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Skins

Definition

Skins are sets of Sides. A Skin can be open or close.

skin = skinset.add( Skin(number, [side1, side2, side3, ...]) )

where

`number`	number of the `Skin`
`side1`, `side2`, `side3`	`Sides` which constitute the `Skin`

Skin can be replaced by MultiProjSkin (derived class). MultiProjWire can handle multiple projections when the normal is not continuous
The function skinset.add can take up to ten Skins in argument. If only one is supplied, the function add returns a reference pointing towards this skin. If more than one are supplied, no reference is returned.
If the Skin is to be meshed by the transfinite mesher 3D Meshers (Volumes)), the order of the faces that define it matters.