unfold

[engrenage]

a tad simpler:

Code:

faceX_clicked() // event-based I suppose?

is it connected to two or more faces present in the tree?
{
   // connect where?
   request from user: FACE = select_face()
   if FACE not in unfold_tree: try again (or make new group)
} else is it connected to another face present in unfold_tree? {
    FACE = that face (in the tree) it is connected to
} else {
   make new group (set label and color, else random)
   return
}

what edge connects the two faces? add this edge and its position to fold_list, mark it as a fold in the output.

add faceX to unfold_tree and compute its position ; output can be generated on-the-fly for all edges of faceX that are not part of fold_list

update face color and edge colors in the 3D model view ; color faces by first-level branch (group) and edges by unset/cut/fold

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note: ideally, the angle of each fold should be included in an "assembly instructions" file, while the output file only contains the cuts.

output outline must be a single continuous path.