message: demo: Move threshold to be a parameter of simplify(Sloppy)
  This makes it easier to experiment with different simplification
  factors.
diff: @@ -357,13 +357,12 @@ void packMesh(std::vector<PackedVertexOct>& pv, const std::vector<Vertex>& verti
  }
  }
  -void simplify(const Mesh& mesh)
  +void simplify(const Mesh& mesh, float threshold = 0.2f)
  {
  Mesh lod;
  double start = timestamp();
  - float threshold = 0.2f;
  size_t target_index_count = size_t(mesh.indices.size() * threshold);
  float target_error = 1e-3f;
  @@ -380,13 +379,12 @@ void simplify(const Mesh& mesh)
  int(mesh.indices.size() / 3), int(lod.indices.size() / 3), (end - start) * 1000);
  }
  -void simplifySloppy(const Mesh& mesh)
  +void simplifySloppy(const Mesh& mesh, float threshold = 0.2f)
  {
  Mesh lod;
  double start = timestamp();
  - float threshold = 0.2f;
  size_t target_index_count = size_t(mesh.indices.size() * threshold);
  lod.indices.resize(mesh.indices.size());
  