or to see how this surface
was build.