Module: Mittsu::MeshAnalysis::Analysis

Included in:
Object3D
Defined in:
lib/mittsu/mesh_analysis/analysis.rb

Instance Method Summary collapse

Instance Method Details

#manifold? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mittsu/mesh_analysis/analysis.rb', line 24

def manifold?
  # Shortcut if there is nothing here
  return true if geometry.nil? && children.empty?
  # Recurse children to see if they are manifold
  children_are_manifold = children.map { |x| x.manifold? }.all?
  # Detect manifold geometry in this object
  edges = {}
  # For each face, record its edges in the edge hash
  geometry&.faces&.each do |face|
    update_edge_hash face.a, face.b, edges
    update_edge_hash face.b, face.c, edges
    update_edge_hash face.c, face.a, edges
  end
  # If there's anything left in the edge hash, then either
  # we have holes, or we have badly oriented faces
  edges.empty? && children_are_manifold
end

#solid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mittsu/mesh_analysis/analysis.rb', line 2

def solid?
  # Shortcut if there is nothing here
  return true if geometry.nil? && children.empty?
  # Recurse children to see if they are solid
  children_are_solid = children.map { |x| x.solid? }.all?
  solid = true
  if geometry
    # Make sure material is double sided
    prev_side = material.side
    material.side = Mittsu::DoubleSide
    # Make a raycaster from a vertex and the face normal
    face = geometry.faces.first
    r = Mittsu::Raycaster.new(geometry.vertices[face.b], face.normal, 1e-9)
    intersections = r.intersect_object(self, true)
    # Restore material
    material.side = prev_side
    # We want an even number of intersections
    solid = (intersections.length % 2 == 0)
  end
  solid && children_are_solid
end