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    • Maxence Reberol's avatar
      Add the setTransfiniteAutomatic feature (in API) · 0a0b8b6b
      Maxence Reberol authored
      setTransfiniteAutomatic() automatically sets the transfinite
      attribute on curves, surfaces and volumes when possible. The
      objective is to automate a task (setting transfinite) which is
      very tedious on large CAD models (hundreds of curves), and to
      help automatic quad meshers by preprocessing the trivial patches.
      The number of points on curves is automatically determined according
      to the sizing constraints (same number as when generating the vertices
      on curves). The number of points is kept coherent between adjacent
      quadrilateral surfaces by computing the topological chords where
      possible, and using the averaged values on the independent chords.
      
      Some limitations:
      - It is not possible to automatically and robustly deal with
      faces with more than 4 edges, even if we could choose 4 corners,
      as it would create T-junctions and then the automatically propagated
      constraints may become inconsistent (limit cycles). It is still
      possible to deal with a subset of these cases, but it is lot of work,
      much more than this commit.
      - In the quadrilateral faces, the angle corners are computed from the
      curve tangents but do not use the face normal, so large concave corners
      are not rejected with the current approach.
      - Currently, the points are uniformly distributed on the transfinite
      curves. It should be possible to detect existing transfinite curves
      with non-uniform distributions and propagate them.
      0a0b8b6b
  24. 20 Jul, 2020 2 commits