Class UnionDto<T> (Inputs.OCCT)

The shapes to fuse, in order; the pieces of a compound are fused as separate shapes.

When false, faces that end up on one surface are merged and their seams removed; when true every edge of the inputs stays.

One shape per step suits any; in groups is faster for shapes apart but numbers faces differently; all at once is fastest but wrong where shapes touch at a point.