Function AddPointToAllEdges

editor/HRoom.cpp:901–907

Adds a new point to all instances of a given edge First adds the point to the room (or finds it there), then calls AddVertToAllEdges()

// Adds a new point to all instances of a given edge
// First adds the point to the room (or finds it there), then calls AddVertToAllEdges()
void AddPointToAllEdges(room *rp, int v0, int v1, vector *new_v) {
  int newvertnum = RoomAddVertices(rp, 1);

  rp->verts[newvertnum] = *new_v;

  AddVertToAllEdges(rp, v0, v1, newvertnum);
}

// Clips a face against another.  Produces one polygon that is the intersection of the two input
// faces, and zero or more extra polygons, which are parts of the input face outside the clipping face.