S = solid.polyhedron (M) returns the solid.Shape enclosed by the triangles of the polymesh.Mesh M. The solid takes part in booleans as any other, so a scanned or downloaded part can be cut, joined and measured. This is OpenSCAD’s polyhedron. Vertices and faces in any other form, such as the struct isosurface returns, become a mesh first through the polymesh.Mesh constructor.

The mesh must be closed, every edge shared by exactly two triangles, or it is an error that says how many edges are not. Points that are equal are one vertex, and a triangle with no area is left out. The triangles need not be turned the same way: each is turned to agree with its neighbours, and each closed piece of the mesh outwards. A piece lying inside another and turned inwards, against it, is a void in it. Pieces that overlap are united, as by union, and pieces apart are separate solids of one shape, counted by solid.Shape.numsolids.

By default, triangles that lie in one plane and meet are merged into one face, so a box meshed with twelve triangles has six faces. With 'Merge' set to false every triangle stays a face.

 ## A tetrahedron with a corner cut away
 V = [0, 0, 0; 10, 0, 0; 0, 10, 0; 0, 0, 10];
 F = [1, 3, 2; 1, 2, 4; 2, 3, 4; 3, 1, 4];
 S = subtract (solid.polyhedron (polymesh.Mesh (V, F)), solid.sphere (3));

See also: polymesh.Mesh, polymesh.read, solid.read, solid.Shape

Source Code: solid.polyhedron