/* * LoopUnfold attempts to add as many FlatFaces to a FlatBody as it can. If interference checking is off, it will add all of the * faces of the body. (Actually, the shell, as we do not handle voids). We expect for the seed face of the FlatBody to already * be created, so we have some FlatFins from which to propogate. * * If interference checking is on, multiple flat bodies are required to avoid collisions. Therefore * we return the list of FlatFins on the completed FlatBody that need to start as the seeds for additional FlatBodies. By returning * the FlatFins on the base, rather than just the faces, we can easily transfrom the adjacent FlatFace to line up with that FlatFin * by making it the seed face for the next FlatBody. */ // TBD add tab code would go here, created extra flatfaces, but we need to consider the tabs as part of the collision detection??? private List <FlatFin> LoopUnfold(FlatBody flatBody) { Debug.Assert(flatBody.FlatFaces.Count > 0); // should only be one, but more is harmless if we optimize with seeds of several flatfaces List <FlatFin> remainingFins = new List <FlatFin>(); while (flatBody.OpenFins.Count > 0) { if (AddInHelper.IsEscDown) { break; } FlatFace testFace = null; List <FlatFin> interferingFins = new List <FlatFin>(); foreach (FlatFin baseFin in flatBody.OpenFins) // OpenFins sorts itself to present the most desirable edge (the longest) { testFace = new FlatFace(baseFin.FlatFace.SourceFace.GetAdjacentFace(baseFin.SourceFin.Edge), flatBody); baseFin.AdjacentFin = baseFin.OtherFlatFin(testFace); // make symmetric? Careful: FlatFace.Render() relies on the assumption it is not testFace.Transform = Matrix.CreateMapping(AddInHelper.CreateFrame(baseFin.Start, (baseFin.End - baseFin.Start).Direction, -Direction.DirZ)) * Matrix.CreateMapping(AddInHelper.CreateFrame(baseFin.AdjacentFin.SourceEnd, (baseFin.AdjacentFin.SourceStart - baseFin.AdjacentFin.SourceEnd).Direction, baseFin.AdjacentFin.FlatFace.SourcePlane.Frame.DirZ)).Inverse; if (isDetectingCollisions && flatBody.FaceInterferes(testFace)) // FaceInterferes only gets called if isDetectingCollisions == True { interferingFins.Add(baseFin); } else { flatBody.AddFace(testFace); baseFin.IsInternal = true; baseFin.AdjacentFin.IsInternal = true; break; } } foreach (FlatFin baseFin in interferingFins) { flatBody.OpenFins.Remove(baseFin); remainingFins.Add(baseFin); } } return(remainingFins); }