Move Vertices to Whole Number Coords?

Jim

I'm just playing around trying to move all vertices to the nearest rounded whole-number positions. For example, a vertex at (1.2, 5.5, 9.1) would be moved to (1, 6, 9).

Here's the code I have, but it doesn't seem to work very well. The vertices move but seem to bounce back and forth rather than landing on the target position.

I am using a model with a single edge for my test. Can anyone see a problem, or explain why SU is having trouble with this?

Note, if I run the code 30-40 times, the vertices eventually end up positioned on integer coordinates, so I am not sure why this doesn't work on the first run.


model = Sketchup.active_model
sel   = model.selection
ents  = model.entities
verts = Set.new
vecs  = []
edges = ents.grep(Sketchup;;Edge)

edges.each do |edge|
  edge.vertices.each do |vertex|
    if not verts.include?(vertex)
      verts.insert(vertex)
      target_position = vertex.position.to_a.map{|e| e.round }
      vec = vertex.position.vector_to(target_position)
      vecs.push(vec)
      # cpoint for visual aid
      cp = vertex.position.offset(vec)
      ents.add_cpoint(cp)
    end
  end
end

ents.transform_by_vectors(s.to_a, vecs)

Dan Rathbun

My 1st advice.. do not use the SketchUp API's Set class (because it's a thin wrapper around a C++ collection,) and you cannot be sure of the order of it's elements, especially if you will be sync'ing to another Ruby-side collection such as an Array.

If you want to sync... use a Hash, whose keys are the vertex objects, and whose values are the offset vectors.

Jim

@dan rathbun said:

My 1st advice.. do not use the SketchUp API's Set class (because it's a thin wrapper around a C++ collection,) and you cannot be sure of the order of it's elements, especially if you will be sync'ing to another Ruby-side collection such as an Array.

Yeah, that seemed to be the problem - Sets are not ordered. Thanks Dan.